The larger dimensions of the P121 ultimately result in a larger acoustic chamber. In turn, generating a stronger, deeper sound that highlights more of the nuances in an artists style of play. As with all Yamaha instruments, this is constructed to the highest standard; with upmost attention being paid to long lasting performance. The P121 deserves its status as an investment, as it will comfortably see any pianist through their grades and much of their development. This model is equipped with the Yamaha SH Silent system, perfect for practicing without disturbing anyone.