So you're suggesting I point my SM155s along the side of the equilateral triangle to the listening point? I would probably have to re-run YPAO.1poorguySince the SM155’s are to drool for I would. I don’t know the off-axis drop-off but knowing the design I’d say there could be some but not as much as some others. You may have to tweak the cross-over points in the speaker but maybe not. Worth trying though. And, yes, I’d rerun the YPAO.I still kick myself for not getting a pair when they were on sale a few years ago. If ever there was a speaker suitable for a large setting off the amp the 115s are they. Mine are already about 6" or so from the wall. But pointed straight out. Separation about 14' or so (and at least 20" from the side walls). And the sub (down-firing) is a good 12" from the corner.If we follow the equilateral triangle placement then your seating area is 14 feet from the mains. Mine was about the same and I found if I moved the speakers more towards each other the sound improved (went from 14 feet down to ten speaker to speaker). Don’t know how the 115s would react as would smaller mains (I have Infinity Reference). However, since the frequency of the SM115s is 34-20,000 Hz it does produce a long bass wave and having that aimed at the seating could give a clearer bass than if it were bouncing off the side walls.My mains are aimed with the right main facing the left hand side of the seating area and the left main at the right side. It seems to work for me. As for the downward firing sub because it is essentially a 360 degree source it is more affected by corner echo than front firing. Since your great room is that large maybe you need that enhancement. I’d experiment moving it further from the corner to see if there is a change in bass in the room.If you do re-aim the speakers let everyone know how it works for you.How are the new surrounds working out? MichaelR
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