Agree. Even the heresy III, which uses the new horn used in the cinema and premier series (with better directivity), has a 90x60 dispersion pattern. The guy has a 7.1.4 setup I believe, even with the speakers properly aimed, somebody is probably going to be more than 30 degrees off axis vertically, I just thought it was hilarious the guy went through all that trouble to mount them to the ceiling. He then proceeded to ask avsforum whether or not it was overkill, since the guys over at Klipsch forums told him it was.
http://www.avsforum.com/forum/91-audio-theory-setup-chat/2837745-these-klipsch-heresy-height-atmos-speakers-overkill.html
I have reference II series mounted to my ceiling in a 5.1.2 config, difference is, I have them aimed so that the seating area is fully covered horizontally and vertically, off axis seats are off axis with respect to the horizontal pattern, so it all works out mostly okay. The RB 10 has a pretty well controlled 90 degree horizontal dispersion out to about 10khz, however, the II series horns get pretty ugly vertically off axis.
Unfortunately, Klipsch hasn’t made any bookshelves with threaded mounting hardware in their new line, otherwise that’s what I’d be using. Based on the polar maps, the reference premier series would actually do very well for atmos, Dolby’s HT atmos installation guide recommends ceiling speakers have a +-45 degree dispersion pattern from 100hz-10khz (-6dB), the RP series has a dispersion of +-45 degrees up to 14khz, and actually does okay out to about 60 degrees at 10khz.
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