Knipex 8802180 Alligator Water Pump Pliers Rj45 SANYO HR 3U 14033 SANYO HR 3U 4 band preamp EQ with front rear active crossover featuresLine Driver circuit delivers 9 volts of preamp level signal through the RCAsAudio input selector for switching between head unit and another audio sourceInput level controls for both the car radio and any media device to ensure identical volume levelsMaster volume control of the SPL level for both sound sourcesFront to rear dual amp fader2 audio inputs with level matchingSelectable 12 dB high pass crossover and low pass sub outputSelectable for mono or stereo subwoofer setups45 Hz sub bass control120 Hz mid bass control Knipex Alligator Water Pump Pliers