Alpine 11-band pre-amp/graphic equalizer. Continuous adjustable subwoofer crossover, both low-pass and high-pass, from 50Hz to 120Hz, with a slope of 18db per octave. Subwoofer level control, phase switch, stereo/mono switch.from Consumer Electronics Store http://cestore.net/car-vehicle-electronics/car-electronics/car-audio/equalizers/Alpine-3331-11-band-graphic-equalizer.html?pid=B01BPQO3FU
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