JBL CLUB A600 Mono subwoofer amplifier 600 watts RMS x 1 at 4 ohms 1000 watts RMS x 1 at 2 ohms 2000 total watts RMS x 1 at 4 ohms when strapped to a second Club A1000 Class D amp technology Variable low-pass filter (32-320 Hz, 12 dB/octave) Variable bass boost (0-12 dB at 45 Hz) Phase switch (0,