The JBL A600 is a mono subwoofer amplifier using Class D topology that delivers 350 watts RMS x1 at 4 ohms and 600 watts RMS x1 at 2 ohms. It includes a variable 32-320 Hz low-pass filter, 0-12 dB bass boost at 45 Hz, and a 0/180 degree phase switch for precise sub integration.

Speaker-level inputs, RCA preamp inputs, and signal-sensing turn-on allow integration with factory or aftermarket head units. The package includes a wired RBC remote with a 16.5 foot cable, speaker-to-RCA adapters, four 30A fuses (two installed/two spare), mounting hardware, logo badge, and an owner manual.