So I made some cans out of 6" pvc and installed Polk Audio db 650's in 'em - out the back they sound great, however, in the boat they sound kinda "boomy" and muffled...I DID NOT put any dampening material in the can...should I do this? and what should I use, just fiberglass batt insulation, something more rigid? Sorry, no pics, our digi went in the river a while back
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