Alphasonik AS12DF 12" 1500 Watts 4-Ohm Down Fire Shallow Mount Flat Enclosed Sub woofer for Tight Spaces in Cars and Trucks, Slim Thin Loaded Subwoofer Air Tight Sealed Bass Enclosure - Walmart.com
Pioneer TS-W310D4 Champion Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Pioneer TS-W311D4 Champion Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Pioneer TS - W311D4 Subwoofer - L.A. Car Accessories
Pioneer TS-W311D4 Package - Walmart.com
Pioneer TS-W311 - 12" Subwoofer
Jual Speaker Subwoofer PIONEER TS-W311D4 2COIL 12INCH 1400W ORIGINAL | Shopee Indonesia
Pioneer TS-W311D4 Subwoofer in an L-Ported Box Bass Test - YouTube