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D4S SUBWOOFER BOX
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How to build - Wedge Subwoofer Box Enclosure! SIMPLE & LOUD!? - YouTube
![Sound Ordnance B-24 Dual 12" Band Pass Subwoofer Box | eBay](https://i.ebayimg.com/images/g/hvYAAOSwAQdjguOM/s-l1200.jpg "Sound Ordnance B-24 Dual 12" Band Pass Subwoofer Box | eBay")