I am building a box out of either fibre glass or a hard wood, going for SQ whats the best liner for the inside of the box? Ive seen lots of products but dont know if any of them actually work such as the dynamat one or blackhole.
I think he's talking about acoustic dampening. If this is for car audio, don't bother because you won't notice the difference. For home audio, my standby is fiberglass insulation. Eats up standing waves like candy.