subwoofer enclosure

[ekah]

will putting sound deadening inside finished enclosure increase loudness
or stabilize enclosure better?

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[marc2112 10+ year member]

No but polishing the interior will increase air flow.

 

[THATpurpleKUSH 5,000+ posts]

No you don't put sound deadening inside the enclosure.

Sound deadening is for controlling panel resonance not to add rigidity. It's designed for sheet metal and other thin substrates not wood.

Ideally you want the enclosure to be as hard as possible. You can reinforce the interior with wood hardener or fiberglass resin but it's really unnecessary unless you are in a competition and chasing every tenth of spl possible.