Amazon.com: Sound Town 15" 450W Raw Woofer Speaker with 4" Voice Coil, 100 oz Magnet, Replacement Woofer for PA/DJ Subwoofer, 4-ohm (STLF-1504-4) : Musical Instruments
W3854 Universal 38cm 380mm 15" Inch 8 Ohm 400 Watt Max SubWoofer Woofer 8053323550860 | eBay
Subwoofer No. 1592 Plans – Joseph Crowe
Pioneer TS-WX1210AH - 12-inch Ported Enclosure Active Subwoofer with Built-in Amplifier - Walmart.com
3 Skar Audio EVL 15" Sub up Port Back Subwoofer Box Plans | CustomLowz