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Nice one. This shows the software doing it's job well. An immediate answer regarding the bottom end. Plus some scary stuff at the top. That looks like the sound is arriving at the mic at different times causing comb filtering. I assume you have used the mirror to be sure there are no first reflection points? Fuzzmeasure does ETC and all that other good stuff also, but the mirror is a lot easier! If you are driving both speakers, the sound from the two tweeters will arrive at the mic at different times unless it is perfectly central. I believe only Spock has this final Front Ear..... sorry ;-) I recommend driving only one speaker at a time, then average the results. FM has great averaging facilities. Drive two speakers when investigating the modes.
Historically and I concur there is a wisdom that HF roll off in the CR leads to excellent translation. Bruel and Kjaer and others had suggested curves. e.g. +3dB around 100 falling to -3dB around 10K. See also 'Understanding RTA' at studiotips.com
DD
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