For the first time in a Hi-Fi receiver the R-N803D is equipped with the Yamaha Parametric room Acoustic Optimiser (YPAO) a famed technology used in Yamahas AV receivers. It measures the shape of the room the material of the wall and the position of the speaker and then automatically adjusts the sound to create the ideal response and sonic quality. The unit also features other advanced YPAO functions including YPAO™-R.S.C (Reflected Sound Control) which actively corrects the important early reflection sounds that greatly influence sound quality and YPAO Volume which applies exceptionally high-precision EQ (equalisation) with 192 kHz / 64-bit operation. The result? You can create an ideal listening environment right in your home just like that of a professional audio listening room. Moreover you can control the YPAO feature and display the analysis results by using a MusicCast app.