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Kawai K300 ATX4


The Kawai K300 ATX3 upright piano. With the sound of hammers striking strings, resonating through solid spruce. Warm vibrations that illuminate a room, leaving its audience enchanted.

SKU: K-300 ATX4 Categories: , Brand:


Acoustic Tranquillity of the Kawai K300 ATX3

The natural voice of an acoustic piano is truly unmistakable. The natural voice of an acoustic piano is truly unmistakable. Add the ATX system and you have the perfect piano for silent playing when required: The Kawai K300 ATX3 Upright Piano. Record, use a metronome, try new voices. Don’t worry about making noise, only you can hear yourself. The perfect day and night piano.

A fine piano entices musicians to perform with spontaneity and passion, yet such unbridled expressiveness may not always be appropriate. Indeed, in certain environments, an acoustic piano can prove disruptive; the diligent tones of children practising scales are unlikely to be welcomed by other family members wishing to watch television, while even the most gentle, soothing chopin preludes have the potential to irritate neighbours if performed after an acceptable time. Fortunately, AnyTimeX instruments incorporate an acoustic muting feature with powerful digital audio components, allowing pianists to continue enjoying the distinctive feeling of a traditional piano, while listening discreetly using private headphones. Exceptional touch, optimum responsiveness, digital flexibility:

The new range of AnyTimeX hybrid pianos from KAWAI.

Back Assembly

The soundboard and ribs are considered the most important sound-producing components of a piano including Kawai K300 ATX3, with both the materials used and the manner in which they are assembled, greatly affecting volume and tonal quality. K Series soundboards are produced using the finest quality straight-grained spruce, carefully selected and scientifically tested to exceed KAWAI’s demanding resonance standards, ensuring exceptional dynamic range and outstanding tonal balance across the entire sound spectrum. In addition, the K-2 and K-3 soundboards utilise longer strings and a greater number of ribs – further exceeding the specifications of other pianos to provide improved power and resonance.

And with hard rock maple pinblocks, nickel-plated tuning pins and sturdy, multi-layered back posts, the completed back assembly of a KAWAI upright piano boasts outstanding structural integrity and enhanced tuning stability, providing decades of reliable performance.


In 1971 KAWAI revolutionised piano technology by introducing ABS action parts within the fine workings of the piano action. This rigid, atmospherically stable compound material, addressed many of the problems associated with wooden components, such as breakages under continual high stress, and shrinking and swelling due to changes in climate. The introduction of ABS action parts proved a significant development in modern piano design, and rapidly earned high praise from pianists and technicians worldwide. The Millennium III Upright Action, unveiled in 2006, has been developed to enhance the three performance elements that professional pianists most desire – speed, control and power.

The introduction of stronger ABS Carbon materials has allowed KAWAI scientists to develop lighter action parts without sacrificing durability, further optimising key repetition and response speed for a truly unparalleled playing experience.


Standing proudly amongst other items of fine furniture, the piano is often considered the centrepiece of any room it occupies. The exterior appearance of a piano contributes more to the overall aesthetic of playing and listening to music than arguably any other instrument. All K Series AnyTimeX models offer elegant lines and delicate cabinet accents that enhance their outward beauty, with meticulous attention to detail ensuring a stylish, well-balanced design for each instrument. The K-2, K-3 and K-5 AnyTimeX models feature front castors, fashioned in an attractive brass, while the exceptionally wide music rest – capable of accommodating multiple musical scores, utilises simulated leather to prevent pages from slipping during performance.

Finally, KAWAI’s integrated “Soft Fall” system lowers the weighty fall-board gracefully, protecting both the pianist’s fingers and the luxurious cabinet finish from a jarring close.


With the acoustic components muted, KAWAI AnyTimeX pianos, including the Kawai K300 ATX3 Upright Piano employ a unique digital technology, developed and refined at the Shigeru Kawai Research & Development Laboratory in Ryuyo, Japan, calling upon the finest hand-crafted KAWAI EX Concert Grand piano to deliver an unmistakably warm, authentic tone. Placed inside a purpose-built anechoic chamber, free of audio reflections, the rich sound of this world class instrument is meticulously analysed and recorded by our Master Piano Artisan pioneers. The acoustic portrait of each note is later transformed into a highly precise three dimensional digital representation, employing KAWAI’s proprietary Harmonic Imaging™ technology.

This unique process faithfully reproduces the broad dynamic range of the original grand piano, while also providing the source for a rich selection of additional high-quality instrument sounds.

IHSS Sensor System

A fine acoustic piano entices musicians to perform with enthusiasm, spontaneity and passion. Yet, the satisfaction that one enjoys when hammers strike the strings is often diluted by traditional piano silencing techniques. Sensors located below the keyboard struggle to accurately interpret the subtleties of musical expression, which is why AnyTimeX pianos integrate sensors within the fine workings of the piano action, reading the precise movements of each hammer. Whether performing rapid passages that demand the same key be played repeatedly before returning to its natural starting position, or pianissimo pieces desiring the very softest of key strokes, the Integrated Hammer Sensing System (IHSS) represents the elaborate nuances of every note.

Pianists can finally enjoy the convenience of absolute privacy, without sacrificing the responsive touch and authentic expression of a traditional acoustic piano.

Digital Convenience

KAWAI designers believe that the conspicuous presence of modern technology diminishes the enjoyment of playing and listening to a traditional acoustic instrument. The AnyTimeX control box is therefore discretely placed below the keybed, providing convenient access to useful functions without devaluing the piano’s appearance. In addition, the K-2, K-3, and K-5 AnyTimeX models including the Kawai K300 ATX3 feature an innovative slide-out control panel, with a gentle push revealing an LCD display and array of function buttons. Digital operation greatly extends the capabilities of the AnyTimeX piano beyond that of a traditional acoustic instrument, with convenient transpose and tuning facilities, a metronome and song recorder, and a selection of high fidelity sounds suitable for various musical occasions.

Dual headphone sockets provide greater flexibility for academic institutions, while MIDI and Line-Out connectors allow a range of creative music-making opportunities.

Soundboard 1.39m² Solid Spruce
Back Posts 4
Hammers Maple/Sycamore
Action Millennium III
Key Suface Acrylic/Phenol
Kind of key recognize IHSS, optical sensors
Harmonic Imaging II Sounds 22 (Concert Grand, Concert Grand 2, Studio Grand, Studio Grand 2, Mellow Grand, Mellow Grand 2, Modern Piano, Rock Piano, Classic E.Piano, Modern E.P., Slow Strings, String Pad, String Ensemble, Choir, Harpsichord, Harpsichord Oct., Vibraphone, Church Organ, Diapason, Jazz Organ, Drawbar Organ, New Age Pad)
DUAL Mode yes
Polyphony 192 Voices
Virtual Technician Voicing (6 types), Damper Resonance, String Resonance, Key Off Effect, Touch Curve (6 types), Temperament (9 types), Tuning, Stretch Tuning (2 types)
Reverb 5 types
Recorder 10 songs (total memory capacity approximately 90,000 notes)
Metronome Time signatures: 1/4, 2/4, 3/4, 4/4, 5/4, 3/8, 6/8, 7/8, 9/8, 12/8 Tempo: 10-400 BPM
LC-Display 16 characters x 2 lines
Jacks Headphones x2, MIDI (IN, OUT), LINE OUT (L, R), LINE IN (L, R), USB (to Host), DC IN
Accessories Included Headphone, AC Adaptor, Owner’s Manual
Size in cm (HxWxD) 122 x 151 x 59
Weight in kg 226

If you are interested in a Kawai K300 ATX3 upright piano then please get in touch.

Please see the full range of Kawai Pianos we stock.

Additional information

Weight226 kg
Dimensions151 × 59 × 122 cm

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