What John says is correct. Ray3, who hopefully will come by later tonight, has his QS8s on shelves supported on either side of the downfiring driver by plumbing fixtures he picked up somewhere. I have mine temporarily propped up on 3 paperback books to each side of the downfiring driver. Not exactly the best setup, but they sound fabulous. You only need about 3 inches of clearance for the bottom driver to work properly.
If you end up putting them up there on the shelf, I think moving them away from the side wall by at least 3 to 6 inches, or angling them toward the listening area, would help the dispersion some. In general, the QS8s are pretty forgiving when it comes to placement.
