Premium Series Active Crossover Features:

Premium Series full-range amps include variable Hi-Pass & Low-Pass active crossovers. The PAB1200.1D 1-Ch / Mono-Block amplifier offers an adjustable Low-Pass (35Hz to 250Hz), a power saving Subsonic filter, and an adjustable Phase Shift adjustment. The MB Quart Premium Series phase control allows synchronizing the phase relationship of the subwoofer system to the other car audio speakers.
Premium Specs