DriSentri 7band Car Audio Equalizer EQ Frequency Adjustable RCA Input for Portable Devices + Subwoofer Output

["Seven equalization bands (50Hz, 125Hz, 315Hz, 750Hz, 2.2kHz, 6kHz, and 12kHz), each frequency is adjustable from -12 to + 12dB (-18 to +18dB for subwoofer frequencies)","Subwoofer output uses a built-in 35-250Hz","Three stereo RCA outputs to drive front, rear, and subwoofer audio amplifiers","An auxiliary stereo RCA input for use with portable devices, such as an MP3 Player or DVD player","Separate controls for master volume, subwoofer volume (sub level), front/rear fader, and selection of main or auxiliary inputs"]