MB Quart RA1-750.1 Reference Series mono subwoofer amplifier — 750 watts RMS x 1 at 1 ohm BMW direct fit aptX/aptX HD

aptX/aptX HD

replacing the factory sub with the sound you expect from Alpine

cutout diameter: 9

Alpine crafted their HDZ-65CS 6-1/2" 2-way component speaker system for listeners in search of excellent audio quality in the car

50 watts RMS x 8 + 160 watts RMS x 2 bridged at 4 ohms

MB Quart RA1-750.1 Reference Series mono subwoofer amplifier — 750 watts RMS x 1 at 1 ohm BMW direct fit aptX/aptX HDProduct info: mono subwoofer amplifier 300 watts RMS x 1 at 4 ohms 500 watts RMS x 1 at 2 ohms 750 watts RMS x 1 at 1 ohm variable low pass filter (50 250 Hz, 12 dB octave) variable bass boost (0 12 dB at 45 Hz) switchable subsonic filter (Off 25 Hz, 12 dB octave) wired remote bass level control included More info: preamp and speaker level inputs speaker wire to RCA adapters required for speaker level input DC offset sensing turn on with speaker level