i know that in a perfectly square room...with plain white walls, even with a $1,000,000 sound system, the music is going to sound like complete and utter garbage. even though this doesn't have anything to do with building a sealed box...if you ever go to a recording studio, the studio has no parrallel walls (not even the ceiling) and different textures on the wall, floor, and ceiling. this is to prevent sounds from cancelling eachother out. also, when you walk to the back of the room (i guess where the tuba and bass instruments would play) the bass is amplified and your voice sounds lower while you go to the front where flutes and the such are played, the your voice sounds higher because of an amplification of higher frequencies. interesting.