@DJBonoBobo how's your setup coming along? Some furniture changes have me considering surrounds above ear level as per your original Q, so as not to irritate people on the ends of our couch. I'm also searching for CBT that have any chance whatsoever of getting a passing WAF score. I swear step 1 of building line arrays is "imagine the ugliest speaker possible,
perhaps something that looks like it came from the last level of Doom".
I have installed the KH80 on the wall around 35cm above ear level. But in my situation i would not do it again. They feel too high/not right, not immersive. If i could start over i would place them at ear level or only a little bit higher.
Listening distance is around 150cm. They are a bit too much in the back though, angle is around 125 degree, which is more than it should be. YMMV.
For me the whole surround-thing has not worked well. I almost never use it. Stereo sounds better in most cases. I tried upmixing stuff and also playing a few surround-mixes i had. But nothing sounded really good. I planned on listening to a lot more surround music, but i am very disappointed/frustrated it is almost impossible to listen to this in a legal way, if you don´t want to buy physical discs and also don´t own an AVR (DRM shall burn in hell).
I configured the fronts and the surrounds both with the MA1 system, but of course as 2 stereo setups. Maybe they don´t fit. I also tried Dirac live, but that gave me a nasty lag/delay. So, i probably try again as soon as the MA1 supports surrounds systems. Maybe i also will give Dirac another shot some day.
I don't know what of my experience is translatable to others. Maybe my installation is just too bad or has too many compromises.
PS: Just for the sake of completeness, I don't know if I had already written it in this thread: The center didn't work either, I sold it. Phantom center was better in all cases I tested.