depending on your room acoustics you will not need a sub. I was shocked to find that my 4 Pi's do better than all but one of the subs I used to sell. (& I worked in a nice shop, not mass market) Bass like this will rattle anything within 30 feet. If you build the box solid, it will vibrate less than most pieces of your house (assuming it isn't concrete). I think you could put a TV on my speakers. You can get metal cylinders to cement onto magnets & shield them for theater use. Build one 4 Pi in a good shape for this, maybe 28" tall and 33" wide (just guessing). you could slighty slope the front to aim the horn at listening height.

sounds like fun, I might do 5 channel some day. I bet 6 or 7 Pi for the rear would be amazing. Hmmmm.

Thomas