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So I built an 18" sealed subwoofer. Build guide and bonus picture in album! More info in comments. : r/DIY
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Amazon.com: Bbox Single 10 Inch Subwoofer Sealed Enclosure - Car Subwoofer Box & Enclosures - Premium Subwoofer Box Improves Audio Quality, Sound & Bass - Red & Black Spring Terminals - Charcoal : Electronics
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