Originally Posted by blazar
What bothers me about EQ is the perception that it is a cure all for acoustics issues. Some folks have gotten into the "room correction" software craze to the point of skipping a lot of other basics. It is simply a lot easier to market software and EQ products as a "quick fix".
My view is that calling Audyssey, MCACC, YPAO or any other such took "Room Correction" is a horrible disservice to the world of audio. Many of the bad things that rooms do can't possibly be corrected at a single point in the system. Acoustical problems need acoustical, not electrical solutions.
Frankly, we don't know for sure if or what they correct without a lot of individual investigation.
They do a lot of different things, such as setting crossover frequencies and time delays, as well as adjusting frequency response.
Their real function on the best day of their lives is to make an attempt to optimize the overall system performance at a single point in the AVR with a fairly broad brush.
That all said, I don't see a need to throw the baby out with the bath water.
Possibly the most valuable service they provide is their initial system check out function. Detecting crossed, misrouted, and possibly shorted speaker wires is a huge benefit and at the least they seem to be very effective and positive at doing that.