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B&C 21ds115 4ohm 15hz tune box


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I also wonder if a single piece of .75”/18mm plywood is strong enough for such a big and powerful driver.  I usually use a minimum of 2 layers of .75” plywood for my subwoofers and usually 3 for larger drivers (18”+). If the driver is moving the baffle it is mounted to, you will lose efficiency/output. 

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