JBL MARINE A600 600 Watts Subwoofer Marine AmplifierThe JBL marine A600 mono subwoofer amplifier delivers 600 Watts RMS using a Class D amplifier design to ensure high output and minimum current draw. Speaker level inputs allow this amplifier to integrate into almost any system, even one using your marines factory radio. You can use the low pass filter and variable bass boost to maximize the performance of your subwoofer and enclosure, while a phase switch ensures that the bass will blend well with