Originally Posted by markus767
I was thinking about 37 speakers installed every 30° around and above the main listening position.
You put the zero in the wrong place; should be more like 370 speakers installed every 3 degrees. But seriously...
I was thinking about the comment by Harvey Fletcher (known as the father of stereophonic sound) that is mentioned at the begining of Atmos intro video
: 'it doesn't matter how many channels there are so long as there is the illusion of there being an infinite number'
Not being wealthy, the challenge for me when it comes to home audio is finding the point of diminishing returns: at what point will adding more speakers to my system result in minimal to negligible improvements in localization and imaging stability? In other words, how few speakers will let me get away with the illusion of there being a dome of speakers around me?
With a 7-speaker layout, I feel that I have left/right and front/back reasonably covered. Maybe a pair of wides or a 5-speaker front soundstage would make for greater stability in the front hemisphere, but I don't know if the benefit is tangible enough to be worth the cost. So the only direction left to go is up. But how many height speakers?
I'd start with grid of at least 4 overhead, spread away from the median plane (listener's centre line) to minimize imaging reversals and create phantom imaging above with some directionality. Angle-wise, the 4 speakers can split the difference between the fronts and sides and between the sides and rears. It should also allow for some phantom imaging between the surrounds and heights.
After that, I'm not sure which other speaker locations would make the most noticeable difference. Considering we already have receivers supporting 11 channels (Denon 4311), seems like a workable starting point.