My opinion, from Best (of those in this discussion) down:
Krell FPB 300-cx ties with Pass 250.5 ties with FPB 300-c
Krell FPB 200C
Krell FPB 200
Pass 250
There is a significant difference between the 250 and the 250.5. The difference between the 300-c and the 300-cx? I can't hear any difference with my Watt/Puppies (I bought the 300-c). I previously owned the FPB 200. I have also owned the Pass none .5 version. FWIW I agree that for the Levinson amps (331/2/3/4 etc. . .) that the .5 versions are notable better than the none .5 versions. I owned the 331.5.
Pass and Krell both make excellent amps and I could live with either the 300-c(x) or the 250.5 and not be disappointed. Both are great companies, all around.
Krell FPB 300-cx ties with Pass 250.5 ties with FPB 300-c
Krell FPB 200C
Krell FPB 200
Pass 250
There is a significant difference between the 250 and the 250.5. The difference between the 300-c and the 300-cx? I can't hear any difference with my Watt/Puppies (I bought the 300-c). I previously owned the FPB 200. I have also owned the Pass none .5 version. FWIW I agree that for the Levinson amps (331/2/3/4 etc. . .) that the .5 versions are notable better than the none .5 versions. I owned the 331.5.
Pass and Krell both make excellent amps and I could live with either the 300-c(x) or the 250.5 and not be disappointed. Both are great companies, all around.