Krell x-series, are ther any sonic benifits?

I wonder the same thing? I have a krell 600c and think personaly if they just gave themselves a honest power rating and put an x in the name. It is only slightly different cosmetics. Maybee the output devices are different, if so I'll bet there is a slight difference, but not much.

well I just sold my krell fpb 200c and I dropped it off at krell for the buyer to have the upgrade done and krell said there is a big diffrence between the two. If there was no diffrence why would they have an upgrade????????

Lev335: Why would they have an upgrade? How about the high end 2 channel audio business is dead, even more dead in this economy. How else can you squeeze money out of your customers if no one is willing to buy a new amp? AH UPGRADE FEES! I am not saying that nothing is done in the upgrade, I am saying that Krell created this upgrade to generate revenues. Why on earth would anyone buy a new amp when they could come here and buy them discounted or slightly used for 50% off?