CX Series pianos feature a thickened back frame for improved support, providing a rich, resonant tone.
One of the most important factors in achieving a rich tone is the support provided within the instrument. When playing powerful fortissimo the force exerted on the instrument causes it to bend slightly, losing energy. The part of the piano that accepts this force and transforms it into deep reverberation is called the back frame, which could be likened to the skeleton in a human body. On the C3X for example, this back frame is approximately 20% thicker than on other pianos, providing significantly improved support, and reflecting the considerations on which the CX Series has been completely redesigned.