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![Box Plan] 18-inch Band Pass Subwoofer Box - YouTube](https://i.ytimg.com/vi/qjfCY403PMs/maxresdefault.jpg "Box Plan] 18-inch Band Pass Subwoofer Box - YouTube")
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Amazon.com: ASC Single 18" Subwoofer 1" MDF Universal Fit Vented Port Sub Box Speaker Enclosure : Electronics
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Amazon.com: ASC Single 18" Subwoofer 1" MDF Universal Fit Vented Port Sub Box Speaker Enclosure : Electronics
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