1. Great for a sub amp volume control. 2. Used to adjust the power level, stereo, equalizer or crossover volume form the dashboard or other remote locations of an amplifier. 3. Adds sub-woofer level controls or balances a multiple amplifier installation. 4. Compact housing allows the unit to be mounted virtually anywhere so control is at the user fingertips. 5. Fine tunes the volume of any RCA line level signal you to control. 6. Simple in and out connections, no additional wiring needed. 7. Connect the RCA from the output of this Controller to the amplifier, and wire the car stereo output to the RCA input of this unit. 8. Specification: 4 RCA: 2 RCA input & 2 RCA output Frequency Range: 150Hz - 40Hz Volume Gain Range: 0db to -12db
