The QS speakers need to have at least 4" of clearance on the top and bottom to allow room for the drivers (that is what brent from axiom told me). I am not sure of side clearance.
I think you can get a custom stand height, but there is a maximium and that may be it. Do you already own the def tech speakers? which ones do you have/will be purchasing?
Also, I personally would not have the QS8's painted the color of the wall if they are going to be on stands. A painted speaker on a black stand would look funny IMO. If you get them painted I would put them on the wall.
