Pioneer TS-W301R 12" 4-ohm subwoofer at Crutchfield
Pioneer TS-SW3002S4 12" 1,500W Shallow Subwoofer with Single 4" Voice Coil - Walmart.com
Amazon.com: Alphasonik AS8DF 8 inch 600 Watts 4-Ohm Down Fire Shallow Mount Flat Enclosed Sub woofer Slim Thin Loaded Subwoofer Air Tight Sealed Bass Enclosure : Electronics
Amazon.com: Pioneer TS-M800PRO 8-Inch PRO Series High Efficiency Mid-Bass Car Speaker Drivers - Pair (Discontinued by Manufacturer) , Black : Electronics
Amazon.com: Pioneer TS-SW2002D2 8-inch Shallow-Mount Subwoofer with 600 Watts Max Power : Electronics
Pioneer TS-M800PRO 8 inch Mid-bass driver
Amazon.com: Pioneer TS-SW2002D2 8-inch Shallow-Mount Subwoofer with 600 Watts Max Power : Electronics
Pioneer A-Series Shallow-Mount Pre-Loaded Enclosure (8-Inch Subwoofer) in the Mobile Audio department at Lowes.com
Amazon.com: Pioneer TS-A300D4 12 Inch 1500 Watts Max Power Dual 4-Ohm Voice Coil A Series Car Audio Stereo Subwoofer Loudspeakers / Free Alphasonik Earbuds : Electronics
Pioneer TS-A2000LD2 Shallow-mount 8" subwoofer with dual 2-ohm voice coils at Crutchfield
Pioneer 1200 Watt 10 Inch Subwoofer Champion Series DVC Car Bass Sub | TS-W261D4 - Walmart.com