DB Drive SPEQP Speed Parametric Equalizer 4 Band Adjustable Parametric Equalization Variable Subwoofer Output Control Main Aux Input Selector Left and Right AUX Input Sensitivity Controls Gold Plate RCA Input Connectors 4Bands Of Adjustable Parametric Stereo Equalization Volume Gain With Up To 8V Of Output Variable Subwoofer Output Control Main/Aux Input Selector Left and Right Aux Input Sensitivity Controls