Hifonics BRUTUS BRZ15D4 Woofer, 700 W RMS, 1400 W PMPO - Walmart.com
Amazon.com: Hifonics BG-4000.1D Brutus Gamma 1 Channel Super D Class 4000 Watt Car Audio Sound System Subwoofer Speaker Amp Amplifier with Gravity Magnet Phone Holder and 4 Gauge Kit Red Bundle : Electronics