@ mapman, Hi, whats good to me about krell, some sounded good and some did not win me over, what i am saying is, not only do the model lines of krell sound different from one to the other, in most cases, the model within the model line sounds different from one another, one example of this is that the krell fpb 200 sounds alot different than the fpb 600, one of the most apparent difference is that the fpb 200 has deeper, bigger bass than the 600, thats were the line is drawn, the 600 does every other audiophile attributes much better, now with the evolution E series amps, they are class A/B amps, to were the 700cx is class A, Krell revamped the amps when people complained about the excess heat that does not bother me!, so the heat sinks are now in the chassis, alot less parts, alot less power on stand-by, green friendly!, The E series is class A untill the signal gets to the out put, then it is class B, this was the only way they could achieve this was going to class A/B, some may prefer the sound of the class A/B amps, some may prefer pure class A, they do sound alot different, in some ways the evolution E amps do sound better, in some they do not!, This depends on like anything else, your preferance and what you are tring to achieve with your sound, cheers.