dwchiang, pmulvey,

I have M60s about 7 ft. apart, I sit about 8 ft from each one of them, and their rear ports are 8 to 10 inches out from curtains that hang behind each one. If I'm not mistaken, I believe Alan has stated that you can get away with as little as 3 inches of space between the rear ports and the wall. I would think a little more space would be better, but if you can get at least that much, you should be OK. This holds true for all the ported speakers.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton