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@bq
lining the box with a layer of foam deadens the internal reflections by absorbing and disrupting them, the theory being that you don't want reflected soundwaves coming back and meeting the soundwaves generated by the speaker as it would muddy the sound. You also don't want the bass frequencies washing out the high end so you also separate the tweeter from the midrange/woofer.
You don't totally fill it, just line it and maybe something to disrupt the soundwaves