3000 Watt SPL | GZHW 30SPL Green Edition - Ground Zero Audio
Amazon.com: Ground Zero Mid Woofer Pair 16 cm Gzck 165Spl for Car 165 Mm Diameter High Efficiency Middle Bass for Excellent Sound : Electronics
Ground Zero GZHW 38XSPL-D2-38 cm Passive Subwoofer with 3500 Watt (RMS: 1500 Watt) : Amazon.de: Electronics & Photo
Amazon.com: Ground Zero Iridium 16,5 cm / 6.5" Subwoofer - 4 Ohm - 100 WRMS : Electronics
Amazon.com: Gravity 2X 8 Inch 1200 Watt Car Audio Subwoofer w/ 4 Ohm DVC Power 8' Sub Pair - Feature Dual Voice Coil, Thick Magnet, Design for Car, ATV, Van, High Performance
Amazon.com: Ground Zero Iridium 16,5 cm / 6.5" Subwoofer - 4 Ohm - 100 WRMS : Electronics