I don't know the newer products you are concerned with, but the KSAs are true classics which many say were the best products Krell evermade. If you can afford to keep them I would no matter what you do next.
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I have had the 403 and now the 403e, I was also lucky enough to be @ Krell's demo of the 402 v 402e @ CES a couple years ago, the 'e' series are much smoother and cleaner, everyone in the room was equally impressed.
FWIW I have also owned a KSA 300 s and find the new 'e' series Evo's far more musical.
I have not compared the 400 mono's to the 403 or 403e however
I heard 202 in a dealer's setup only recently, sorry for my late reply.
I did not have the opportunity to compare them side by side, however 202 said to have just a little thinner sound, a Phantom a somewhat fuller. Phantom has some more control over the lower registers and sound somewhat more open.
Having said that however, I found even the 202 extremely open, detailed, fluid and fast with very good control over the lower regions.
When the price difference is great and this is of concern I think you can better go with 202, otherwise the Phantom is the better of the two and it should, regarding it's price.
I already upgraded from Evo 400 to Evo 400e.
Heard side-by-side and I found it a really recommended upgrade on all parameters, deeper and more articulate lower, mids are more musical engaging, higher tones are finer exposed. Overall the sound is more open and detailed with more clarity.
Indeed Krell Evo works very fine with Ref5SE.