Digital Pianos Review
Casio Celviano AP-S450 Review: Hybrid Keys in the Slim Celviano
The AP-S450 puts Casio's Smart Hybrid Hammer Action with spruce-and-resin keys into the slim Celviano cabinet, with a newly developed concert grand, 26 tones, a 40 watt four-speaker system, a Visual Information Bar and the Bluetooth adapter included. This review covers why the action is the reason to choose it over the AP-S200 and AP-300, what the listing confirms, and how it compares with the Kawai CN201 and Roland RP701.
Our Verdict
Research Score 86/100The Casio Celviano AP-S450 is the slim Celviano to buy for a pianist, because the hybrid keys are a clear step above the Smart Scaled action in the AP-S200 and AP-300 and the four-speaker 40 watt system fills a room. The new concert grand is rich and the Bluetooth adapter is included. Polyphony is not published on the listing, and the Kawai CN201 and Roland RP701 remain the benchmarks for action and features at the price.
Editorial research score based on published specifications and documented features, not a customer rating or lab test.
Casio
Casio Celviano AP-S450
Best for: Pianists who want the hybrid action and a four-speaker system in a slim modern console
Skip it if: you want a traditional cabinet or a confirmed polyphony figure
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Listing verified: October 2026
Who Should Buy It
Buy it if
- Touch matters and the room is narrow
- You want 40 watts from four speakers rather than two
- You stream over Bluetooth and use the Casio app
Skip it if
- You want the rosewood upright look of the AP-300
- You prefer physical buttons
- You want documented polyphony before buying
Key Specifications
| Key Action | Smart Hybrid Hammer Action with spruce-and-resin keys |
| Sound Engine | Casio AiR with new concert grand sample |
| Voices | 26 |
| Polyphony | Not published in listing |
| Speakers | 40 W, 4 speakers |
| Bluetooth | Audio and MIDI via included WU-BT10 adapter |
| USB | USB to Host |
| Pedals | 3 pedals built in |
| Weight | 75 lb (34 kg) per listing |
| Form Factor | Slim console with Visual Information Bar |
Where the AP-S450 Fits
Casio offers two slim Celvianos: the AP-S200 with the Smart Scaled action and the AP-S450 with the Smart Hybrid Hammer Action. The AP-S450 also moves to 26 tones with a newly developed concert grand, a 40 watt four-speaker system with Headphone Mode and a Surround setting, and a Visual Information Bar that shows the metronome and settings on the panel. The WU-BT10 adapter for Bluetooth audio and MIDI is included. The listing confirms all of that and a 75 pound weight; polyphony is not published.
Smart Hybrid Hammer Action
The hybrid keys combine spruce with resin on a longer pivot, with textured surfaces and a whisper-quiet mechanism, and they are the same keyboard design as the AP-550, PX-S5000 and PX-S7000. The feel is firmer and more acoustic-like than the Smart Scaled action, with better leverage near the fallboard and a more controlled return. Against the Kawai RHIII on the CN201, which adds counterweights and let-off, the Casio is close in weight and slightly less refined at pianissimo; against the Roland PHA-4 Standard on the RP701, the Casio's wooden elements give a more substantial feel while the Roland has escapement.
Sound and Speakers
The newly developed concert grand, captured with precision microphones according to the listing, has the resonance and detail of Casio's recent flagship samples through the AiR engine. Twenty-five further tones cover a second grand, uprights, electric pianos, organs, strings and more. The four-speaker 40 watt system projects up and out, with a Headphone Mode that enhances bass on headphones and a Surround mode for a hall-like spread.
Polyphony is not published on the listing; Casio's specification should be checked before relying on a figure for layered, pedaled playing.
Connectivity
Bluetooth audio and MIDI through the included adapter, USB to Host for a computer and two headphone jacks cover home use. The Casio Music Space app provides settings, lessons and tone selection over Bluetooth. No USB audio recording is listed.
Assembly and Cabinet
At 75 pounds the AP-S450 assembles in under an hour with two people. The slim cabinet with a sliding cover sits close to a wall and comes in several finishes. A bench is not mentioned on the listing.
AP-S450 Against the Alternatives
Against the AP-S200, the action and the four-speaker system are the upgrades and they are worth the difference for anyone who plays seriously. Against the AP-300, the AP-S450 has the better action and speakers in a modern cabinet; the AP-300 has the traditional look and the movable lid. Against the Kawai CN201, the Kawai has the more refined action and documented 192-note polyphony; the Casio has stronger speakers and the Visual Information Bar. Against the Roland RP701, the Roland has 324 tones, a display and USB recording; the Casio has the firmer action and louder speakers.
Buy the AP-S450 for the best keys Casio puts in a slim console.
Daily Use and Practice
In daily use the AP-S450 is one of the easier Celvianos to operate because the Visual Information Bar shows what the invisible touch controls have done: the tempo, the metronome, the tone and the settings appear on the strip as you change them. Duet mode, two headphone jacks and a MIDI recorder cover lessons and silent practice, and the Casio Music Space app over Bluetooth MIDI adds notation and lessons on a tablet. Through the four speakers the Surround mode gives practice a hall-like spread that makes the piano more enjoyable to play for its own sake.
Long-Term Fit
The hybrid action carries a student through advanced repertoire, and the speaker system keeps the AP-S450 enjoyable through its own speakers for years. Owners who move on usually want Casio's Grand Hybrid series or a Kawai CA for a full wooden action. For a serious home pianist in a narrow room, it is one of the strongest slim consoles available.
Strengths and Limitations
Strengths
- Hybrid action with spruce-and-resin keys in a slim console
- 40 watt four-speaker system with Headphone Mode and Surround
- 26 tones with a newly developed concert grand
- Bluetooth adapter included and a Visual Information Bar for tempo and settings
Limitations
- Polyphony not published on the listing
- Touch controls again
- Plainer cabinet than the AP-300 and AP-550
How We Scored It
Scores reflect published specifications, documented features and value against the alternatives below. They are editorial research scores, not laboratory measurements.
Alternatives to Consider
Casio Celviano AP-S200
Buyers who want a slim, good-looking console with strong speakers and Bluetooth under the AP-550
Read the Casio Celviano AP-S200 review →
Kawai CN201
Pianists who want the most authentic action and tone in an entry Kawai console
Read the Kawai CN201 review →
Roland RP701
Families who want a complete home piano with a display, recording and a huge sound library around Roland's PHA-4 action
Read the Roland RP701 review →Head-to-Head Comparisons
- Casio Celviano AP-S450 vs Roland F701 Compare →
Questions Buyers Ask
Casio Celviano AP-S450
See the current listing, price and included accessories.
About This Review
Mandrillis Team
The Mandrillis editorial team researches and compares audio and music gear using manufacturer documentation, verified specs and real buyer feedback, so you can make a confident purchase without wading through marketing claims.
Read our full research methodology.