B&C 21DS115 is a very high power 21" subwoofer for speaker subwoofer systems- B&C 21DS115 21" Subwoofer has a lightweight neodymium magnet - B&C 21DS115 21" high power speaker for speaker subwoofer
Two GSG Full Marty Classic 21" B&C 21DS115 21" Professional Subwoofers! | AVS Forum
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B&C 21DS115-4 21" Neodymium Subwoofer 3400 Watts Program 4.5" Coil 4-Ohm Pro Sub 848864050621 | eBay
Outdo B&C 21DS115 and upgrade to modular subs - Speakerplans.com Forums - Page 6