You are talking about two completely different levels of performance. The KAV - Krell Audio Video is just that, a blending of audio performance (to a lesser degree) with video systems. This series is by no means Krells best efforts in pursuit of sonic perfection. The FPB Series is on a whole different level of performance. I have owned a multi-channel KAV (300 w/ch @ 8 ohms), KAV 500, a Krell FPB 200 and a FPB 300-C. Now it should be noted that the KAV units I owned were all multi-channeled and in my opinion no multi-channel amp can perform anywhere close to a comparably prices two channel or mono amp. This being said, the FPB Series were noticeably better than the KAV Series in every regard. If your choice boils down to one or the other and any factors outside of performance don't come into play, I would strongly suggest the FPB Series (in your stated case the 350 MCX) over the KAV unit. Though I would suspect you will be paying close to twice the money.
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