Since I initially posted here a few years ago, I made plenty of changes and I cleaned it up a bit. This is my main system combining pure 2-channel and surround sound when needed. The MC-601 monoblocks drive the XRT-28's with ease. I have tried a few McIntosh preamps (SS and Tube) and have settled on the C45. A recent addition of the XLS-12 subwoofer gave the system a little more depth on the lower end and I'm very happy with the result. I play all types of music, mainly classic rock, 80's pop and jazz. For surround, two MC-7106's control all my surround speakers. The only piece I'm still looking for is a McIntosh MLD 7020 to complete my collection. If you have one for sale, please contact me.
Just noticed your revived thread regarding the 275 mono question and just wanted to shout out to a fellow XRT owner. i have the earlier XRT 20s, and can only imagine what your set up sounds like! Looks like you came up with a great solution to driving those 28's! Enjoy!