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Is it the room mode frequency you're looking to lose?
I don't know what that means but I think so.
If you run a frequency generator you should be able to hear if it peaks at a specific frequency, then maybe you can EQ it out. If it's that you'll never be able to treat the room effectively. You could try toe-ing in the speakers and pulling them out from the wall.
Are your speakers bass reflex?
Why are you hogging all the bass?
Is it the room mode frequency you're looking to lose?
How are you getting so much bass?