Casio PX-870

Casio Privia PX-870 is the flagship of the Privia series, a console-style digital piano designed to bring a true grand piano experience to your home or studio. With authentic sound and playing feel, a modern elegant cabinet design, and a powerful Sound Projection system, the PX-870 is an instrument that will inspire performers, teachers, and music enthusiasts alike.

Brief Summary (Key Highlights)

• Sound source: Multi-Dimensional Morphing AiR Sound Source (4-layer stereo grand)

• Keyboard: Tri-Sensor II Scaled Hammer Action (simulated ebony & ivory) — 88 keys

• Polyphony: 256 notes

• Sound system: Sound Projection — 40W, 4-speaker (surround sound) + Volume Sync EQ

• Internal content: 19 tones, 60 built-in songs, Concert Play (10 orchestral recordings)

• Connectivity: 2 headphone outputs, USB Type A/B, 3-pedal connector, slide-type keyboard cover

• Color: black / white / oak (various finishes)

Sound technology — the closest reality to a grand piano

The heart of the PX-870 is the Multi-Dimensional Morphing AiR Sound Source. New four-layer stereo grand samples create richer, more natural, and sustained tones. This system simulates not only the sound of the strings but also the resonance of the entire piano cabinet, damper resonance, key-off, and key-action sounds. Result: Inter-string harmonies and subtle resonance nuances written by composers like Debussy and Ravel are expressed in a vivid and convincing way.

Lid Simulator, String Resonance, Key Off Simulator, and Key On / Off Action Noise details ensure the PX-870 presents all stages of sound dynamics from onset to decay in a natural manner.

Keyboard & Playing feel — created to be felt

• Tri-Sensor Scaled Hammer Action Keyboard II: the three-sensor system reads key movement precisely and provides the same “sound timing” feel as a grand piano — meaning the subtle delays between touch and sound are also realistic.

• Simulated ebony & ivory surface: reduces finger slippage and ensures comfort during long playing sessions.

• Adjustable touch & hammer response: settings adapted to different playing styles.

• 256-note polyphony: prevents note cutting in complex arrangements and performances using the pedal.

Sound Projection — room-filling rich sound

The PX-870's Sound Projection system emits piano sounds from various points to surround the listener — just like in a classic grand piano. With 40W (20W+20W) power and a 4-speaker (12 cm x2 + 4 cm x2, 2-way) configuration, the piano easily fills both a small hall and a living room. Volume Sync EQ ensures a balanced and clear sound across all frequencies, even at lower volume levels — ideal for night practice and headphone use.

Education, performance, and interactive features

• Concert Play: Play along with 10 live orchestral recordings. LISTEN/LESSON/PLAY modes; you can mute the piano part and play yourself, and change the speed.

• Duet Mode: splits the keyboard into two equal ranges for teacher and student to practice simultaneously.

• Headphone Mode: optimizes sound when playing with headphones — natural feel and spacious stage effect. The PX-870 features two ¼” stereo jacks on the front panel, allowing two people to use headphones at the same time.

• Instant / Audio Recorder: possible to record 99 songs (approx. 25 min/song) to USB memory in WAV 44.1 kHz format.

• MIDI Recorder: 2 tracks, ~5,000 notes — real-time recording and playback.

• Daily convenience features like Slide-type keyboard cover and Auto Power Off.

Effects, acoustic simulations, and voices

• Hammer Response (4 levels), Key Off Simulator, String Resonance (4 levels), Damper Resonance (4 levels), Damper/Key Action Noise

• Hall Simulator (4 types), Reverb (4 types), Chorus (4 levels), Brilliance (-3 ~ +3), DSP presets

• Layer / Split, Octave Shift (-2 ~ +2), Transpose (-12 ~ +12 semitones), Tuning Control (A4 = 415.5 ~ 465.9 Hz)

• Scales: Equal temperament + 16 variations

• Metronome: 0–9 beats, 20–255 BPM, tap tempo support

This rich arsenal helps you design your performance as desired and rapidly increase your practice and performance levels.

Connectivity and expansion

• USB Type A & Type B (class-compliant): fast and driverless connection with PC/Mac/iOS/Android.

• Connector for 3-pedal unit — for connecting a professional pedal unit.

• PHONES/OUTPUT: 2 (standard stereo jack) — for two headphones or separate outputs.

• CASIO Music Space app support for mobile control, sound settings, and tutorial features.

Technical Summary (brief)

• Keyboard: Tri-Sensor II, 88 keys

• Sound source: Multi-Dimensional Morphing AiR

• Polyphony: 256

• Tones: 19

• Internal songs: 60 (+ 10 user songs)

• Sound system: 12 cm x2 + 4 cm x2 (2-Way, 4-Speaker)

• Amplifier: 20W + 20W

• Dimensions: 1,393 × 299 × 801 mm (w/o music stand)

• Weight: 34.3 kg

• Power source: AD-E24250LW (DC 24V)

• Colors: Black / Oak / White (varies by model)

• Included: AC adapter, music stand

Who is it suitable for?

• Students and teachers who want to practice seriously at home

• Singers and composers suitable for small studios and home performance

• Music schools requiring interactive tutorials and duet modes

• Those looking for a realistic grand piano experience in a compact format

Why the PX-870 Digital Piano

• True grand experience: very realistic sound with AiR sound + lid & string resonance.

• Room-filling sound: richer stage effect with the Sound Projection system.

• Prepared for education and performance: Concert Play, Duet, dual headphone outputs, extensive recorder capabilities.

• Convenient connectivity: USB Type A/B, 3-pedal connector — comfortable for both studio and home use.

• Aesthetic and functional: elegant cabinet, sliding cover, and various finish options.