Feature●30V bipolar switching power supply | 20Db headroom eliminated signal overload | selectable stereo RCA inputs, Main or aux | front, rear, & subwoofer RCA outputs | master volume/level control●Independent subwoofer level control | independent fade control | variable 60hz-90hz subwoofer low Pass Crossover●Blue backlit control knobs | s/openings ratio: 115Db | THD: 0.05% | stereo separation: 82Db | frequency response: 10hz-15khz | Max output voltage: 8VDescription 1/2 DIN 9‐Band Graphic EQ w/ Subwoofer Level Control | 30V Bipolar Switching Power Supply | 20dB Headroom Eliminated Signal Overload.