What is the best BNC Digital Cable under $4,000?

There is no proof of anything in audio. There is evidence, though. Empirical evidence such as listening tests appear to support the proposition that there are differences between all types of cables. Speaker cables, interconnects, digital cables, power cords, Ethernet cables, HDMI cables. And there are audible difference in plain old wires, too. If someone can’t hear differences in any of those things he’s in the very small minority and is therefore an outlier. And thus can be thrown out. We’re all quite familiar with the Juror no. 3 from 12 Angry Men, “You can’t prove it!”

So far "pro-audio", "confirmation bias" and the Mona Lisa have been mentioned in this thread. I ask you fellow ’goners, has "expectation bias" slipped through the cracks? Someone needs to cite "expectation bias" soon or it will feel left out.

@mzkmxcv - please stop with the "that's not proof though". The only proof needed is for you to hear a difference that is worth paying for. See @geoffkait comment above.

Agreed, please, please stop with all this off-track discussion and get back to the OPs question. I did address this with my last post and hope it was in some way helpful to the OP. Let's be helpful to the OP, not hi-jack therir 

Arggh. Hate when that happens. Meant to say "Let's be helpful to the OP, not hi-jack their thread."

@geoffkait

Sighted listening tests are useless data unless combined with double-blind, quick-switching, and level-matched, as a way to demonstrate bias.

@pokey77

An answer to OP was pretty much given by others (who believe in differences), in that it is so heavily a system/personal dependent, that one cannot say which is best, only giving their testimonials on what they have heard, or simply listing everything that is available and telling OP to audition.

There is no actual answer to which digital BNC cable is the “best” for <$4000. 
 
My recommendation would be the BJC Belden 1694A BNC cables.