I'm not familiar with the Krell amp, but I own a Proceed Pre. There's not much posted about this preamp, and what there is (that I've found), isn't highly complementary. I bought mine as a package with a Proceed Amp2 off ebay. When I first played them I was underwhelmed, and began to understand the postings. Imaging was weak and it sounded kind of harsh. I split them up and tried them with other components, and found that the Pre when combined with other amps was much better, and with Tube amps it's fantastic - especially for the $ I paid. I don't comprehend why doesn't sound better with its sister power amp. It doesn't sound bad, but I expected much more given the original list prices these sold for. BTW, the amp 2 was also better driven by another preamp.
The pre is built very well, and is feature rich. I like most things about it, but I think the message is be carful what you pair it with. It's wonderful with Tube amps (I've tried several), and it worked great with my B&K M200 mono blocks, but not as nice as my Musical Fidelity NuVista preamp. I'm not familiar with the McCormack
I once owned the Classe CP35, I would probably take the Pre over the CP35 if the price is the same, or maybe pay a little more because of the features.
The pre is built very well, and is feature rich. I like most things about it, but I think the message is be carful what you pair it with. It's wonderful with Tube amps (I've tried several), and it worked great with my B&K M200 mono blocks, but not as nice as my Musical Fidelity NuVista preamp. I'm not familiar with the McCormack
I once owned the Classe CP35, I would probably take the Pre over the CP35 if the price is the same, or maybe pay a little more because of the features.