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Join Date: Jan 2001
Location: upstate NY
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No, "height" speakers don't use reflections. They're mounted up high and are pointed down toward the audience seating area, usually toward the main listening position (the one where you sit, centered between the front main speakers). Alternatively, some people prefer to mount them so they point toward the opposite side of the seating, with the Right Front Height speaker pointing toward the left side of the seating, for example.
In other words, you could mount Front Height speakers on your front wall (where the TV is), at a height which is above the top of the windows, with Rear Height speakers mounted similarly on the back wall.
Reflecting speakers (also called Dolby Atmos Enabled speakers) can't work at all with vaulted ceilings like that. The reflections off the ceiling don't go anywhere near the seating.
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped