AccuGroove Whappo Grande Bass 21" Subwoofer – AccuGrooveLLC
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
Eminence NSW6021-6 Tour Grade 21 inch neodymium subwoofer speaker - Eminence NSW6021-6 21 inch subwoofer speaker. The Eminence NSW6021-6 21" subwoofer speakers. The NSW6021-6 handles 2,500 watts RMS.
8005AS 21 Inch Powered Subwoofer 21 Inch Concert Speaker - Buy 8005AS 21 Inch Powered Subwoofer 21 Inch Concert Speaker Product on Alibaba.com
Amazon.com: B AND C 21IPAL 21-Inch 5000W Power Soft Woofer, Black, 20.00 x 10.00 x 20.00 : Electronics