The PAC-LC-1 remote amplifier level control, used to adjust an amplifier"s power level, stereo, equalizer or crossover volume form the dashboard or other remote locations. It adds sub-woofer level controls or balances a multiple amplifier installation. Fine tunes the volume of any RCA line level signal you wish to control. Compact housing allows the unit to be mounted virtually anywhere so control is at the user’s fingertips. Simple in and out connections, no additional wiring needed. Great for a sub amp volume control.