Audi A3 2003 Onwards JL Audio 8" 150 Watts Car Subwoofer Custom Bass Box Kit
BOSS Audio Systems CXX12 Chaos Exxtreme Series 12 inch Car Audio Subwoofer - 1000 Watts Max, Single 4 Ohm Voice Coil, for Truck, Boxes and Enclosures, Use With Amplifier - Walmart.com
Audio System X15-1100 12" 550 Watt Dual-4-Ohm Kevlar Car Audio Subwoof - Showtime Electronics
ZXI 6.5" High Excursion Subwoofer Quad Stacked Magents 300 Watts Rms D
BOSS Audio Systems P12SVC Phantom Series 12 Inch Car Audio Subwoofer - 1600 Watts Max, Single 4 Ohm Voice Coil, Sold Individually, For Truck Boxes and Enclosures, Hook Up To Amplifier
Wicked C.A.S. > Audi > AUDI A3 Magic Box 10 / 12 / 13 SUB BOX SUBWOOFER ENCLOSURE