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.
Amazon.com: SMSL DO100 USB DAC ES9038Q2Mx2 OPA1612x4 Bluetooth5.1 DSD512 32bit/768kHz USB/BT/Opt/Coax Input RCA/XLR Output High Resolution Balanced Audio Decoder with Remote Control : Electronics
SMSL DO100 DAC 2x ES9038Q2M XMOS Bluetooth 5.0 aptX HD LDAC 32bit 768kHz DSD512 - Audiophonics
SMSL DO100 ES9038Q2M XMOS Bluetooth 5.0 DAC
SMSL DO100 DAC Review — Headfonics
SMSL DO100 DAC 2x ES9038Q2M XMOS Bluetooth 5.0 aptX HD LDAC 32bit 768kHz DSD512 - Audiophonics
SMSL DO100/HO100 Review: This Affordable DAC/Amp Combo Is A Budget Audiophile Dream! - HIFI Trends