**********This dash mount amplifier level control is used to adjust amplifier gain, power level, stereo, equalizer or crossover volume while driving*****Adds subwoof level control to any head unit or balances a multiple amplifier installation. Enables volume balance in any part of an amplified system*****Stereo RCA input and output. Simple in and out connections, no additional wiring needed*****Perfect for balancing the system to change music styles, control your sub-woofer output, you can set the subwoofer on maximum gain and then vary the knob to taste as per genre or media*****This amplifier controller offers high-quality signal transmission with RCA composite cables,