With the Yamaha exclusive Intelligent Acoustic Control (IAC) feature, people can enjoy playing their digital pianos at a lower volume in a quiet home environment. Before IAC was introduced, playing at a low volume resulted in a loss of treble and bass. With the addition of IAC, the instrument automatically adjusts the balance of bass and treble, creating a truer sound with more depth. Additionally, the volume dial automatically makes fine adjustments to the overall sound of the speaker system (EQ) when played at a low volume. This ability to retain a rich and balanced sound on the digital piano, regardless of volume, ensures the highest sound quality.