Thanks for posting that- this following quote from Steve on that thread leads me to believe that there is something to knocking the Taboo volume down a bit, and raising the CSP master a bit. I have been trying this a bit as I described a few posts back, and liking the sound, it's good to know that it's not entirely "incorrect".
"If the amp you are using has a gain control we assume it's all the way up. That said, if you want a particular recording to have more punch, less thinness, you can simply turn the gain on the amp down a couple notches and run the preamp master volume a bit higher"
I also have a low gain (1.25v) and high gain (2.5v) output on my DAC so there is that in play as well. I tend to get slightly different signatures from the two gain settings, I wonder which is more "direct" or "pure"...ie less circuit in the path?
Do you think it will depend on your dac's power supply? I know alot of power supplies are overbuilt, like the Taboo, so they are never really stressed which keeps good sound quality.
If your dac's psu struggles more to output the 2.5v maybe 1.25v will sound better?
This is all guess work on my part of course. If you are using Audio-gd as your source it's probably fine. Those things are built like tanks and have great psu's.
I love my NFB-7.1 even if it is the size of a kitchen table