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If I'm not mistaken, The Auto Calibration Systems do all of that don't they?
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My understanding of the Auto EQ systems is that they don't do a very good job (if at all) in the important 15Hz-80Hz band. This is where modal resonance determines low frequency behaviour and also the area we target with REW and a BFD. Many report fairly good results with first using the AutoEQ system, then using REW and a parametric equalizer to take care of the missed low end.
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Hook up the mic that is supplied with it at a distance to where you are sitting. (sweet spot) Then just sit back and let the 990 do it's magic. While the 990 did a reasonable job at calibrating I purchased a Galaxy CM-140
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One of the problems with replacing the supplied mic used in an Auto EQ system is that the Auto Eq software has the calibration file for the supplied mic embedded in its code. When you substitute another mic/meter, that calibration is incorrect. I wonder if you used REW after using the Auto EQ system (with the old mic and then the new mic) to note the differences or similarities of the results......
brucek