The tolerance in DAC differences are of about 0.5db from consumer to professional devices. So to answer your question plainly, no. I also don’t use tube in my signal path as it would go against the fact that I’m reaching out for transparent devices and try to avoid as best as I possibly can any devices that introduce distortion (ie tubes). We often go about how flat a set of cans are but we often forget the amount of distortion underlining their transducers at specific frequencies. Usually very upfront in the low end for dynamic drivers compared to planars.I have a basic question about all this work after getting your parameters right on the nano, what happens if you go out & buy a new dac/amp or go from solid state to tube amp or even your mobile dac/amp will you have to re-do or adjust anything to suit your constant changing source ?
Hope that help.