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Testing the room would be helpful. From the height of your ceiling you
should have a nice null around 150 hz in the middle vertically, probably
quite near your head when seated. Not deep bass but a frequency used
by just about every instrument.
As Glenn says a cloud should help, both for reflections and reducing the
effect of the vertical mode.
Your room height is exactly twice your length which is not good as it
doubles your troubles with the modes. Shortening the length to 13'7"
would be the best you could do.
Paul P
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