I've noticed many people saying that the surrounds should be roughly 7' from the floor. Would placing them at 7' be much better than using then stands that are designed for the qs4, which is currently the height they're at now. And if the 7' from the floor is much better, why are the stands no where near this height? I understand that the QS surrounds are very forgiving when it comes to placement, but am curious to this height recommendation that I've seen alot of people make.