3 ft³ @ 35Hz Ported MDF Subwoofer Enclosure Box for Single 15" Car Audio Woofer | eBay
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Amazon.com: QPower QBOMB10V Dual 10 Inch Vented Port Subwoofer Sub Box, 1 Cubic Foot per Sub, Tuning Frequency 40 hZ, with Bedliner Spray : Electronics
How to tune a Dual Subwoofer Enclosure: Ported Subwoofer Design - YouTube