The U1J was designed based on Yamaha’s acclaimed U series upright acoustic piano line. Complementing the U series’ excellent tonal characteristics with exterior refinements, it features a well-polished finish that maintains the beauty of the instrument over a lifetime. TransAcoustic™ functionality has been added to this U1J. This is a TC3 type TransAcoustic™.

Newly developed TransAcoustic™ technology transmits digital sound directly to the piano soundboard, thus making the piano itself behave as a speaker. On a TransAcoustic™ piano, the sound that you hear is resonating directly from the soundboard. The tone generator sends an optimized audio signal to transducers that are connected by a coil to the soundboard. This sets the coils in motion, causing the soundboard to vibrate and generate sonic vibrations that travel through bridges attached to the soundboard, and are ultimately transmitted to the strings, making them resonate with sound.

There are times when the full sound of an acoustic piano may not be appreciated by your family or neighbors. For these situations, simply activate the TransAcoustic™ mode and the hammers will no longer strike the strings. Non-contact sensors under each individual key detect your keystroke depth, velocity and timing and send this information to the tone generator. Just adjust the volume and hear the digital sound of your piano performance coming from the entire instrument. Naturally, there is no need for headphones or external amplification.