Boa Gnomus 8 Basskiste 20 cm Woofer - BOOMTOWNSHOP
Amazon.com: Gravity 2X 6.5 Inch 600 Watt Car Audio Subwoofer w/ 4 Ohm DVC 6.5" Sub Pair - Feature Dual Voice Coil, Thick Magnet, Design for Car, ATV, Van, High Performance Car Show : Electronics
Custom Ported Sub Enclosure Box for 1 15" Massive Audio BOA 151 Subwoofer ~BIRCH | eBay