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Skar Audio SK3X12V Triple 12" Universal Fit Ported Subwoofer Enclosure with Angled Rear Firing Design - Walmart.com
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Got this massive subwoofer box with triangle ports for 3 - 12” subwoofers for $50 at goodwill! : r/subwoofer
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Amazon.com: ASC 312H Triple 12" Sealed Subwoofer Rear Angle 3 Sub Box Stereo Enclosure : Electronics
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Down4sound PRO-FAB HD3- 2 12 Sub Box | Dual HD 12-Inch KERF Port Subwoofer Enclosure Box - Down4Sound Shop
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