I powered the five main speakers with an amplifier rated to deliver 100 watts per channel. I placed the front towers 3 feet from the front wall of my 12 x 22-foot room and 2 feet from the side walls, toed in toward the listening position. I mounted the surrounds on wall brackets slightly above ear level and very slightly behind the listening position. I admit they may have been slightly too close to the wall for rear-ported speakers, but stands won't work in my theater. The subwoofer was directly behind the left front tower, about 18 inches out from the walls.
Voices range from high-pitched children to a deep baritone.