Upgrade from Krell FPB 600 to Krell FPB 400 cx???

Hi,

I currently use a Krell FPB 600 power amplifier with a Krell KCT pre-amplifier. I have the opportunity to buy a Krell FPB 400 cx but will not be able to listen to it at home so cannot compare it to my existing FPB 600.

Has anybody got any experience of the FPB 400 cx? Is it alot better than the FPB 600?

If I get the FPB 400 cx I will be able to use CAST connections to the KCT which I am assuming will offer advantages.

Any thoughts welcomed.

Paul.