Mobile surround sound processorDecodes 5.1 Dolby Digital and DTS signalsDolby Pro Logic II - multichannel processing to stereo sources3 optical digital inputs8 preamp outputs: Front 1 (full range tweeters), Front 2, rear, center/selectable subwoofer and mono subwoofer2 RCA audio inputsNavigation sound inputAi-Net input for connecting a compatible Alpine component such as a DVD playerAlpine CD changer inputGraphic equalizer7-band parametric equalizerMediaXpander3-step bass compensation