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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
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Test Bench: B&C Speakers 21DS115 21-Inch Woofer | audioXpress
Test Bench: B&C Speakers 21DS115 21-Inch Woofer | audioXpress
Stormbreaker a B&C 21DS115 Subwoofer Solution | AVS Forum