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


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 I went from a FPB 300 to the 400CX and am very happy with the improvement.
Why don't you have the 600 upgraded to CAST and you would have a better amp than the 400?

Thanks for the swift responses.

I had considered upgrading the 600 to CAST but as I live in the UK the upgrade cost is fairly excessive - not really a valid option.

Shipping would be excessive I suppose.