planepics wrote:
My heights are on opposite walls, just below the ceiling and angled down at an angle. I only have one seating position and Audyssey (room correction software) on my Denon receiver adjusts everything, and the Atmos effects are, um, effective. I have my speakers in ROUGHLY an equilateral triangle, but sometimes experiment with tow-out or toe-in. Some speakers perform better, soundstage-wise, if they're not pointed directly at the listener, some require it.
If they are all housed in the same speaker cabinet, there isn't much choice. There is a technology employing elliptical reflectors that create more mid-range and high range beamwidth. That can deliver exceptional audio imaging. In that case, it is better to have the speakers aligned to 90 degrees from the side walls and specific distances apart relative to the listener. The imaging is so good that it is better to NOT have surround sound. Surround sound is only useful for action movies to make you feel you are immersed in the environment. Since orchestras, bands and singers are in front of you, surround sound is wasted.