Interestingly, I have what I believe to be the same amps (serial number 2645 and 2646) as earlmarc - probably with a few more hours burn in time on them.
Frankly, I was so happy with the Khartago stereo unit I had before this one, that I didn't ask what the model name, or even internal compenentry was of these amps I now have. Klaus just told me they are second to only full out Stratos Mono's....it's funny, but with almost any other maker I'd want to know more details to know if I was getting a good 'deal'. With Klaus, you just know you will.....and have the comfort of an unbelievably long warranty to boot.
I think my requirements for an amp are less finicky, or fine tuned than earlmarc and others...I simply want it to sound effortless for the 8+ hours daily I have tunes on, and have boundless reserves to meet dynamic peaks in my 12 x 15' room.
This is the first amp I've ever owned that has met both criteria 100%....tho, each of the prior amps I've owned have been less expensive.
The grab-'em-by-the-balls character of this amp is truly virtuous. My Maggie MMG's, notoriously difficult to play dynamically (delicate 48" ribbons are less impactful than circular cones) - almost pass for cone sound now (in all the right ways). Prior to this, the best 'amp' that drove these were the diminuative JVC F10 Hybrid Digital receiver....the lower end control that 'digital' amps have over most traditional SS units really helps control those long ribbons. The Khartago Mono's maintain that lower end without letting it get wooly , with an abundance of everything else. These speakers really sing now.
btw - I'm having the MMG's modded by Jeff over at Sonic Craft now - outboard crossovers with Alpha-Core inductors and Sonicaps, rewired with Alpha Core wire (the only wire that consistently sounds like an upgrade to me, no matter the cost), upgraded connectors in a nice wood box. With the Mye stands, I'll have the world's most expensive MMG's....with only $1300.00 into it for what I hope to be a world class pairing with the Khartago Mono's.
I simply love these amps and I believe they will be the foundation of my system for many years to come (unless that damn Klaus finds another way of siphoning off my earnings