Mel: Thanks for the feedback; I've heard the CAP-2100 and am sure you would be blown away by the differences sight unseen as that piece does not have a great pre-amp section; it always struck me as a bit flat up top, unrevealing in the mids and not enough depth and impact in the bass. By comparison, the Classe CP-700 I've had for several years is a whole other story and gives everything I was and still am looking for so it would be a great showdown. I'm also considering the Esoteric C-03 pre-amp. I've read that thread you are talking about on comparing the Esoteric and Ayon pieces. In this day and age there are many, great contenders for state of the art and yet musical playback and pre-amplification. Ah,...the pursuit/obsession never ends! I am keen to hear your feedback after the Isotek CD has run its course. I've found that CD to be a great resource...