Hi, I'm the lucky owner of a set of Selah RC5G speakers, which I recently chose to augment with a pair of powered subwoofers (I live in a loft whose main listening room is about 12,000 cubic feet, otherwise these excellent speakers would certainly not need any bass enhancement!) My question is, what is the best way to (temporarily) seal the speaker's port to "convert" them into "sealed" speakers? I've read in numerous places that sealed speakers better integrate with subwoofers, reducing the speakers' deep bass output while also creating a shallow roll-off to improve integration. I say "temporarily" because I don't want to do anything that cannot be reversed, damages the speaker, or decreases their re-sale value. Any thoughts? Thanks in advance!