Audiotek At-eq500 Eq500 5-Band Graphic Equalizer with Subwoofer Output and Cd/Radio Selector Switch Specification: 5 Equalization Bands / Tone Adjustment from -12dB To +12 dB / Low Pass filter with selectable Frequency control Three stereo RCA output / Auxiliary Stereo RCA Inputs / Input Selector Master system volume / Fader function for front and rear Channel Sub Volume Adjustable for Subwoofer channel / Led Display for power On and Off