i think the 'optimum' position is not necessarily 6ft off the ground, but rather, just a little above and behind the listening position. about 1ft to 2 ft i think is best. due to wall limitations, i had to put my QS8's at 7 feet, which is about 3 feet above the listening position.. but they sound fine.. no probs at all.. goes back to the whole dispersion idea.. the QS8's just sound good almost anywhere.
and to answer your question.. i dont know for sure, but every HT room i have ever seen, had all the speakers at the same height.. so i would think if you put the surrounds at 5 feet, the rears should be the same..
i am just guessing here, so you might wanna get more advice.
bigjohn
