15 portedI was thinking about fiberglass but i hear it can mess up the voice coil does polyfill?How should i mount the polyfill so it doesnt blow out the port?Something better to use?**my box is a lil small for my sub‘s recommendations which is why i was thinking polyfill or fiberglass unless something better is out there.
loose polyester is fine. it normally comes in sheets, simply spray some ados on the inside of the box and stick the polyester, or just use a gun stapler. fiberglass is fine, i normally wrap it in some real thin cloth to prevent stray fibers finding their way into the voice coil. All you should need is about 1-2 polyfill around the box. at bare minimum you can get away with only dampening three of the six surfaces, so for each undamped surface, the opposite surface is damped, eg top, back, and one side. I always do all surfaces inside. as for the port so long as there arent any loose chunks then it should be fine
