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The problem is the uneven decay time of the various frequencies. You could say you have a "high freq" problem but if you attenuate the highs you'll be missing one hugely important point: the lows are cancelling out at different amounts around the room, and you can hear massive difference from one part of the room to another.
You need to treat the lows so that they are not so uneven. Then figure out what to do about the highs.
Bass traps. Bass traps. And then, add a few bass traps.
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