Boss Audio Systems Ava1210 7 Band Pre-amp Car Equalizer With Gold-plat
If engine noise is audible, check the ground connection on all units and in the audio system. Front Adjustable EQ Band Frequencies: 125 Hz, 500 Hz, 3.5 kHz, 12 kHz. RCA Input; Subwoofer output. Inputs: Dual 2 Channel Source.