I spent 10 years selling the original digital room correction product (SigTech), primarily in the 2 channel market. (a 6 channel solution cost about $18,000!!). The product was not overly successful for a number of reasons, but the one I found both interesting and frustrating was the reluctance of the high-end 2 channel guy to "put anything between the source and the speakers".
And near as I can tell, not much has changed. Virtually all (a few well known exceptions) SSP's have some form of room correction (some better than others) and most home theater enthusiasts (high end or otherwise) are reluctant to purchase a new SSP that does not have some form of correction. As I talk to other 2 channel audiophiles (and dealers) most are still (a) ignorant of the capabilities of digital room correction and/or (b) still want nothing to do with it.
The benefits of room correction (done properly) are so much more obvious than virtually every other "upgrade" one can make (and in some cases, a lot less costly), I am amazed that this technology for 2 channel has just not taken off. A 2 channel Tact (2.0), for example, cost less than $6K if I recall and will do wonders in 98+% of all rooms. But audiophiles seem to have no problem spending more than that on things like cable elevators, speaker wire, interconnects, equipment racks ... you name it. And while those may (or may not) be worthwhile improvements, all pale in comparison to the improvements that can be had by well done correction.
And yes, I believe that passive treatment should be the first option, but in my experience, even rooms that are properly designed and built can benefit from this technology.
So I pose the following for you two channel guys (and girls): What has been the reason for not investing in this technology?