<p>The Stereophonic Optimizer&mdash;a new kind of headphone experience</p>
<p>When using headphones, the Stereophonic Optimizer lets players enjoy the dispersed sound heard when sitting in front of an acoustic piano. With the Stereophonic Optimizer, Voices sampled from acoustic pianos appear to come from the body of the instrument. This provides a comfortable, natural experience that removes the drawbacks of performing with headphones.</p>
<p>Acoustic Optimizer</p>
<p>The speakers attached to the case exhibit a phenomenon in which, if nothing is done, the volume of the sound will increase due to the resonant frequency of the material. However, installing Acoustic Optimizers with the same resonant frequency within the body of the piano suppresses this resonance. This improvement of the sound is something that has only been possible thanks to Yamaha&lsquo;s thorough knowledge of the internal acoustic characteristics of musical instruments.</p>
<p>Intelligent Acoustic Control (IAC) - for comfortable practice at home</p>
<p>At low volumes, bass and treble used to be difficult to hear; however, YDP-S34 is equipped with Intelligent Acoustic Control (IAC) which adjusts the sound automatically, allowing players to enjoy balanced piano tones at any volume level.</p>