Choosing your first digital piano can be overwhelming. There are dozens of models that look similar on paper but feel completely different under your fingers. The Donner DEP-20 and the Casio CDP-S110 are two of the most talked-about options in the affordable 88-key category, each promising a “real piano” experience at a beginner-friendly price. But they take different routes to get there. Donner leans on sheer value — more sounds, more features, and bigger bundles for the lowest cost. Casio, on the other hand, builds its reputation on feel and reliability, focusing on a realistic key action and polished piano tone. This comparison review digs into both instruments from a real player’s perspective: how they look, play, sound, and hold up in everyday use. The goal is simple — to help you make an informed, confident choice about which piano truly fits your needs and your budget.
Donner DEP-20 vs Casio CDP-S110 Comparison Chart
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| Feature | Donner DEP-20 | Casio CDP-S110 |
|---|---|---|
 |  | |
| Check the best price on Amazon | Check the best price on Amazon | |
| Keyboard | 88 keys, fully weighted, hammer-action style | 88 keys, Scaled Hammer Action II |
| Touch Sensitivity | Adjustable (multiple curves) | 3 levels + off |
| Sound Engine | Multi-sample PCM (varied quality) | Casio AHL II (Acoustic & Highly-compressed Large-waveform) |
| Number of Tones | 238 tones | 10 tones |
| Polyphony | 128-note polyphony | 64-note polyphony |
| Speakers | 2 × 25W | 2 × 8W |
| Amplification | 50W total output | 16W total output |
| Rhythms / Accompaniments | 200 rhythms | None |
| Demo Songs | 100 | 10 |
| Effects | Reverb, Chorus (adjustable) | Reverb (adjustable), Chorus (fixed) |
| Layer/Split | Yes (layer + split modes) | Yes (layer + split modes) |
| Recording | Built-in 2-track recorder + USB-to-device recording | No internal recorder (MIDI recording available via apps/software) |
| Pedal Support | Single sustain pedal input (some bundles include 3-pedal unit) | Single sustain pedal included; supports optional 3-pedal SP-34 unit with half-pedaling |
| Connectivity | USB-to-host, USB-to-device, MIDI In/Out, Aux In, Aux Out, dual headphone jacks | USB Type-B (MIDI), dual headphone jacks |
| App Compatibility | Works with third-party apps (Flowkey, Synthesia, DAWs) | Full Chordana Play for Piano integration + DAWs |
| Power Options | AC power only | AC adapter or battery-powered (6 × AA) |
| Dimensions | Approx. 54.1 x 13.8 x 5.9 in | Approx. 52.0 x 9.1 x 3.8 in |
| Weight | 24.9 lbs (11.3 kg) | 23.1 lbs (10.5 kg) |
| Stand Included? | Depends on bundle | Stand sold separately (depending on seller) |
| Ideal For | Beginners who want features, experimentation, and volume | Beginners who want realism, simplicity, and reliable piano feel |
| My individual reviews | Donner DEP-20 review | Casio CDP-S110 review |
Design & Build Quality
When you first sit down at a digital piano, the design and build quality are the two things that speak before a single note does. They shape your first impression, your comfort during play, and even how likely you are to keep coming back to practice. In this price range, compromises are inevitable — neither the Donner DEP-20 nor the Casio CDP-S110 is built like a $2000 stage piano — but the quality of those compromises varies. One aims for a modern, stripped-down simplicity that feels more professional, while the other gives you an abundance of features in a bulkier but more inclusive package.
Let’s unpack how both instruments handle design, materials, assembly, ergonomics, and general durability, because these factors affect not just appearance but how enjoyable and reliable the instrument is day to day.
Aesthetic design and first impressions
At first glance, the Casio CDP-S110 gives off a distinctly modern, almost minimalist vibe. It’s slim, sleek, and quietly confident — the kind of piano that looks good in almost any room without drawing too much attention to itself. Casio’s designers clearly prioritized compactness, and it shows in the piano’s remarkably thin profile. This is one of the slimmest 88-key instruments in its class, coming in at roughly 232mm deep (just over 9 inches). You can easily place it on a desk, slide it under a shelf, or mount it on a lightweight stand. The clean lines, matte finish, and understated button layout convey a professional aesthetic that suggests “serious musical tool,” not “toy keyboard.”
By contrast, the Donner DEP-20 looks like the louder personality in the room. It’s chunkier, busier, and more feature-forward in design. Where Casio keeps controls discreet, Donner spreads a row of labeled buttons, a small LCD screen, and several functional shortcuts across the top panel. It looks more like a workstation keyboard than a minimalist piano. For some players, especially beginners who enjoy visual variety and lots of tactile controls, this can feel reassuring — you can see everything at a glance, and there’s a button for nearly every feature. For others, especially those seeking a more refined, acoustic-like appearance, it may feel cluttered or less elegant.
The overall footprint of the DEP-20 is larger and bulkier. That can be a plus if you want a commanding presence on a stand and don’t plan to move it often. But it does mean it’s less portable and a bit harder to fit into tight home spaces. Where the Casio feels light and modern, the Donner feels old-school and feature-packed — not worse, just different in personality.
Materials and finish
Casio has a long reputation for solid build quality in its entry-level digital pianos, and the CDP-S110 continues that tradition. The casing is made of high-grade molded plastic with a fine matte texture that resists fingerprints and minor scratches. The keybed area is neatly aligned, the buttons feel firm, and there are no creaks or loose joints when you pick it up or move it. Casio’s production consistency is excellent — if you’ve played one CDP-S110, you’ve effectively played them all. This reliability comes from decades of refined manufacturing at scale. Even small details, like the key edges and control button feedback, are executed cleanly. The piano feels solidly engineered even though it’s lightweight, and it’s obvious that the slimness didn’t come at the expense of sturdiness.
The Donner DEP-20, meanwhile, is mostly made from similar molded plastics but doesn’t feel quite as polished. That’s not to say it feels cheap — far from it, especially for the price — but the refinement isn’t at Casio’s level. The finish is smooth and glossy in places where the Casio opts for matte texture. The buttons and display work fine but can wobble slightly if pressed firmly, and some users have reported minor variations in panel fit or key alignment from one unit to another. These are the small inconsistencies that often appear in newer or lower-cost manufacturing processes.
Still, Donner deserves credit for the visual presentation. The brushed black surface and silver labeling look professional enough, and the included stand and triple pedal unit (if you get the bundle) match the keyboard’s aesthetic fairly well. For the money, the overall design looks far more expensive than it is — it’s just not quite as refined in tactile quality.
Layout and ergonomics
Casio’s minimalist design translates to an intuitive, clutter-free playing experience. The CDP-S110 uses a small number of buttons, each serving multiple functions with key combinations. It’s clean but can be a bit cryptic until you learn the shortcuts. The lack of a display means you rely on indicator lights or the Casio Music Space app for deeper control. For players who prefer a “switch on and play” simplicity, this is perfect — nothing distracts you from the keyboard itself. It feels like sitting at a stripped-down acoustic instrument, and that’s exactly the design intent.
Donner takes the opposite approach. The DEP-20’s panel is dense with buttons, numbers, and a display screen that shows tone names, rhythm numbers, and function parameters. It’s more akin to an arranger keyboard. This makes it easy to experiment with sounds and features directly on the instrument without needing a connected app or manual. The tradeoff is that it feels less like a piano and more like a multifunction keyboard. The extra weight of the controls, plus the integrated speakers’ front-facing grills, gives the Donner a bulkier, more “all-in-one” look. If you enjoy having everything under your fingertips, you’ll appreciate Donner’s design. If you prefer an uncluttered, traditional piano interface, Casio’s simplicity wins.
Size, weight, and portability
Casio’s CDP-S110 was engineered for portability. Weighing about 10.5 kg (roughly 23 lbs), it’s incredibly easy to carry. You can pack it in a soft case, throw it in a car, and take it to a gig, rehearsal, or lesson without much effort. Its slim form factor also makes it perfect for tight living spaces, dorm rooms, and apartments. Even if you never plan to move it often, its low weight makes setup and rearranging simple.
The Donner DEP-20, in contrast, is a significantly heavier instrument, typically around 12–13 kg (26–28 lbs) depending on the bundle and internal components. Add the stand and pedal board, and you’re easily at 25 kg or more. This isn’t necessarily a negative — a heavier build often feels more stable during play — but it’s clearly designed to be stationary. If you plan to leave your digital piano in one spot, the DEP-20’s larger frame won’t bother you. But if portability or frequent moving is a factor, Casio’s design is far easier to live with.
Keybed construction and visual design
Both pianos have full-size, weighted keys, but their design approaches differ subtly. Casio’s keybed has an elegant, understated look with smooth matte-finish white keys and slightly textured black keys that help prevent slipping under the fingers. The spacing and alignment are extremely consistent, which gives a premium feel even before you play a note. The overall geometry looks closer to an acoustic upright than most entry-level keyboards.
The Donner DEP-20’s keybed also spans the full 88-key range and is visually fine, though the glossy plastic finish on the white keys feels more synthetic. Key gaps and travel depth can vary slightly from unit to unit. It’s not noticeable while playing casually, but if you’re sensitive to tactile uniformity, you might spot minor inconsistencies. For beginners, it’s perfectly fine. For intermediate pianists with trained touch, Casio’s keybed simply feels more “together.”
Assembly and bundled hardware
Casio sells the CDP-S110 as a standalone keyboard or as part of a bundle with a folding X-stand, sustain pedal, and sometimes a bench. Because the piano is so lightweight, almost any stand will hold it securely. The build is solid enough to mount on Casio’s own furniture-style stand (CS-46P or CS-68 models), turning it into a semi-permanent home setup. Assembly is straightforward — the chassis is sturdy enough that you don’t need to worry about bending or warping during setup.
Donner’s DEP-20 usually ships with more hardware included right out of the box. Many packages include a full furniture stand, three-pedal system, and bench. The matching stand is made of particleboard and metal fittings — not high-end furniture, but functional and decently stable. The pedal unit is a nice touch for students practicing proper pedaling technique. However, because the Donner stand adds significant bulk and weight, assembly takes longer and stability can vary slightly depending on floor type and screw tightening. Overall, the included setup offers great value and makes the piano look more “complete,” even if the materials aren’t as premium as higher-end models.
Durability and long-term reliability
Casio’s design durability is one of its strongest points. Owners routinely keep their CDP-series pianos for many years without issues. The keys resist yellowing, the buttons rarely fail, and the plastic casing withstands normal household use and transport. Casio’s internal assembly quality ensures minimal rattles, no uneven gaps, and no surprise mechanical noises after long use. The build feels like it could survive years of lessons, student handling, and moving without much degradation.
Donner’s long-term durability is less documented, mainly because the brand is younger and its models have shorter market histories. That said, user reports generally show the DEP-20 holding up well under regular home use. Some owners note minor quirks such as buttons losing responsiveness over time or occasional key noise developing after heavy use, but for the price bracket, this is expected. Donner’s customer service reportedly replaces defective units promptly, which mitigates risk somewhat. Still, if you want absolute consistency over years of heavy playing, Casio’s proven reliability gives you peace of mind.
Everyday usability and maintenance
Casio’s matte finish makes cleaning easy — dust and fingerprints are less visible. The compact design also reduces crevices where debris can collect. Donner’s glossy accents and exposed button layout, by contrast, tend to attract fingerprints and require more frequent wiping to stay clean. Both models can be maintained with a soft cloth and compressed air for dusting. The Donner’s integrated stand (in bundled versions) adds visual polish but limits flexibility — you can’t easily reposition or tilt it for ergonomic adjustments, while Casio’s separate keyboard design allows a range of stand choices for different heights and postures.
Overall design and build verdict
The Casio CDP-S110 wins for design refinement, ergonomics, and long-term construction quality. It feels thoughtfully engineered — every element serves a purpose. Its slim, minimal build is attractive, functional, and dependable. The Donner DEP-20, meanwhile, delivers impressive perceived value: it looks like a full professional setup out of the box and includes accessories that would cost extra from Casio. It’s more flamboyant, slightly rougher around the edges, and less portable, but undeniably practical for stationary setups.
In short, Casio brings polish and precision, while Donner offers value and completeness. If you want something that feels modern, minimalist, and solid for years of playing, Casio is the smarter choice. If you want a complete, all-in-one home piano package that looks substantial and costs less upfront, Donner’s bulkier design is a fair trade-off.
Keyboard & Action
The keyboard action is where a digital piano earns or loses its credibility. It’s the main point of contact between player and instrument — the place where sound, feel, and responsiveness come together. You can forgive average speakers or limited features if the keys feel right. Conversely, even a piano with stunning tones becomes uninspiring if the key action feels off. The Donner DEP-20 and the Casio CDP-S110 take notably different approaches here, reflecting their broader philosophies. Casio focuses on realism and tactile accuracy, while Donner focuses on accessibility, weight, and value. Both give you a full 88-key range with weighted action, but the difference in how those keys respond, sound, and age over time is where the story really lies.
What “keyboard action” really means
Before comparing, it’s worth defining what action means in this context. On an acoustic piano, each key physically triggers a hammer that strikes strings, and the resistance you feel under your fingers comes from that mechanical system. A good digital piano tries to simulate this sensation through a combination of key weight, return resistance, pivot design, and digital velocity sensitivity. Some cheaper keyboards claim to be “weighted,” but that can mean anything from basic spring resistance to a scaled hammer system designed to mimic the subtle differences between bass and treble keys.
In this area, Casio’s experience as a long-established piano maker gives it an edge — they’ve spent decades refining affordable hammer mechanisms. Donner, on the other hand, is a newer player focused on offering functional full-weighted keys at the lowest possible price. Their design achieves an impressive approximation for beginners, but it lacks the nuance and mechanical precision found in Casio’s system.
Casio’s scaled hammer action
The Casio CDP-S110 uses the company’s Scaled Hammer Action Keyboard II, a development that builds on Casio’s long history in digital piano engineering. Each key has its own mechanical weighting, making the lower notes heavier to press and the higher notes lighter — just like on an acoustic grand. This scaling effect isn’t just about realism; it also trains proper hand balance. When you play with correct dynamics, your fingers adjust naturally to the changing resistance, building the right muscle memory for acoustic performance.
Casio’s hammer action is quiet, stable, and solid under the fingers. You can feel the simulated inertia of the hammer as the key goes down, followed by a controlled return. It’s not as advanced as the tri-sensor systems found in higher-end Casios or Privia models, but for this price range, it’s extremely convincing. The balance between resistance and fluidity feels refined — enough weight to build proper technique, but not so heavy that it tires beginners. There’s also a slight textured matte finish on the key surfaces that adds grip, which prevents the fingers from slipping during long sessions.
When you play softly on the CDP-S110, you get fine gradations in volume and tone; press harder, and the sound brightens naturally. The action responds predictably to every level of velocity. It’s consistent from one end of the keyboard to the other, which is something not every entry-level piano can claim. The mechanism is also durable: Casio has built a reputation for actions that don’t develop unevenness or clicking noises over time.
Donner’s full-weighted action
The Donner DEP-20 is advertised as having “full-weighted 88-key action.” In practice, that means it uses a spring-and-weight system designed to approximate the resistance of real piano keys, though not a true hammer mechanism in the same sense as Casio’s. For the price, the feel is surprisingly solid — definitely closer to a piano than to a synth. There’s tangible resistance, and the keys return at a reasonable speed. However, the weighting feels slightly less graduated across the range. In many units, the difference in heaviness between bass and treble keys is minimal, so the “scaled” aspect isn’t as pronounced.
When you press the keys, there’s a noticeable pushback, but the motion is somewhat stiffer and less refined than on Casio’s. The rebound feels a little faster and lighter, giving the impression of a semi-weighted keyboard that’s been made heavier rather than a genuine hammer action. It’s playable, responsive enough for most beginner to intermediate pieces, and perfectly fine for pop, practice, or accompaniment, but classical players or those sensitive to touch nuance might find it less inspiring over time.
Still, Donner deserves recognition for what they achieved here at this price. The DEP-20’s action is better than many sub-$400 keyboards that claim to be “weighted.” It offers enough resistance for building finger strength and control. For a new player or casual hobbyist, it feels satisfying, even if the dynamic response isn’t quite as smooth as Casio’s.
Key consistency and calibration
Casio’s precision manufacturing means each key’s resistance and return feel nearly identical. You won’t find an “odd” key that feels lighter or heavier, and there’s no side-to-side wobble. The pivot mechanism underneath is well-engineered and secure. When playing fast passages or scales, the uniformity helps maintain even dynamics and rhythm. It feels professional, even though it’s technically an entry-level board.
On the Donner, consistency varies slightly between units. Some keys may feel marginally heavier or softer depending on how they’re seated in the chassis. The side-to-side wobble is more noticeable if you play near the key edges. For most beginners, this won’t matter much, but experienced pianists might pick up on it immediately. Calibration of velocity curves (the relationship between how hard you press and how loud the note is) can also feel less linear. Soft playing sometimes triggers notes that are louder than expected, while medium dynamics might compress. It’s playable and certainly usable for practice, but it lacks the nuanced sensitivity of Casio’s velocity mapping.
Noise and tactile feedback
A good digital piano key action is not only about resistance — it’s also about noise and tactile feedback. Casio’s keys move quietly and smoothly. You can practice late at night without noticeable mechanical clatter, especially through headphones. There’s a subtle mechanical “thunk” at the bottom of each stroke, mimicking the sensation of a hammer hitting a string. It feels controlled rather than abrupt. The sound is evenly dampened across the range, giving the impression of quality engineering.
The Donner DEP-20’s keys are a bit noisier mechanically. You’ll hear a slightly hollow knock if you play with force, likely due to the lighter internal key supports and less damping material. It’s not distracting, but in very quiet environments, the mechanical noise is more noticeable. The tactile feel is less “weighted inertia” and more “spring-loaded resistance.” For practice and learning, it’s acceptable, but players sensitive to noise or key resistance will notice the difference.
Dynamic response and playability
Casio’s action pairs beautifully with its sound engine, producing seamless transitions from soft to loud dynamics. It responds predictably to how you play. Light touches yield whispering tones, and firm strikes produce bright, punchy responses. This allows expressive phrasing — essential for classical, jazz, or expressive pop. The ability to control tone with touch gives the CDP-S110 an authentic piano experience that encourages musicality.
The Donner DEP-20, while capable of dynamic expression, doesn’t translate key velocity into sound quite as organically. The dynamic curve feels narrower — soft playing may not get as quiet as you’d expect, and loud playing may reach maximum volume too soon. For fast pieces or nuanced phrasing, this limits control slightly. On the flip side, for learners or casual players who just want consistent volume without worrying about touch precision, that can actually be comforting. It’s easier to get an even sound across the keyboard, even with uneven finger pressure.
Key surface and feel under the fingers
Casio gives the S110 keys a subtle matte texture that feels refined and grippy. Even during long practice sessions, the surface doesn’t feel slippery. The key tops are resistant to sweat and smudges, maintaining a consistent feel. The black keys have a slightly rougher texture than the whites, providing tactile contrast similar to acoustic ebony keytops.
Donner’s keys, by comparison, are smoother and glossier. They look bright and clean under light, but the polished surface can feel slick when your hands get warm. The visual effect is nice — the high-gloss white looks almost grand-piano-like — but from a functional standpoint, matte finishes are easier to play on for extended sessions. It’s a small detail, but one that influences comfort and performance over time.
Speed and repetition control
Casio’s action allows for fairly quick note repetition. Because of the hammer mechanism and responsive return, you can play trills, repeated notes, or arpeggios without the action lagging. The weight balance supports both gentle legato and percussive staccato playing. While it’s not at the level of Casio’s higher-end tri-sensor systems, the CDP-S110 can handle moderately advanced repertoire without mechanical limitation.
Donner’s keys are somewhat slower to reset after deep depressions, which can slightly limit rapid repetition. The spring resistance doesn’t always return the key to its top position as quickly as a hammer mechanism does, so extremely fast passages might feel less crisp. For typical beginner or intermediate pieces, though, this isn’t a dealbreaker. Most players at this level won’t reach the repetition threshold that exposes this difference.
Long-term feel and reliability
Casio’s action is built to last. Over time, the key weight and feel remain stable, and there’s little to no degradation with normal home use. The pivot points are secure and unlikely to loosen. Many users keep Casio digital pianos for years without any noticeable change in feel.
The Donner DEP-20’s long-term reliability is more mixed. Because the design relies on simpler mechanisms, it’s more prone to developing minor inconsistencies after extended use — perhaps a slightly looser feel in some keys or more audible mechanical noise. This is normal for lower-cost weighted actions, and while not catastrophic, it reinforces that Donner’s system is aimed more at beginners or casual home users rather than long-term piano students.
Real-world experience
Play both side by side, and the difference is clear immediately. Casio’s keys feel like a piano: smooth, predictable, and expressive. Donner’s feel like a solid keyboard trying to be a piano — functional and enjoyable, but not quite immersive. For a student, the Casio encourages correct technique, finger independence, and control. The Donner encourages exploration, fun, and practice without intimidation. They’re both valid goals, but they serve different users.
If you close your eyes while playing, Casio’s action almost disappears — you’re left thinking about music, not about key mechanics. With the Donner, you’re aware of the hardware; the slight stiffness and resistance variation remind you it’s a digital simulation. That doesn’t make it bad — just less seamless.
Verdict
In terms of keyboard and action, the Casio CDP-S110 clearly leads. Its scaled hammer mechanism feels refined, natural, and expressive, giving beginners a realistic platform for growth. The Donner DEP-20 delivers a commendable imitation for its low price, but it’s more about providing “weight” than replicating true piano mechanics. For casual players or those on a tight budget, the DEP-20 feels good enough. But for anyone serious about learning proper piano technique or wanting a long-lasting, authentic feel, the Casio remains the smarter investment.
In short: Casio feels like an instrument; Donner feels like a well-built keyboard.
Sound Engine & Tone Quality
The sound engine is the soul of any digital piano. It’s what translates your finger movements into tone, emotion, and musicality. You can have the best keyboard action in the world, but if the sound doesn’t inspire you, it won’t matter much. This is where the Donner DEP-20 and the Casio CDP-S110 take noticeably different paths. Casio focuses on realism — fewer sounds, but each one carefully sampled and tuned to feel authentic. Donner, on the other hand, goes for variety — hundreds of sounds and instruments meant to spark creativity. Both have strengths and weaknesses, and both serve distinct audiences. Let’s dig deep into what each offers in terms of sound quality, tone character, realism, and overall musical experience.
The importance of the sound engine
In acoustic pianos, the sound is produced naturally through strings, hammers, and a resonant wooden body. In digital pianos, that same sound must be recreated electronically using samples or modeling. The sound engine determines how well that illusion is maintained — from how notes begin and fade to how they react to touch and how the harmonics blend when you use the sustain pedal. A good sound engine captures not just the tone but the personality of a piano. It must balance detail, depth, and responsiveness without sounding artificial.
Casio has decades of experience designing tone engines for pianos, synthesizers, and workstations. Donner is a much younger company and tends to focus on value-driven designs — maximizing features and voices for the price. That experience gap shows, but so does Donner’s ambition.
Casio CDP-S110: The AHL II Sound Engine
Casio’s CDP-S110 is powered by its AHL II (Acoustic & Highly-compressed Large-waveform) sound engine — a refined sampling system designed to reproduce the complex character of an acoustic grand piano. Each key’s sound comes from high-resolution stereo recordings of real piano notes, captured at different dynamic levels. This means when you play softly, you don’t just get a quieter sound; you get a genuinely different tonal character, just like on an acoustic. Press harder, and the timbre brightens, the harmonics expand, and the sound gains punch.
What stands out about Casio’s approach is restraint. The CDP-S110 doesn’t try to impress with sheer quantity. It comes with just 10 tones — including acoustic pianos, electric pianos, organs, strings, and harpsichord — but each one is chosen for musical usefulness. Casio doesn’t clutter the experience with filler sounds; instead, it focuses on making every voice feel playable and expressive.
The main concert grand piano patch is warm and balanced, with a natural decay and smooth dynamics. It’s clean without being sterile, bright without being tinny. The bass registers are full and resonant, while the treble maintains clarity even in complex passages. Through headphones or quality external speakers, you can hear subtle stereo imaging — the sense that the sound radiates naturally from left to right, just as it would from an acoustic piano’s soundboard.
Donner DEP-20: A Focus on Variety
Donner takes the opposite approach with the DEP-20. Instead of focusing narrowly on realism, it gives you 238 voices, covering everything from pianos and electric pianos to guitars, strings, synths, brass, basses, and percussion. It’s a smorgasbord of sounds, and that’s part of the appeal. Donner wants this to be not just a piano, but an all-around instrument for learning, practice, and creativity.
Among those hundreds of voices, the main acoustic piano sound is the star. It’s warm, rich, and slightly darker than Casio’s — with more low-mid emphasis. The tone fills a room nicely and works well for pop, ballads, or general playing. However, the sampling quality isn’t as refined. The transitions between soft and loud notes aren’t as smooth, and the sustain doesn’t have the natural resonance of Casio’s AHL II engine. Still, for the price range, it’s surprisingly satisfying — easily one of the better-sounding budget pianos from a newer brand.
The other tones on the Donner are a mixed bag. Some, like the electric pianos and strings, are genuinely fun to play and sound lush when layered. Others feel more synthetic, with short loops or slightly artificial attacks. But for learners or casual players, the sheer variety keeps things interesting. You can experiment endlessly without getting bored.
Dynamic Range and Expression
Dynamic range — the difference between soft and loud sounds — is where Casio really shows its pedigree. On the CDP-S110, every change in touch produces a clear and predictable change in tone. Soft playing sounds mellow and rounded; hard strikes bring out brightness and detail. The tonal curve feels natural, allowing expressive phrasing and emotional control.
Donner’s DEP-20 is dynamic too, but less refined. The velocity sensitivity (how the sound responds to how hard you press) can feel a little uneven. Soft playing sometimes triggers slightly louder notes than expected, and the tonal change between velocities is more abrupt. This can make expressive control harder for advanced players, though beginners may appreciate the forgiving consistency.
Casio’s sound engine rewards touch control and nuance. Donner’s sound engine rewards exploration and fun.
Tone Character and Color
Casio’s tone character leans toward natural, balanced realism. The main piano sound has a slightly European flavor — reminiscent of a Steinway or Bösendorfer, with warm mids and crystalline highs. The tone is rich but never exaggerated. Even at high volumes, it retains clarity and doesn’t distort.
The Donner DEP-20’s piano tone has a more modern “pop” flavor. It’s bass-heavy and warm, which gives it presence in a mix or live performance but can sound a bit thick for classical or jazz. The mids are strong, the highs slightly rounded off. It’s a pleasing tone overall, especially for general music-making, though it lacks the intricate overtones and harmonic shimmer that Casio achieves.
Polyphony and Sound Layering
On paper, Donner wins the polyphony race: 128 notes compared to Casio’s 64. In theory, that means Donner can handle more overlapping notes — useful for dense pieces, heavy pedal use, or layered sounds. However, Casio’s AHL II engine uses resources efficiently, so in practice, you rarely hit the 64-note limit unless you’re doing extreme layering.
Both keyboards support dual-layer mode, allowing you to blend two sounds (for example, piano + strings). Casio’s layering feels cohesive — both voices balance naturally and respond consistently to touch. Donner’s layering works too, but since the voices vary widely in quality, results can be hit or miss depending on the combination.
Donner also includes a split mode, letting you assign different sounds to the left and right hands — a nice touch for practice or performance setups. Casio offers the same, though with fewer sound choices.
Effects and Customization
Casio keeps effects minimal but tasteful. You get reverb and chorus, both adjustable in depth. The reverb is particularly well-voiced, simulating room or hall acoustics with natural warmth. Casio understands restraint — the effects enhance without overwhelming the core piano tone.
Donner, by contrast, gives you more flexibility. Its reverb and chorus effects are also adjustable, and they’re paired with the ability to save custom sound settings in user memory. You can tweak the tone to your liking and recall it easily. While the effects themselves aren’t studio-grade, they’re surprisingly usable and contribute to the DEP-20’s creative versatility.
Headphone and Speaker Tone
Listening through headphones is often the truest test of a piano’s sound engine. The Casio CDP-S110 shines here. The stereo samples sound deep and natural, with no noticeable hiss or digital artifacts. The tonal image is immersive — you feel like the sound is emanating from an acoustic space rather than directly from the headphones.
The Donner DEP-20 sounds good through headphones as well, though you can hear the difference in sample quality. Some tones exhibit faint looping or slight harshness in the upper registers. It’s not unpleasant — just a reminder that this is a more budget-oriented sound set.
Through speakers, Donner’s piano sound has more body and power, while Casio’s is clearer and more balanced. Donner’s fuller low-end is great for pop or rock; Casio’s balanced tone suits solo playing and practice.
Resonance and Sustain
One of the biggest differences lies in how each instrument handles resonance — the way notes interact when sustained. Casio simulates damper resonance, allowing harmonics from one note to subtly influence others, as on a real piano. When you press the sustain pedal, the sound blooms naturally.
The Donner DEP-20’s sustain is more digital — notes simply stack and decay linearly. It’s still effective, but lacks the organic interaction found in Casio’s tone. This makes Casio’s piano sound more “alive,” while Donner’s feels more straightforward.
Verdict
When it comes to sound engine and tone quality, the difference between the two instruments boils down to philosophy. Casio prioritizes authenticity, precision, and expressive realism. Every sound feels thoughtfully crafted and musically believable. The Donner, meanwhile, prioritizes abundance — giving you a huge palette of tones to explore, even if some are less refined.
If your goal is to learn piano properly, develop expressive touch, and enjoy a tone that feels close to the real thing, the Casio CDP-S110 wins decisively. Its AHL II engine delivers a believable acoustic piano experience that holds up under serious playing.
If your goal is to have fun, experiment, and get the most variety for your money, the Donner DEP-20 delivers exceptional value and versatility. Its piano tone may not rival Casio’s in realism, but its broad sound library and adjustable effects make it a playground for creativity.
In short: Casio sounds like a piano; Donner sounds like a keyboard pretending to be everything. Both have their place — it just depends on which kind of player you are.
Internal Speakers & Acoustic Projection
For most home pianists, the internal speakers are the main way they experience the sound of their instrument. Even though both the Donner DEP-20 and the Casio CDP-S110 offer headphone outputs and external audio connectivity, the built-in speaker system is where you’ll hear each piano’s sound engine in its most natural form — or, in some cases, its most limited form. Speakers define how the piano projects sound into a room, how full or thin it feels, and how satisfying it is to play without extra gear. Both Donner and Casio take very different approaches to onboard sound projection, shaped by their design philosophies, target users, and cost priorities. Let’s take a close look at how these two pianos stack up when it comes to volume, clarity, realism, and overall acoustic presence.
Speaker Specifications and Design Philosophy
The Casio CDP-S110 comes with a dual 8-watt speaker system, a design that prioritizes balance and clarity over brute loudness. The speakers are built into the top-facing panel, projecting sound upward toward the player and outward into the room. This positioning helps create a more natural listening experience, allowing the sound to blend with ambient reflections off walls and ceilings. Casio’s speaker housings are compact but well-engineered, with ports that help enhance bass response without making the tone muddy.
The Donner DEP-20, on the other hand, houses a dual 25-watt speaker system — significantly more powerful on paper. The speakers are positioned on either side of the keyboard, facing slightly forward. This design produces a more direct, room-filling sound that feels immediately louder and more energetic than the Casio. Donner clearly wanted to impress with volume and power, aiming to give players a sense of performance presence even without amplification.
In theory, Donner’s higher wattage gives it an advantage. In practice, wattage doesn’t tell the full story. Speaker tuning, cabinet design, and frequency balance play huge roles in determining how realistic and pleasant the sound feels. Casio’s 8-watt speakers may seem modest, but they’re finely tuned to match the piano’s acoustic samples, producing a more accurate and coherent tonal image. Donner’s 25-watt system, while impressive in size, sometimes sacrifices tonal precision for sheer loudness.
Sound Clarity and Frequency Response
Casio’s speakers emphasize clarity and natural tone balance. The frequency range feels even across lows, mids, and highs, meaning you can hear each note’s detail without one range overpowering another. The bass is clean but not overly emphasized, which helps maintain definition even in complex chords. The midrange — where the body of the piano tone lives — sounds warm and open, while the treble sparkles without harshness.
This clarity makes the CDP-S110 particularly pleasant for extended practice sessions. The speakers are tuned to complement the piano’s AHL II sound engine, ensuring that what you hear matches what you feel under your fingers. Even when you play softly, the sound remains full and dynamic. Turn up the volume, and the piano maintains composure without distortion. Casio’s decades of refinement in small-speaker acoustics (from its keyboards to its home pianos) clearly pays off here.
The Donner DEP-20, by contrast, emphasizes volume and bass presence. The first impression when you turn it on is that it sounds bigger and fuller. The low-end response is strong — you can feel the bass notes resonate through the stand or desk it’s placed on. This gives pop, rock, and electronic sounds impressive body, especially for the price. However, that same bass boost can sometimes overshadow the midrange clarity that’s crucial for piano playing. The result is a thicker, more “boom-heavy” tone that fills the room nicely but isn’t as detailed or nuanced as Casio’s presentation.
Treble response on the Donner is decent but slightly recessed compared to Casio’s. High notes are audible, yet they lack the sparkle and definition that help melodies cut through. This is partly due to the speaker design and partly to how the sound engine’s samples are EQ’d. For casual listening, it sounds warm and satisfying, but for more critical or expressive playing, it can feel less transparent.
Stereo Imaging and Spatial Realism
One of the subtle but important aspects of speaker quality is stereo imaging — how well the piano reproduces the left-right spread of sound. A real grand piano radiates tone unevenly: bass notes project more from one side, treble from the other, with natural resonance in between. Casio mimics this with stereo sampling and speaker placement that enhances that natural spread. The result is a convincing sense of depth and space when you sit at the keyboard. The CDP-S110’s sound seems to bloom from the instrument rather than come from two isolated points.
The Donner DEP-20’s stereo field is wider in a literal sense — the speakers are placed farther apart — but the sound doesn’t always feel as three-dimensional. The stereo effect is there, but the center image can feel less cohesive. When you play chords in the midrange, the tone sometimes feels like it’s coming from two separate boxes rather than a single resonant soundboard. For casual home use, this isn’t a dealbreaker, but for players who value a sense of realism and immersion, Casio’s more integrated projection feels more piano-like.
Loudness and Headroom
There’s no denying that Donner’s 25-watt speakers can fill a room. For small performances, jam sessions, or teaching environments, the DEP-20 has enough power to cut through ambient noise without needing an amp. Even at mid-volume, it projects confidently. For players who want that sense of “oomph,” Donner delivers. However, when you push the volume toward maximum, distortion and cabinet vibration can creep in, particularly in the low frequencies.
Casio’s 8-watt system doesn’t get as loud, but it’s impressively efficient. The piano remains distortion-free even at full volume, maintaining a balanced tone. In smaller rooms or apartments, the CDP-S110’s volume range is more than enough. If you need more projection, you can easily connect it to external speakers or an amplifier through its line-out or headphone jack.
So while Donner wins the loudness contest, Casio wins on refinement. Donner gives you punch and presence; Casio gives you purity and polish.
Playing Feel and Acoustic Feedback
Speakers affect more than just what you hear — they influence what you feel. On an acoustic piano, vibrations travel through the frame and keys, giving physical feedback that enhances the connection between touch and sound. Digital pianos can’t replicate this fully, but a well-tuned speaker system can help by resonating naturally with the keyboard.
Casio’s sound projection provides subtle acoustic feedback. You can feel gentle vibrations through the keys and cabinet, especially in the bass range. It’s not overwhelming but contributes to a sense of “playing a real instrument.” Donner’s larger speakers, by contrast, create a stronger physical presence — the low-end resonance is tangible. This can feel exciting and immersive, though at times it borders on vibration rather than resonance, particularly at high volumes.
Suitability for Different Environments
Casio’s speaker system feels purpose-built for home and studio practice. It excels in clarity and consistency, making it ideal for players who focus on proper technique or expressive control. In smaller spaces or shared apartments, it’s perfect — rich sound without excess volume.
Donner’s system suits different priorities. If you often play in open rooms, small gatherings, or environments where a bit of extra projection helps, the DEP-20 is more self-sufficient. Its volume and low-end power give it an edge for informal performances or teaching sessions where sound needs to carry.
However, for late-night practice with headphones or precision playing, Casio’s smoother tone and less aggressive bass are easier on the ears over time.
Verdict
In terms of internal speakers and acoustic projection, both the Casio CDP-S110 and the Donner DEP-20 deliver solid performance — but with very different personalities.
Casio’s speakers are refined, balanced, and acoustically honest. They reveal the instrument’s tone with precision and warmth, offering an experience that feels cohesive and musical. The sound might not shake the walls, but it engages you in a way that supports serious piano practice.
Donner’s speakers, meanwhile, prioritize power and presence. They make the instrument sound impressive and bold, ideal for beginners or hobbyists who want energy and excitement right out of the box. The trade-off is less tonal detail and slightly uneven frequency balance.
In short: Donner is louder; Casio is truer.
If you crave full-bodied volume and fun, the DEP-20 delivers. But if your goal is a clean, balanced, and realistic piano sound that lets you focus on musicality rather than raw output, the CDP-S110 stands out as the more acoustically refined instrument.
Functions & Usability
A digital piano’s value isn’t defined only by how it looks or sounds — it’s also about how easily it integrates into your musical life. Whether you’re a beginner learning scales, a songwriter testing chord progressions, or a hobbyist enjoying casual play, usability determines how much you’ll actually use and enjoy the instrument. The interface, menu design, feature accessibility, and built-in tools all play a major role. Both the Donner DEP-20 and the Casio CDP-S110 are marketed as beginner-to-intermediate digital pianos, yet they cater to very different user experiences. Casio focuses on simplicity and focus, while Donner offers a buffet of features aimed at flexibility and creativity.
Let’s break down how these two instruments compare in terms of functions, controls, learning tools, and day-to-day usability.
Interface and Control Layout
Casio has always been known for minimalism, and the CDP-S110 continues that tradition. Its interface is clean, intuitive, and stripped down to essentials. You’ll find a small cluster of buttons above the keys and a simple LED indicator for selecting voices and functions. There’s no large display, no complex menu system — everything is accessed through a combination of key presses and button selections.
At first glance, this simplicity might seem limiting, especially compared to modern keyboards with full screens and deep menus. But in practice, it’s wonderfully straightforward. You turn it on, select a tone, and play. This design philosophy prioritizes the piano experience above all else. There are no distractions, no confusion, and no steep learning curve. Even a complete beginner can confidently navigate the CDP-S110 within minutes.
The Donner DEP-20, on the other hand, takes the opposite approach. It embraces a feature-rich interface complete with a bright LCD display and a generous array of buttons. You can directly access sounds, rhythms, functions, and settings without needing to remember key combinations. For players who love to experiment with sounds, layer tones, or customize effects, this layout is extremely handy. Everything feels accessible at a glance.
That said, this added complexity can overwhelm absolute beginners. The DEP-20’s interface looks more like a synthesizer or arranger keyboard than a straightforward piano. While the screen makes navigation easier once you get used to it, the sheer number of buttons and features might initially distract users who just want to sit down and play.
Casio’s design wins for elegance and focus. Donner’s wins for versatility and control. Your preference depends on whether you prioritize simplicity or creative flexibility.
Sound Selection and Layering
Casio keeps things lean: the CDP-S110 offers 10 high-quality built-in tones, including two acoustic pianos, electric pianos, organs, strings, and harpsichord. Each tone is polished and realistic, crafted to match the expressive range of the keyboard. You can layer two tones (for example, piano + strings) or split the keyboard to play two different sounds with each hand. These features are easy to activate, though you’ll need to refer to the manual the first few times to memorize the key combinations.
Donner’s DEP-20, by contrast, comes with a staggering 238 built-in sounds — an enormous library that covers everything from acoustic instruments to synths, pads, percussion, and sound effects. For players who enjoy experimenting, this variety is addictive. You can layer two tones, split the keyboard, or even use the accompaniment section to jam with backing tracks. The DEP-20 also includes reverb and chorus effects that can be adjusted directly through the control panel, adding a personal touch to your sound.
While Casio’s limited tone set might feel restrictive to some, its advantage lies in consistency. Every sound feels deliberate and musical, whereas Donner’s vast library includes both gems and filler. Some tones are quite usable and expressive, while others sound thin or dated. However, for a beginner exploring different genres or for someone using the DEP-20 as a multi-purpose keyboard, the variety is undeniably fun and inspiring.
Accompaniment and Rhythm Features
Here’s where Donner clearly separates itself from Casio. The DEP-20 functions as both a digital piano and an arranger keyboard. It offers 200 rhythm styles, 100 demo songs, and dual-track recording, giving players a mini studio right inside the instrument. You can select accompaniment patterns, adjust tempo, and even play along with automatic chord backing — ideal for learning rhythm, improvising, or creating quick song sketches.
The built-in lesson function and demo songs are especially helpful for beginners. You can practice along with preloaded tunes, track your timing, or record your own performances to evaluate progress. These features make the DEP-20 feel like a more interactive experience, almost like a musical playground.
Casio takes a much more minimalist route. The CDP-S110 skips rhythms, accompaniments, and recording features entirely. Its design philosophy is clear: focus on playing and learning piano fundamentals rather than exploring a full keyboard workstation. This approach makes sense for serious learners, as it avoids distractions and encourages disciplined practice.
So, if you’re looking for built-in play-along tools and fun ways to jam, the Donner DEP-20 is the hands-down winner. But if your goal is to focus on authentic piano study without extra bells and whistles, the Casio’s restraint works in your favor.
Recording and Practice Tools
Recording is a key feature for anyone who wants to monitor their progress or capture ideas. The Donner DEP-20 includes a simple two-track recorder, allowing you to record left and right hand parts separately, or create basic multi-layer arrangements. The interface for recording is easy to use, and playback quality is solid for casual use.
Casio’s CDP-S110 doesn’t have onboard recording, which might disappoint players who like to document their practice sessions. However, you can connect it to external software via USB and record using a DAW (Digital Audio Workstation) or Casio’s free Chordana Play app. The app allows you to record, visualize your playing, and even load MIDI songs for guided practice.
In short, Donner offers self-contained recording right in the keyboard. Casio provides a more modern, app-driven approach that leans on external devices but delivers higher-quality results once set up.
Connectivity and Compatibility
Usability isn’t just about internal functions — it’s also about how well the instrument connects to the rest of your setup.
The Casio CDP-S110 includes USB Type-B connectivity, allowing you to plug directly into a computer, tablet, or smartphone. This enables MIDI data transfer for recording, virtual instruments, and online lessons. It’s compatible with Casio’s Chordana Play app, which adds learning tools, song playback, and visual score displays. The CDP-S110 can also run on batteries, a rare and practical feature that enhances portability.
The Donner DEP-20 offers USB-to-host and USB-to-device ports, along with MIDI In/Out and a sustain pedal input. The USB-to-device function even lets you plug in a USB flash drive to save recordings or play back MIDI files directly. This makes the DEP-20 surprisingly flexible as a standalone music tool. For players who want to use it as a controller or integrate it with external software, it’s fully capable.
Both keyboards feature headphone jacks, though Donner includes dual headphone outputs, a nice touch for teachers and students practicing together.
Navigation and Day-to-Day Usability
Casio’s minimal interface means there’s very little that can go wrong. Turn it on, select a tone, and play — it’s almost impossible to get lost in menus or accidentally change settings. The lack of a screen keeps your attention on the keys rather than the controls. The downside is that making adjustments (like changing touch sensitivity or reverb) requires memorizing key combinations or checking the manual.
Donner’s LCD screen and dedicated buttons make real-time control much easier. You can quickly navigate between sounds, rhythms, and settings without guessing. The menu is logically structured, and the screen provides immediate visual feedback. For someone who likes to tweak and experiment, it’s far more satisfying. However, the abundance of options also means you’ll spend more time managing features instead of just playing.
In short: Casio’s usability is simple and streamlined. Donner’s is powerful and feature-packed, but slightly busier.
Educational and Practice Features
Casio’s CDP-S110 focuses on essentials but pairs nicely with its Chordana Play app, which transforms a smartphone or tablet into a visual learning assistant. The app shows sheet music, tracks your progress, and helps with step-by-step practice. It’s a great modern addition that compensates for the instrument’s lack of built-in lesson modes.
Donner integrates traditional built-in learning tools directly into the DEP-20. You can play along with demos, use the metronome, split parts for duet mode, and record your performances. These features make it a more complete standalone learning environment — no app required.
For young learners or self-taught beginners, Donner’s built-in guidance tools feel welcoming and engaging. For students taking formal piano lessons, Casio’s focused, app-integrated system offers a cleaner and more disciplined approach.
Verdict
When it comes to functions and usability, the two pianos appeal to very different audiences.
The Casio CDP-S110 is a model of focus and simplicity. It strips away distractions to give you a pure, intuitive piano-playing experience. It’s ideal for those who want to learn seriously, practice technique, or use it as a portable, no-fuss practice instrument. Its integration with Casio’s app ecosystem makes it quietly powerful despite its minimalist surface.
The Donner DEP-20, on the other hand, is bursting with features. It’s playful, flexible, and built for experimentation. Beginners, hobbyists, or anyone who enjoys exploring rhythms, accompaniments, and a huge sound library will find it endlessly entertaining. However, it demands a bit more attention to manage all those options.
If you want an instrument that behaves like a piano first and foremost, Casio wins for usability. If you want a piano that doubles as a creative playground, Donner takes the crown for functionality. Both deliver value in their own way — the choice ultimately depends on whether you crave focus or freedom.
Connectivity
In today’s music landscape, a digital piano’s connectivity is almost as important as its sound or keyboard feel. Gone are the days when a piano was a standalone instrument. Now, players expect their instruments to talk to computers, tablets, smartphones, recording gear, and even other instruments. Whether you’re learning from an app, recording music, performing live, or teaching students, the ability to connect easily — and reliably — determines how versatile your digital piano really is.
The Donner DEP-20 and the Casio CDP-S110 both recognize this demand, but they approach connectivity in very different ways. Casio leans into modern minimalism and integration with smart devices, while Donner offers a more traditional, port-heavy setup designed for flexibility and hands-on control. Let’s dive deep into how each piano performs in this crucial area, from ports and compatibility to software integration, recording potential, and real-world usability.
Physical Connections and Ports
The Casio CDP-S110 keeps its hardware connectivity simple but effective. It comes with the essential USB Type-B port, which functions as a USB-MIDI interface. This means you can connect the piano directly to a computer, tablet, or smartphone using a standard USB cable (or an adapter for mobile devices). Once connected, the piano sends MIDI data to compatible apps or software, allowing you to use virtual instruments, notation software, or learning tools.
Beyond USB, Casio includes two 1/8-inch (3.5mm) stereo headphone outputs. This dual output design is extremely practical for late-night practice or duet lessons — a teacher and student can plug in simultaneously. However, it’s worth noting that there’s no dedicated line-out port. This means that if you want to connect the CDP-S110 to external speakers, mixers, or amplifiers, you’ll have to use the headphone output for that purpose. While this works fine for casual setups, it’s not ideal for stage performance or professional recording since the headphone output isn’t a true line-level signal.
The Donner DEP-20, by contrast, offers a more extensive and flexible array of physical connections. It includes USB-to-host and USB-to-device ports, MIDI In/Out jacks, dual headphone outputs, a sustain pedal input, and even auxiliary audio ports for external devices. This is a significant advantage for users who want a more traditional and versatile connection system.
The USB-to-host port works much like Casio’s USB-B connection — it allows the DEP-20 to communicate MIDI data with a computer or smart device. The USB-to-device port is where Donner pulls ahead: it lets you plug in a USB flash drive to save recordings, load songs, or play back MIDI files directly from the piano. This is a feature rarely seen in this price range and gives Donner’s instrument a more “standalone workstation” vibe.
Meanwhile, the MIDI In/Out ports (the classic 5-pin connectors) allow the DEP-20 to integrate with older gear — synthesizers, sequencers, or MIDI controllers — without relying on USB. This gives it a level of backward compatibility that modern minimalist pianos like Casio’s lack.
Overall, in terms of sheer number of ports and versatility, the Donner DEP-20 clearly offers more connection options. But as we’ll see, more ports don’t always mean better real-world usability.
USB and MIDI Integration
Both instruments function as MIDI controllers, meaning they can send note and control data to other devices or software. This is where the CDP-S110’s simplicity shines. When you connect it to a computer, it’s recognized automatically — no drivers, no extra setup. It integrates seamlessly with music software like GarageBand, Logic, Ableton Live, or educational apps such as Casio’s Chordana Play, Simply Piano, and Flowkey.
Casio’s MIDI output is rock-solid and latency-free. You can record MIDI performances directly into a DAW, trigger virtual instruments, or use interactive tutorials that display notes in real time. For beginner and intermediate players, this kind of plug-and-play functionality is invaluable.
The Donner DEP-20 also supports MIDI over USB and traditional 5-pin connections, which broadens its use in professional or experimental setups. You can use it to control synthesizers or other sound modules in a live rig, or to record into any DAW. However, Donner’s MIDI implementation, while functional, isn’t as refined or low-latency as Casio’s. There can occasionally be minor timing inconsistencies, especially when layering complex accompaniment features or using multiple sounds simultaneously. For casual use, it’s fine, but serious producers might notice the difference.
The DEP-20’s dual MIDI ports (USB and DIN) do offer one major advantage: it can serve as a MIDI hub between newer USB-based devices and older gear, making it useful in more advanced studio environments.
Audio Connectivity and Output Quality
For audio output, both pianos primarily rely on their headphone ports. As mentioned, Casio doesn’t include a dedicated line-out, which limits professional-level connectivity. Still, the headphone output is clean, with low noise and minimal distortion, suitable for home recording or external amplification in smaller settings.
The Donner DEP-20 has a true auxiliary output, allowing you to connect directly to external speakers, amplifiers, or recording interfaces without repurposing the headphone jack. This makes it more convenient for performers or teachers who need to project sound in larger spaces. Additionally, the DEP-20 supports aux input, so you can connect your phone or MP3 player and play backing tracks through the piano’s speakers. This is an underrated but useful feature for practice or casual performance.
Casio’s focus is on sound purity rather than connectivity variety. The DEP-20’s setup is undeniably more flexible for users who want to connect multiple devices simultaneously.
App and Software Compatibility
Casio has invested heavily in software integration. The CDP-S110 works flawlessly with Casio’s Chordana Play for Piano app — available for iOS and Android — which expands its learning and control capabilities. Through this app, you can control various parameters (like tone selection, metronome, and touch sensitivity) more easily than through the onboard buttons. You can also view sheet music, play along with songs, and track your progress in real time.
The app makes the CDP-S110 feel smarter than it looks. It essentially compensates for the piano’s minimalist interface by giving you a touchscreen menu on your phone or tablet. For learners, it’s an invaluable tool — almost like having a personal tutor built into your piano.
Donner, while offering a more hardware-based feature set, doesn’t have an official companion app with the same level of integration. However, because the DEP-20 uses standard USB-MIDI protocol, it works with most third-party apps and software like Flowkey, Synthesia, and GarageBand. You can use these to learn songs, visualize your playing, or record compositions. The only downside is that you’ll have to manage the setup yourself, as Donner’s system doesn’t guide you through pairing or configuration like Casio’s ecosystem does.
External Control and Pedal Connectivity
Pedal connectivity is another part of the connectivity equation that’s often overlooked. The Casio CDP-S110 includes a standard sustain pedal jack and comes bundled with a simple footswitch-style pedal. It’s basic but responsive, suitable for most beginners. If you want half-pedaling capability (which allows nuanced control over sustain), you’ll need to upgrade to Casio’s SP-34 triple pedal unit, which connects through a special multi-pin jack on the underside of the keyboard. This accessory unlocks more advanced control for expressive playing.
The Donner DEP-20 also comes with a basic sustain pedal and includes a sustain input jack compatible with most third-party pedals. Some bundles include a full pedal unit that resembles an acoustic piano’s three-pedal setup, though this depends on where you buy it. Donner’s pedal implementation is simple but reliable, with no noticeable latency or “sticking” issues.
Both pianos support expression through external pedals, but Casio’s half-pedaling support and proprietary triple pedal option give it a small edge for players seeking authentic piano dynamics.
Recording, Data, and File Transfer
Casio’s approach to recording and data handling relies on external devices. Since it doesn’t have onboard recording or USB-to-device functionality, you’ll need to use a connected app or computer to capture your performances. While that may sound like a limitation, it results in higher-quality recordings, as you can use professional software to mix and edit your work.
Donner, meanwhile, allows direct recording to USB flash drives, storing performances as MIDI data. You can play them back instantly through the piano or transfer them to a computer later for editing. This self-contained system is great for those who want quick, hassle-free recording without relying on extra gear. It’s also useful in teaching environments, where students can record their practice sessions directly on the piano.
So, Casio’s connectivity favors integration with modern digital workflows, while Donner’s caters to independent, hardware-based recording. Both methods have their strengths depending on your workflow.
Live Use and Performance Connectivity
For gigging musicians, connectivity is often the deciding factor. Casio’s lightweight design and simple MIDI setup make it ideal for portable use, but the lack of line-out limits its flexibility on stage. You can still run it through a DI box or mixer via the headphone output, but it’s not the cleanest solution.
Donner’s dedicated outputs and higher wattage speakers make it more self-sufficient for live performance. You can plug directly into an amp or PA system, use MIDI to control external instruments, or even play back pre-recorded tracks from a USB drive. However, its heavier build and less refined sound engine might not appeal to professionals who prioritize tone authenticity over versatility.
Verdict
Connectivity is one of the few areas where both instruments excel, but for entirely different reasons.
The Casio CDP-S110 delivers modern, streamlined connectivity that perfectly supports its minimalist design. It’s easy to integrate with smart devices, music apps, and DAWs, making it ideal for learners, home musicians, and anyone who values simplicity and reliability. Casio’s software ecosystem, especially the Chordana Play app, adds immense value without requiring complex setup.
The Donner DEP-20, on the other hand, is a connectivity powerhouse. With its multiple USB ports, traditional MIDI jacks, aux input/output, and USB recording, it’s a dream for tinkerers, teachers, and creative players who love flexibility. It might not be as refined in terms of integration, but it offers raw versatility that Casio doesn’t match.
In essence:
- Casio CDP-S110 = Smart, app-driven, simple, and dependable.
- Donner DEP-20 = Feature-rich, versatile, and hardware-focused.
If you value ease of use and seamless integration with modern learning and recording tools, Casio’s connectivity philosophy will fit you best. If you want a more traditional, all-in-one workstation with maximum hardware options, Donner’s connectivity suite gives you more room to explore. Both succeed, but they serve very different musical lifestyles.
Conclusion
Choosing between the Donner DEP-20 and the Casio CDP-S110 really comes down to what kind of player you are — or what kind of player you want to become. Both instruments sit in the same budget-friendly category, but they take two completely different paths in how they deliver value.
The Casio CDP-S110 is the cleaner, more focused instrument. It puts its energy into the fundamentals: a solid key action, a polished piano tone, dependable speakers, and seamless app integration. It doesn’t overload you with features you may never use. Instead, it gives you a consistent, realistic playing experience that encourages proper technique and musical growth. If you care most about how authentic the piano feels and sounds, Casio is the safer and more musically satisfying bet.
The Donner DEP-20, meanwhile, is all about offering as much as possible for the price. More sounds. More rhythms. More connections. More power. If you’re a beginner who loves experimenting with different tones and styles, or you want a keyboard that doubles as a mini workstation, the DEP-20 delivers a ton of fun and flexibility. It doesn’t feel as refined or realistic as the Casio, but it gives you creative tools that the CDP-S110 simply doesn’t attempt to provide.
The decision, then, is simple:
- Choose Casio CDP-S110 if you want an authentic piano experience with reliable feel, clean tone, and minimal distractions. It’s the better choice for serious learners.
- Choose Donner DEP-20 if you want features, power, variety, and a big sound system — a keyboard that invites exploration and creativity at a low price.
Both pianos offer great value, just in different ways. Knowing what matters most to you makes the choice clear.