Exchange Krell KAV-250a for a Pass Labs X-350?

Yes, that is the pendulum Gregm. I do not know yet. But the general consensus is that the Krell may be a bit sterile or have a sound. I am just looking for my next upgrade path if I need one. I have tried a number of preamps, tubes and SS, and I have landed with the NAD Silverline but I also restrict my self to a budget. So I am looking for people who might say, Yea, I know quite a few people who have had that problem or this with that and they changed to ?
My sources are the Silverline S-500 CD and a Project Perspective with a Blue Point Special. Dale

I already own the Pro Silways ( balanced from pre to amp and single-ended from CD to pre ) and the Pro-11 and I am very happy with them. But if there is more to be had by a simple cable change then I am willing. I am surprised that you didn't find any increase in detail and delicacy with the Magic. The system that I listened to at a local audio hut displayed a significant difference in the two cables. But I guess that just goes to prove that it is all about synergy. Dale

Mg123, I do not think that your statement about the NAD Silverline preamp not being in the same level as the Krell, Pass, or Dynaudio is in fact. The S-500 is a different animal than the regular NAD equipment. The Silverline is NAD's bid at the highend. I chose it over the Krell KAV-250p and others. It had a much more balanced sound and it's build qulaity was a notch better. It's Danish heritage was very evident. I don't know why the Silverline suffers from PR problems but it could have something to do with NAD not giving free samples to the American audio media. They make them buy the samples. Go figure. But after going through a few preamps to buy the NAD was the winner in overall sound quality so I was not focusing on it. Dale

Danielk141 You are starting to get into realms that I don't deal with but here but here is the statement for the S-100 manual.
From input to output, the S100's circuits are engineered for very-low-distortion Class-A operation, with a vanishingly low output impedance (long an NAD hallmark) that reduces the sonic impact of cable impedance to near insignificance. And it provides a choice of primary outputs: conventional, unbalanced RCA jacks, and fully balanced XLR jacks. Unlike those in many consumer products, the latter are true "pro-audio" outputs capable of delivering up to 20 volts to 600-ohm loads while significantly reducing susceptibility to external hum and noise.
Maybe you can interpret that. I listened extensively to the Adcom GTP-750 since I owned Adcom equipment before this system. I felt that the NAD was just much more smooth and balanced to my ear. I also discovered during testing different gear that I like the balanced connections between the preamp and amplifier but the single ended connectors between the CD player and the preamp just sounded better.
So what I am getting from most is that there may be a difference in amplifiers but the real difference is in the preamp in my system. I have been listening to a Sim Audio Moon P-5 and was thinking about taking it home soon but I have not heard that much from it that would make me think that I am lacking at home.
GregM, when I am speaking of sterile due to a lack of tonal balalnce, I am repeating what I am hearing from some. I am not stating that I hear that. But I am wondering if I am missing something since I don't know any better. You don't know what you are missing until hear it in something or some where else. I tend to like my listening a but more analytical (favor SS ) than smoothed out (tubular) so I will favor towards something that seems to sound more accurate than something that may sound more musical but lacking detail. So I have to like the sound. My mileage does vary obviously. Dale

Thanks Sqjudge, I am getting some great lessons in balanced circuitry. I just knew how good this preamp was at sonic reproduction so I had to inquire. I did not understand the explanation Of Danelk141 so I had to start investigating. You hit it right on the head of the information that I was reading. The deal of adding four more gangs to the volume control was the reason that NAD stated for not adding balanced inputs to this preamp. Only outputs. Still, I guess that specs don't mean anything unless you can interpret them and understand their value. This thread has been very educational for me. But I am afraid that I have asked an impossible question that can only be answered by experience in listening with the desired upgrade in my own set up. Dale