I am currently using a Classe’ Audio DR-9, Dave Reich’s first A/B design. I bought two, each from two different sellers, with the intention to run them dual bridged mono and still plan to do so. As usual, this did not turn out to be so simple. The first DR-9 had been fitted with a refurb kit from Classe’ a few years ago and sounds ridiculous. One of the best sounding SS amps I ever heard. Open, dynamic, detailed, with beautiful timbre and a strong & tuneful bass. The second DR-9 is an original box stocker. It sounds nice, but much less open and dynamic than the first. So much so that whichever channel I use the "refurbed" unit on draws the imaging way to that side. So, for now i am using the one DR-9 in stereo. I need to contact Classe’ and see if they can make the second DR-9 sound like the first. If so, I honestly think that I will be set for life running these two dual bridged mono with the Thiels.
I much prefer the sound of this "special" DR-9 to the Krell up to venue-correct volume, but put SRV "Tin Pan Alley" on my TNT or some big tympani/gongs SACD cuts on with the Krell, crank it up, and you will look like that guy in the old Maxell ads, even after the music stops!
https://www.bing.com/images/search?q=Maxell+Ad+Blown+Away&view=detailv2&&id=3DD28D15A33C...
Actually, more like this:
https://www.bing.com/images/search?q=Blown+Away+Maxell+Commercial+HD&view=detailv2&&id=0...
I found a forum discussion on the KRS-200s that might be of interest to/entertainment for you:
http://www.apogeeacoustics.com/oldforum/006911-2.html
Best to you Thomas,
Dave