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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
Amazon.com: Sound Town 21" Raw Woofer, 600 Watts Pro Audio PA DJ Replacement Subwoofer (Low Frequency Driver) : Musical Instruments
Sound Town 21" Raw Woofer Speaker, 600 Watts Pro Audio PA DJ Replacement Subwoofer Low Frequency Driver (STLF-21120) - Walmart.com
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Sound Town 21" Raw Woofer Speaker, 600 Watts Pro Audio PA DJ Replacement Subwoofer Low Frequency Driver (STLF-21120) - Walmart.com
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B&C Speakers Adds 21”, 10” Midbass, HF Drivers and More for Prolight+Sound 2016 | audioXpress
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STLF-21500A | 21" Cast Aluminum Frame High-Power Raw Woofer Speaker, 1 – Sound Town