Depends on your question, of course, but I have no knowledge of the Krell. The current Classe and the Krell 707 will not downsample PCM, afaik, but they will not accept DSD. I do not know about the 1900.
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I went through a lot of processors (classe ssp20, theta casanova, cal ssp2500, krell hts7.1) over the last 15 years and I'm really impressed by the clarity, transparency and dac section of Krell. However, since the departure of Dan Agostino, Krell reliability has gone down big time. Having said that, if you dont own any Krell gears, go with Classe.