Krell x-series, are ther any sonic benifits?

Kichoi, please keep us informed. I would be keen to find out what improvement a $500 upgrade offers. BTW, do you use the KCT preamp ? If so, does Krell provide any upgrade to CAST II for it ?

Actually the 600C upgrade to 700Cx would cost whopping $2000... According to Krell, it will operate exactly the same as the new 700cx once the upgrade is done. It will have minor cosmetic changes; one on the face plate to make it identical to the new onces and a new sticker with 700cx ID for the back.
I have not asked them about the CAST II. I will do so.

In case I forget, please send me a note in couple of weeks. The amp is scheduled to be back in 1.5 week.

ericbee: great point but being such a large company like they are in regards to sales because they arent a big company in general. I would think that they would stand to lose many loyal customers if the upgrade was a small change in sonic quality. I sold the krell and went back to Levinson

Actually the upgrades will cost $500 per chassis if the units were bought October of last year or later, $1000 per chassis if bought earlier and $2000 if the amps was bought used or from an unauthorized dealer.

This last weekend I listened to the 400cx driving KRELL LAT 2s pinched-out at 80Hz while a pair (yes, a pair) of KRELL Master Reference Subwoofers handled the bass from 80 down, and it didn't suck. We didn't have a 300c to compare, and the 400cx was under 48 hours young. It does run hot like FPB product always has, and it was every bit as smooth, incredibly dynamic, and detailed as previous product. The only shortfall, in my jaded opinion, was the fact that we were using a DVD Standard and an HTS II (albeit CAST from the HTS II) up front. I feel there is no substitute for the KRELL 28c/KCT combo in such a system, and it was noticeable. The CAST II catches up to the CAST circuitry already present in the 28c, KCT, MRA, and MRS. The only upgrade to the 25sc, 28c, and KCT is a sliver center pillar top trim piece like that on the top and bottom of the center pillar of the X Series amps. The new cosmetic looks good, but it is subtle.