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Richard Heyser crossed this bridge for all of us in the 70's. His findings are as simple as you can't EQ a reflection. You have time, frequency and amplitude. EQ addresses freq & amplitude. The higher the frequency the more troubles you'll get into with EQ. In small room, you can EQ for a specific location and might improve the response...more likely you'll simple trade problems or make your space less accurate.
You CAN very successfully use specifically applied subtractive EQ with a sub and reduce major modal resonance.
Today's wave of Digital Room Correction systems (Ergo, Audyssey, JBL's, etc..) all make efforts to address time domain. All are MOST effective in a well treated room with early relfection points tamed (RFZ) and speakers/ears are properly positioned.
Personal observation on engineers with both live mixing and studio chops: I've found that these rare people who are adept at both can deliver solid mixes out of rooms with reflections problems...I suggest their ears are more used to interpreting/filtering the good/bad elements of a space and maybe even unknowlingly, adjust.
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