Hi
I have been a Burmester fan for a long time (early 90s) . My last system was all Burmester electronics (Preamp, amp, DAC, Transport, Phono Stage) . They remain IME among the best gear one can purchase. The whole line up is excellent well built and to last. When you buy in Burmester it is for the long runThe 911 was originally designed in 1991.... 21 years ago, . Service is exemplary and reliability stunning. They simply work and work under conditions that would destroy most other gears ...
the 911 MKIII mono, I haven't heard. I know you can easily bridge the 911 but I don't know what the monos are about... I am rebuilding my speakers based system and likely it will be mostly Burmester ... As for amps I have a monster non_Burmester in my sight depends on the speakers I will ultimately get ... else back to the 911 MKIII ... I am thinking every day that I should get an 808MK V (originally designed in 1980 !!!) and be done with preamps for the next 20 years