Thank you all for these responses. For those who are curious, you can view pics and a description by clicking on my username. My room is small for my speakers, but I have done numerous room treatments. My amp is at least 200W into 8 ohms, and 400 into 4, so there is no power problem. I have Vandersteen 2CE signatures, which are good-quality speakers.
I guess a more focused question is, have digitally oriented choral music fans noticed a difference in moving to a DAC in a better price/ quality range? Do tube preamps make a difference in softening or further resolving choral vocals?
It sounds like, for some of you, that these changes make a difference.
Schubert, thank you for the music link. I grew up in Manitoba, and sang in choirs full of Mennonites, so I know what those Germanic and Scandinavian prairie communities can do for a choral music scene!
Enjoy the music,
Paul