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

When I was comparing many RCA digital cables years ago the High Fidelity Cables were substantially better than anything else. I would get one of their RCA models and put BNC adapters on them.

Also, I am not talking about the new HFC 'Reveal' cheapo line, which does not even compete with the original CT-1. Try to get a CT-1 Ultimate or above. I use a CT-1 Ultimate Reference.

Interesting that there are digital cables that can add a "1" here and a "0" there to give warmer sound and higher resolution. Need to invest.

Not just adding a "1" here and a "0" there, adding them exactly where they are needed.

Myself I use Kimber Cable D60 Data cable with BNC connectors to RCAs on the D60.
BNC adapters can be purchased on Amazon or Audio Advisor online.

Anyone who thinks a digital cable sends ones and zeros down a wire has no idea how digital audio works.  A digital cable carries an analog wave which is an imperfect representation of a digital square wave, and carries a bunch of noise. 

I suggest watching the excellent video which explains all this.
https://www.youtube.com/watch?v=grzoqEb2KMk