Just to try to clarify what I was trying to say....
Although it is emotionally gratifying to have and use, even the best non-distorting, linear, analog electronics can't fix audio inaccuracies originating from other sources. That's why I'm biased toward the use of Audyssey or one of the other comparable packages.
More extensive comments:
Unless you actually measure your system's acoustics (using a calibrated microphone and spectrum analysis software like REW), you can't really know the accuracy of your system. (By "system", I mean all of the components of your listening environment: the source, cabling, preamp, amp, speakers and room.) Our hearing is easily biased by expectation, what we've gotten used to, and the rather poor accuracy of our recollection of subtle audio details. As adults, we tend to remember the "gist" of what we've experienced and not the actual details.
I've been horrified by the plots of the audio response of some of the expensive, supposedly high quality speakers reviewed in Stereophile
. Often the speakers were given high praise in the accompanying subjective reviews, but too often the plots looked like mountain ranges or saw blades, with peaks and valleys everywhere.
Audio electronics which doesn't include one of the room equalization packages simply can't correct for those kinds of speaker defects, nor can passive room treatments. Many of the external audio equalizers (like those from Behringer) have limitations, too, and the best pure, direct, linear electronics paths simply can't do squat to fix them.
I'm definitely not saying that your audio system has those kinds of issues, but without measuring it, you can't know for sure.
And those beautiful room treatments won't tell you, either. Unless they howl and leave the room, of course.
Shedding must be a serious problem at times, but they obviously have other qualities which more than compensate for the disadvantages!
Still, in spite of any pursuit of more accuracy, how your sound system makes you feel is the important thing.