I would recommend firing them from short to tall wall. The reason for this is 2 fold. One you will get a slight gain from going from a smaller area (volume), to a larger one. You effectively decreasing pressure through the room and will have the highest pressure behind the speakers. An added benefit to this is that by creating known pressure areas like this it is easy to acoustically treat them. The other reason I would fire to the high side, is that if you were firing to the low side you would get a reflection point off the ceiling behind you. It would be a long reflection time and would make the speakers less clear. You could treat the ceiling to get rid of the problem, but the easier solution is to just not work against nature and fire from short to long wall. Hope that helps.
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