The soundboard amplifies the sound of the string vibration, causing it to reverberate throughout the entire performance space. The C2X espressivo uses only carefully selected European spruce for its soundboard. By adopting the curved crown innovations used in the CFX Concert Grand Piano, the soundboard features exceptionally high vibration efficiency, and is superbly strong yet light in weight. Moreover, great care has been taken in making detailed adjustments and optimisation considering both the overarching concept of the C2X espressivo and its particular size. This gives the instrument depth in the mid-to-low frequencies and a remarkably rich melodic range, as well as a three-dimensional sound that envelops the player while maintaining a solid, resonant tone.

Yamaha has developed the entire action of the C2X espressivo in-house. To ensure the optimum response, the C2X espressivo has adopted the knowledge gained in developing the action for the CFX, and the contact points of each part have been optimised so that the full playing strength can be passed on to the strings without any loss or hindrance. A new shape has been adopted on the upper surface of the capstan screw to reduce initial friction, and the roller provides optimal elasticity, made from material and of a shape that has minimal difference between the static and dynamic friction forces, thereby improving how the action follows the player’s technique. In particular, it has achieved a smooth touch response that accurately corresponds to even the most delicate finger movements, making it possible to more precisely control even the subtlest changes in tonal nuance.

Even after the hammers are fitted into the piano, they still require more modification to fully reveal their potential. The elasticity of the hammers must be precisely adjusted manually by expert artisans to match the individual characteristics of each piano and to create the desired sound. A tremendous amount of time has been devoted to meticulously fine-tuning the resiliency of the hammers, specifically developed for the C2X espressivo, to realise the full potential of the intricate mechanisms. The result is a full, solid tonal quality that can be expressively varied from bass to treble, in a smooth, balanced manner. Moreover, skilled artisans use a special shaping process to adjust details in the action and the behavior of the damper, precisely preparing the entire piano by hand, considering the condition of the piano body and each of its minute parts.

This iconic music stand was designed specifically for the C2X espressivo. With functional openings on both sides for sound to escape and project, the sound more readily reaches the player’s ears, making it possible to perform while sensing and responding to sonic details previously unnoticed.