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Attached are before and after REW graphs
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crg, I believe that you are using the old Radio Shack meter calibration file. Best to use the new one that associates with your model found
here. The files are new in the last month after Sonnie had his ECM microphone professionally calibrated and we re-did the files.
I really think your low frequency response can be bettered by equalization. You have a nasty peak around 28Hz and others that could be easily corrected with a BFD. There's nothing wrong with correcting very low frequency peaks with equalization. Certainly well executed acoustic treatment improves response over a larger physical area than does EQ, but at very low frequency peaks (such as you appear to have), the size of the treatment would be huge. A cut filter with a matching Q and inverse gain would help reduce the peak.
When you post your graphs use a vertical scale of 45dB-105dB. The RadioShack meter is not reliable above 5Khz, so no use using a horizontal scale that goes to 30KHz. In this case where we are looking for effect of a low frequency mode, perhaps use a horizontal scale of 15Hz to about 500Hz (and measure same to look for low frequency modes).
brucek