Wynnytsky
500+ Head-Fier
I recall the OS jumpers being more of a complement for the smooth FW than for the accurate. On accurate I'm doing NOS0+PLL, but doing 4x OS in JRiver using experimental SoX kicks it up nicely. I also disable JRiver's default filter, which I think is dither.I still use the setting 4x os with dithering
(an observation I've neglected to mention...)
When comparing other DACs to the R2R7 I often look for the part of the track that's at peek volume -- a crescendo of instruments and/or vocals that is closest to clipping. For some reason the R2R7 maintains composure through these passages while a Sabre DAC may at best survive those same notes. Tube DACs and vinyl also do well in this regard.