Room is 16'x'12'x8. It has 2 entry ways. I can go into the garage or attic, but, I would prefer the garage as I don't want to wake up the kids in the back of the house. The room is on a slab, the exterior walls are brick and interior are drywall. I would like to stay with 2 drivers to start. I use a single 12" sub now and it does the job nicely so I guess 2 15" drivers should easily do the job. Budget, well, its going to be a piece by piece project but I can't go too crazy with it.