Definitely mono.
I think your biggest problem will be sound bouncing off the walls at a fairly high amplitude, and a delay short enough to be really bothersome.
- Same with the ceiling, but the walls will be much closer, hence more energy reflected and more likely to be within the Haas window.
No offense to Rayma, who suggested a layout that is very often used, but that will cause all sorts of phase cancellation all over the place, and a HUGE problem with time-alignment of the subs as you move down the room. (Unless I don't understand what he wrote.)
If it were me, I'd put whatever you're using dead-center of the back wall, as high as possible, pointing downward towards maybe the 2/3 mark down the room. (Adjust with your ears.) Obviously, use a speaker that has less than 90 degree horn width. I'd fly the sub, too, but that probably isin't viable for you, so on the floor but also centered. Your main concern is a clean, tight dance area, with a "power ally" for the LF.
Ideally, I'd put a second speaker in the ceiling, maybe halfway down, with a time-sync'ed delay on it. Then lower the volume of the back speaker accordingly. This would not only lower overall side reflection issues, but make it more pleasant for the folks closer to the DJ.
Your idea of using "3 or 4 mounted down the middle of the ceiling" could work, but I suspect that if the ceiling isn't very dead, this will cause yet more phase issues.
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After all that, if the owner is willing, you could think about treating the room. For starter, some 4" thick, 4-5 lb per square inch mineral wool on the walls would do wonders. Doing the ceiling would also tighten the room, and maybe let you get away with that "3 or 4 speakers" idea since there would be less floor-ceiling-floor reflections going on. At least above 100 Hz.
I think your biggest problem will be sound bouncing off the walls at a fairly high amplitude, and a delay short enough to be really bothersome.
- Same with the ceiling, but the walls will be much closer, hence more energy reflected and more likely to be within the Haas window.
No offense to Rayma, who suggested a layout that is very often used, but that will cause all sorts of phase cancellation all over the place, and a HUGE problem with time-alignment of the subs as you move down the room. (Unless I don't understand what he wrote.)
If it were me, I'd put whatever you're using dead-center of the back wall, as high as possible, pointing downward towards maybe the 2/3 mark down the room. (Adjust with your ears.) Obviously, use a speaker that has less than 90 degree horn width. I'd fly the sub, too, but that probably isin't viable for you, so on the floor but also centered. Your main concern is a clean, tight dance area, with a "power ally" for the LF.
Ideally, I'd put a second speaker in the ceiling, maybe halfway down, with a time-sync'ed delay on it. Then lower the volume of the back speaker accordingly. This would not only lower overall side reflection issues, but make it more pleasant for the folks closer to the DJ.
Your idea of using "3 or 4 mounted down the middle of the ceiling" could work, but I suspect that if the ceiling isn't very dead, this will cause yet more phase issues.
----------
After all that, if the owner is willing, you could think about treating the room. For starter, some 4" thick, 4-5 lb per square inch mineral wool on the walls would do wonders. Doing the ceiling would also tighten the room, and maybe let you get away with that "3 or 4 speakers" idea since there would be less floor-ceiling-floor reflections going on. At least above 100 Hz.
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