BX55 2 3 Way Pre-Amp Car Electronic Crossover with Remote Su

Crossover Slope 12 dB / Octave, Variable Subwoofer Phase 0 – 180 Degrees. BOSS 2/3-WAY ELECTRONIC CROSSOVER. Front High Pass Filter 65Hz to 4.5 kHz, Rear High Pass Filter 65Hz to 4.5 kHz. Variable Subwoofer Filter 40 Hz – 4200 Hz, Variable High Pass Filter 65 Hz – 4.5 kHz.

eBay