Audiocontrol Three.2 Car Audio EQ 4 Band Equalizer 24db Crossover Aux 13 Volts

3-band EQ: +/-12 dB at 125, 1,250, and 10,000 Hz. Para-BASS EQ: +/-12 dB at 40-80 Hz. preamp/equalizer and subwoofer crossover. 2-way Linkwitz-Riley crossover (24 dB/octave at 90 Hz). line driver increases output up to 9.5 volts RMS (13 volts peak).

eBay