I am currently using a set of Infinity direct radiating speakers for my 7.1 surround in the rears and have seating at 3 feet (back row) and 6 feet (front row) from them. I personally do not hear much of a differance between either row of seating as far as 7.1 surround goes. Although saying that the first row of seating is the sweet spot in my HT.

Later
Phil