Amazon.com: Pyle 8 Inch Car PA Woofer - 500 Watt High Powered Car Audio Sound Component Speaker System w/ 1.5" Kapton Voice Coil, 55-6 kHz Frequency, 89.2 dB, 8 Ohm, 40 oz Magnet - PylePro PPA8 , Black : Electronics
BOSS Audio Elite 10" Dual-Voice-Coil 8-Ohm Subwoofer Black BE10D - Best Buy
STLF-1804-8 | 18" 450W Raw Woofer Replacement Speaker, 4" Voice Coil, 8-ohm – Sound Town
2 Rockville RVP18W8 2400w 18" Pro Subwoofers 8-Ohm Raw Sub Woofers 90 Oz Magnets - Walmart.com