Anyway, what is your opinion of using USB in the following configuration:
Gateway NV79 > Belkin e129760-c usb > Yggdrasil
A better USB cable would improve things. The problem is that most USB interfaces built into DACs are not that great. There are a couple of decent ones.
Should USB produce better results than the Belden 1694A coax?
Depends on the USB interface and the S/PDIF interface and associated clocks. There are a lot of variables. I would think that a low jitter source using a good S/PDIF cable to the Yggy would outperform the USB input. My BNC cable has RCA adapters with it, so you can do any combo.
Should there be improvement if I were to switch the optical from my cable box to the Oppo? (note that according to Schiit, AES/EBU is best to the Yggy, followed by coax)
If you use this for TV, movies on Netflix and 2-channel audio, then I would recommend using the IFI S/PDIF iPurifier for $149. You can go optical in and coax out using my Standard BNC cable. This is what I do with my OPPO and my Smart TV to reduce jitter. It supports all formats, including Dolby Digital and DTS. Big difference with TV and movies.
I only have AES/EBU out from my Emotiva. I also recall reading from Georgehifi that some type of glass optical is best, which I’m also not using.
I thought the Emotiva was a DAC. If so, then the AES/EBU is an input, not an output.
I'm getting confused as to what is driving and what is receiving here....
Glass cables can be very good compared to cheap plastic, but the plastic I use from my Smart TV is even better than glass. From btpa.com:
https://btpa.com/?target=search&mode=search&substring=toslink&including=all&brandId=0
Steve N.
Empirical Audio