Audio Control THREE.2 In-Dash Pre-Amp Equalizer/Subwoofer Crossover with Dual Auxiliary Inputs In-Dash Pre-Amp Equalizer / Subwoofer crossover with Dual Auxiliary Inputs In-dash Pre-Amp Controller Two input channels and two, four, or six channels of output Stereo and Para-BASS equalization controls On-board pre-amp line driver up to 13 volts peak Master volume control and fader Selectable illumination - Cool Blue or Hot Red LED's! Compact  DIN chassis