@soix, @audphile1, and @glennewdick , I think the DA1 vs DA2 module issue is moot for me. I have the C-47, in which the digital board is not upgradeable, as it is in the C-49 and C-55. That’s ok for me. I think that lack of upgradeability accounted for the deal I got. I assumed DAC improvements would need to come "outboard" of my preamp. You guys now have me focused on a dedicated higher-end DAC as a near term upgrade to my system.
@russ69 no offense taken regarding the Heresys. I got them originally to go with a vintage setup - includes a Marantz Model 19 (which I LOVE) and a Denon DR-M30HX cassette deck. I also have pairs of B&W602 and Elac Debut 6.2 B, which I can try out as well.