AudioControl Matrix Plus Black Six Channel Line Driver with Remote Level Control Input Features: High signal voltage capability: 13 volts peak output, 24dB of gain, Six channels of input and output, Balanced differential inputs, Low-impedance outputs, Optional Remote Level Control (ACR-1), PFM Subsonic filter, Output level controls, Ultra-low distortion, ultra-quiet operation, Selectable ground isolation, and Optimum voltage indicator LEDs.