JL Audio TwK™ 88 System Tuning Processor - CAR TUNES STEREO,49WXA36001 KICKER Warhorse 3600.1 RMS Mono Class D Subwoofer,49WXA36001 KICKER Warhorse 3600.1 RMS Mono Class D Subwoofer,JL Audio TwK™ D8 Digital Signal Processor 8-channel DSP with,JL Audio TWK-88 System Tuning 8 Channel Digital Signal