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So, is it assumable that equalization can be more practical, cheaper, easier for room mode decay (ringing) as well as FR below say 80 Hz than room treatment?
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Well for sure. Certainly equalizing to remove modal resonances is what REW is all about. The listening area can be measured at mutliple positions and the results averaged if you like or you can choose a single position for the best results. The effective area will depend on the frequency of the mode. Acoustic treatment can improve the response over a wider area, but at those low frequencies <100Hz, the size of the treatment would be ridiculous. For less than 100Hz, use EQ. Above that, to about 500Hz (so I understand), use room treatment.
brucek