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4) B&C 21SW152-8 21" Neodymium Subwoofer 8 Ohm DJ Live Sound 4000Watts Bass Sub | Reverb
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LAVOCE SAN215.30 21" Subwoofer Neodymium Subwoofer
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Yorkville Sound SA221S Synergy Array Series Dual 21" SA221S B&H
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Gs Audio Neo 13 Compact Subwoofer / 10-12-15-18-21" customizable 84mm voice coil
YORKVILLE ES21P 2400 watt Powered Subwoofer | EMI Audio
YORKVILLE ES21P 2400 watt Powered Subwoofer | EMI Audio
DS18 PRO-BX Neodymium 21" Woofer 6000 Watts MAX 6" SVC 1-Ohm
Dayton Audio HTS545HE-4 Kraken 21" High Excursion Subwoofer with 5" Voice Coil 4 Ohm
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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
