"FWIW, I use an Oknyo DX-C390 CD changer as a transp. (certainly nothing special there), out via a Mapleshade Double Helix, digital RCA to a Monarchy DIP Combo, out via another Helix, to a Ric-Schultz-modified, diffrentially balanced Begringer DEQ2496."
You are evidently trying to address jitter, but believe me, you are not even remotely close to getting there. The digital source is THE MOST IMPORTANT thing in the system, next to the speakers and amps. Even more important than a modded DAC. I used to mod the DIP for customers, but I dont mod anymore. There are much better ways than this to reduce jitter in CD players. However you must either replace your transport with a megabuck transport and then re-write your CDs to reduce pit jitter, or add a better reclocker to your existing transport that totally blocks its jitter.
Even if you do either of these, it will still not approach the jitter levels now possible with USB interfaces, at least some of them. For the same money, you are better off to buy a 2009 Mac Mini and a USB converter than an expensive CD transport. I have had many CD transports from customer in my system over the years, which I used to mod for them. None of thse hold a candle to a good USB interface.
Steve N.
Empirical Audio