Archimago's Musings: REVIEW: S.M.S.L. DO100 DAC [Part III - DSD, Subjective, AMPT Recording, and Conclusions]. And a very close look at the Topping D10 Balanced THD(+N) vs. Level graph.
DO100
SMSL DO100 And SMSL HO100 DAC/Headphone Amp Review - Dynamic Duo • Audioreviews.org