Input Stage High Level (Speaker) Low Level (Pre): FL - FR - RL - RR AUX IN Output stage Low Level Pre (default): Front TW L/R, Front WF L/R Rear L/R, Sub, Center Connections From / To Personal Computer: 1 x USB / B DRC HE: Audio controls and Memory / Inputs selection Optical / AUX select: Optical In / Aux wire control + 12V / GND enable Memory A / Memory B: Memory A / B wire control + 12V / GND enable Software/PC Requirements Microsoft Windows (32/64 bit): XP, Vista, Windows 7, Windows 8, Windows 10 Size W x H x D mm / (in.): 191 x 34 x 131 / 7.51” x 1.33” x 4.76” Hertz sound processor.