I can't tell you I have personal experience with the 200. I have had 600c and 650mc and now the 750mcx in my system. I have not sent amps back for upgrade, preferring to purchase them new, though that is irrelevant to this discussion.
Cast mcx is a totally different paradigm for Krell. It loses ALL of the slow, gray, thick, grainy sound Krell has been associated with in the past while maintaining it's traditional strengths. It is extremely neutral tonally, any topend grain is gone. Speed is increased significantly. Now I do not feel need to use Transparent Pixl's or even spikes under my amps to fix those previous issues. This not unsubtle audible difference is immediately heard and is a seachange in the Krell sound. I know from my experience with the 650 to 750 that it's now almost exactly like a cross between the $60k Boulder and the Spectral 360's. Speed, delicacy, smoothness, tonal perfection! It can be delicate and nuanced, unlike previously, then maintain ALL the low end and midrange dynamic magic when needed. Amps have been my own personal grail over the past 5 years, and I've tried, owned and listened carefully to over a dozen of the very best, though by no means not all hiend amps, including Lamm 1.1's, Rowland MC6/8ti, Boulder, Spectral, BelCanto, Audio Research VT100, VT200, Ref300 and Ref600, Atmasphere.
I've always, even before mcx felt that everything else just could not handle the dynamic envelope of live music, and maintain the body and solidity of image like the Krell. Krell makes just about everything else sound broken and allows the suspension of disbelief that allows you to believe you're hearing live music. The only caveat is I have not spent a lot of time with Triode or OTL tubes of the same class, though Atmasphere was very, very good; speakers that I have run have always demanded high current amps, and the heat and maintenance issues have almays made me hesitate. I'm already paranoid enough without having to worry about biasing/tubes etc. I've always felt that the Krells when spiked under transformers and conditioned properly on dedicated 30A lines always sounded to my ears like 600+watt triodes, anyway. This comes in handy also if, like me you have a dual role system, i.e. hi-end home theater.
BTW, if you are running cast, especially the KCT premp, this is a no brainer. Mcx was built by Krell to catch up to the 2nd generation cast output of that preamp. It's very, very good. Mcx also optimizes balanced inputs by speeding up non CAST connections to make them sound much faster than non Mcx non cast connections.
This generation of Krell will cause a lot of people to rethink their previous opinions/bias over Krell products. It should.
Cast mcx is a totally different paradigm for Krell. It loses ALL of the slow, gray, thick, grainy sound Krell has been associated with in the past while maintaining it's traditional strengths. It is extremely neutral tonally, any topend grain is gone. Speed is increased significantly. Now I do not feel need to use Transparent Pixl's or even spikes under my amps to fix those previous issues. This not unsubtle audible difference is immediately heard and is a seachange in the Krell sound. I know from my experience with the 650 to 750 that it's now almost exactly like a cross between the $60k Boulder and the Spectral 360's. Speed, delicacy, smoothness, tonal perfection! It can be delicate and nuanced, unlike previously, then maintain ALL the low end and midrange dynamic magic when needed. Amps have been my own personal grail over the past 5 years, and I've tried, owned and listened carefully to over a dozen of the very best, though by no means not all hiend amps, including Lamm 1.1's, Rowland MC6/8ti, Boulder, Spectral, BelCanto, Audio Research VT100, VT200, Ref300 and Ref600, Atmasphere.
I've always, even before mcx felt that everything else just could not handle the dynamic envelope of live music, and maintain the body and solidity of image like the Krell. Krell makes just about everything else sound broken and allows the suspension of disbelief that allows you to believe you're hearing live music. The only caveat is I have not spent a lot of time with Triode or OTL tubes of the same class, though Atmasphere was very, very good; speakers that I have run have always demanded high current amps, and the heat and maintenance issues have almays made me hesitate. I'm already paranoid enough without having to worry about biasing/tubes etc. I've always felt that the Krells when spiked under transformers and conditioned properly on dedicated 30A lines always sounded to my ears like 600+watt triodes, anyway. This comes in handy also if, like me you have a dual role system, i.e. hi-end home theater.
BTW, if you are running cast, especially the KCT premp, this is a no brainer. Mcx was built by Krell to catch up to the 2nd generation cast output of that preamp. It's very, very good. Mcx also optimizes balanced inputs by speeding up non CAST connections to make them sound much faster than non Mcx non cast connections.
This generation of Krell will cause a lot of people to rethink their previous opinions/bias over Krell products. It should.