Originally Posted by AustinJerry
Keith, I am confused. Back when you still had your Onkyo and were using the Pro Kit, were you defeating the MRC? And since upgrading to the Denon and now using the consumer Audyssey calibration, you have reported on a number of occasions that you think the sound has improved over what you were getting with Pro. Even to the point that you have hypothesized that Audyssey has implemented some enhancements without telling anyone. But your current calibration is using the MRC. Can you see how this might be viewed as a contradiction? Or, heaven forbid, could the current calibration sound better because the MRC has been reinstated?
There are some misunderstandings in your comments, Jerry.
I used Pro with and without the MRC dip enabled. On movie soundtracks I could never really hear very much difference between them TBH. My objection to the MRC dip is more conceptual. I do not want an arbitrary dip imposed on my expensive speakers at the whim of someone's (mistaken) belief that the BBC designed-in this dip over 50 years ago in order to correct some perceived problem around the frequency region where the crossover of a speaker handles the transition from tweeter to midrange driver unit. For one thing, the BBC never encountered that issue, despite what Audyssey say. The BBC Dip was designed to correct a problem with the driver cone material of the day. Here we are 50 years later, using speakers with totally different drivers, designed with the aid of computers, using components from the 21st century, also designed with the aid of computers. Audyssey has no idea how my speakers have been designed and I prefer to follow their maker's wisdom and experience in designing a speaker that does not require deliberately induced distortion in order to satisfy the preferences of Chris K and his team. (And it is a matter of their subjective preferences: they repeatedly say that the MRC dip "sounds" better or "smoother" or "less harsh". They have offered no supporting measurements to objectively justify their subjective claims AFAIK
For the record, I never hypothesised that XT32 has been improved surreptitiously. What I said is that the latest version of XT32 in my Denon X5200 is achieving the same sonic and measured results as I used to get from using Pro. This is true. I have not the faintest idea if this was true for the version of XT32 in my former Onkyo 5509 because I started to use Pro before I had learned how to use REW, so I never measured one against the other. It is quite likely that XT32 has always given the same audible results as Pro, but I can only speak for the XT32 in my Denon vs Pro.
The current calibration (with XT32 alone) does not "sound better" than the former calibration using Pro. It sounds the same. And it measures the same.
This is what Audyssey have to say about MRC, from their own 'Ask Audyssey' site:
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 last two sentences are a figment of Audyssey's imagination, as quick research into the BBC Dip will verify.