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I am about to mount a sub in a sealed (and carpeted) enclosure. My question is how sealed does it need to be? The carpet runs all the way to the edge of the hole cut for the sub. I figure this will allow a small amount of air in an out during play due to it not being a flat surface the sub in butting up to. Should I seal this area in some way? The reason I am questioning this is the sub has an o-ring around the mounting flange which leads me to believe if in a "sealed" enclosure it needs to be air tight. If it does need to be air tight then do I need to seal the terminal cup on the back of the box also? TIA.