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What are the differences between a subwoofer and a woofer? Which is better? Can I use a sub instead of awoofer or vice-versa? - Quora
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Active vs passive subwoofer.
One unit (not pair) |15 Inch Woofer for Bass Compensation of Open Baffle or Cabinet | W-15 - Lii Song (Lii Audio), unique speaker, amplfier, quality and cost-saving parts for HiFi DIY
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