But did you drive only the Shiit DAC from 2 different S/PDIF sources or use 2 different S/PDIF cables?
This will tell you whether it is jitter immune or not.
Hi Steve. More than two sources actually, however, I get what your saying (and have no disagreement) about using the same source with different S/PDIF cables. So no, I did not use a different S/PDIF cable with the same source. My gear and connectivity of same is as follows.
Musical Fidelity M6si > Belden 5T00UP speaker wire > Golden Ear Triton Reference (pair)
Schiit Yggdrasil > Canare L-4E6S XLR > Musical Fidelity M6si
Oppo UDP-205 > Belden 1694A (Canare RCAPs) coax > Schiit Yggdrasil
Emotiva ERC-3 > Belden 1800F AES/EBU > Schiit Yggdrasil
Samsung SMT-C5320 > Optical Mitsubishi Eska POF > Schiit Yggdrasil
Gateway NV79 > Belkin e129760-c usb > Schiit Yggdrasil

