Thanks khrys,
Heresy indeed! Another vote against the preamp. I will have to revisit this. I just ordered two pairs of Transparent Audio Ref. interconnects and a pair of Ref. speaker cables, which arrive tomorrow. I will break them in and listen both ways.
Perhaps I will speak with Maier- thanks for the reference. The Vivaldi is a transcendent piece! Just to refocus, I visited Music Lovers in San Francisco, which also sells both Berkeley and dCS, where I heard a well controlled comparison of three dacs- Berkeley Ref 1, Rossini and Vivaldi, no upsampler or clock with the dCS units. All were fabulous, but to my ear, the Rossini bettered the Berk. by enough to justify the price gap; the Rossini took it several flights up, and I gather the other "stack" accessories just keep sweetening it up. I was leaning toward letting the Berk go for Rossini when I learned of the upgrade option from Berk 1 to Berk 2, at a nominal cost. So it seems I owe to myself to learn whether Berk has narrowed the gap on Rossini before spilling more money on this obsessive hobby.
Again, thanks for your interesting post. Music Lovers is now breaking in their Berk Ref 2, so perhaps I will be able to answer my own question in a few weeks?
Best to all, D