D
dlaloum
Senior Audioholic
From that Audyssey link:What is MRC?
Midrange compensation is an intentional dip in the 2 kHz region where the vast majority of tweeter-to-midrange crossovers are. In that region the tweeter is at the low end of its range and the midrange at the high end of its range and the directivity of the speaker goes through major changes. We found that if that region is equalized to flat, the change in direct to reflected ratio that happens because of the directivity variations causes voices to sound harsh (among other things). So, we have this implemented in the Audyssey target curve. With MultEQ Pro you can choose to turn it off, but we don't recommend it. This notion was observed 40 years ago by BBC speaker designers in their studio monitors. They designed their speakers with this "BBC dip" intentionally in the speaker response.
The thing to keep in mind - the MRC makes an assumption about your speakers, about the crossover and about the directivity etc...
This may or may not apply to your speakers - the better your speakers are, the less likely it is to be applicable.
It definitely caused a degradation in sound with my speakers, and being an early version of Audyssey (circa 2015, XT32) there was no mechanism to turn it off, without buying the US$1000 "pro kit" and then a licence to run "pro".
I suspect that if it wasn't for that "feature" I would still be in the Audyssey camp, instead of having jumped ship to Dirac!