Why not mount the height channels high on the walls, and angle them downward? In our HT I mounted the speakers 13' high on the front and side walls, and then angled them toward the MLP...sounds great IMO. I also watched a video on Audioholics where in Europe this is the way they mount height channels, and that it is preferred over ceiling mounting unless you are running a Auro3d VOG channel. When they run a VOG channel it is the only one mounted in the ceiling.
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