JL Audio XD600/1v2 works great just no longer need. mono subwoofer amplifer400 watts RMS x 1 at 4 ohms (600 watts RMS x 1 at 2 ohms)variable low-pass filter (50-500 Hz, 12 or 24 dB/octave)switchable subsonic filter (30 Hz, 24 dB/octaveClass D amplifier design with NextD switching amp technologydifferential-balanced inputs eliminate noise coming from your vehicle's electrical systemAdvanced Rollback Protection System prevents thermal shut-down