SUNDOWN AUDIO E-15 V.3 D4 15" 500W RMS DUAL 4-OHM CAR SUBWOOFER BASS SPEAKER NEW | eBay
5 CORE 8" Full Range Subwoofer Car Audio Speakers, RMS 50W Peak 500W, 4 Ohm Car Vehicle Audio Full Range Drivers, Wide Range DIY Loudspeaker Woofer Replacement WF 890 DBL - Walmart.com
Rockville K5 W15K5S4 15" 2000w 4 Ohm Car Audio Subwoofer Sub 500w RMS CEA Rated! - Rockville Audio
NVX 500W RMS Dual 4 ohm 10" Car Subwoofer - SSA® Online Store
Pioneer TS-A300D4 12" 500W RMS Dual 4-Ohm A Series Subwoofer
Pioneer TS-D10D2 D Series 10" Dual 2-Ohm 500W RMS Car Audio Subwoofer DVC NEW | eBay