audio reseach ref 3 or krell KTC...?

Additionally, I believe (though I am not 100% sure) that the ARC is a full tubed preamp and does not have coupling capacitors in use for its output. Krell does recommend that if you use a full tubed preamp that you activate the coupling capacitors in your Krell amp for protection for DC signals. Of course, you are now adding these caps into the signal (the only caps in the Krell signal) so this may impact the sound as well of the amplifier.

Just out of curiosity, any krell amp owners running all tubed pre-amps (without coupling capacitors to prevent the passing of possible DC - ie. from the tubes) into their Krell amps? Have you activated the coupling capacitors in your krell amps? If not, any problems? What preamps are you running?

Dave,

Have you ever had a problem? I just read an ad recently where somebody sent their FPB in for servicing resulting from damage from a tubed preamp leaking DC.

Since I have not yet converted my Krell to include the caps active, can you give me any indication of the sonic impact?

Dave b, thanks. I checked with Aesthetix and they have reported that they do use coupling capacitors at the output for this form of protection against dc leakage. So, fortunately, no worries.

On another note, if one buys a FBP C vs. a non C version, is there any improvement if one is not using the Cast cables? Aren't there cast speaker cables? Do these just work with Krell speakers?

There is a 300C for sale that I am considering and only want to buy it if it is a step up (preferably sizeable) from my FPB 200?

Dave b, it is a 300 C not the CX. I can get it upgrade to a 400 CX for $2,500 from Krell. Regardless, I bought it and am picking it up tomorrow. Hopefully it will be better than the fpb 200, which I already love.

I think it would generally make more sense to just buy a 400 CX versus having the upgrade done. I think from a cost to resale relationship this would be better economically. I'll listen to the 300 C before making any decision. I certainly don't need the additional power, but am always interested in anything that will improve performance.