I closed on a forclosed home today. The living room is 15 x 11. My three 828 cabs will go across the long side front with 816 511/811 hanging for side surround and 605's or 600 for rear surround. My question is has anybody built sub horns exiting up through the floor? Obviously the waf is not a problem. It"s a 7.1 system and the room will probably be as dead as I can get it.