JBL BassPro 12 Ported powered subwoofer with 12" sub and 150-watt amp at Crutchfield
MR.DJ RR-MON21SUB 21 IN 8000 WATT PASSIVE SUBWOOFER – Mr Dj USA
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JBL CS1214 1000-watt, 12" Car Audio Subwoofer, Black - Walmart.com
JBL SRX928S Dual 18-inch Powered Subwoofer | Full Compass Systems
Jbl Subwoofer - Best Buy
JBL SRX828SP Dual 18 Inch 2000 Watt Powered Subwoofer | American Musical Supply
Yorkville Synergy Series dual 21 inch - SA221S
One unit (not pair) |21 Inch Woofer for Bass Compensation of Open Baffle or Cabinet | W-21 - Lii Song (Lii Audio), unique speaker, amplfier, quality and cost-saving parts for HiFi DIY