Boss Audio BX552 3-Way Pre-Amp Electronic Crossover with Remote Subwoofer Level Control
2/3-Way Pre-Amp Electronic Crossover w/ Remote Subwoofer Level Control2/3 Way CrossoverVariable Low Pass Filter and Variable High pass FilterSubwoofer Phase and Base Boost ControlFront, Rear & Sub InputFront, Rear & Sub OutputsRemote Subwoofer Control