Blue Jeans Cable Sound Good???

screen is referring to the ground and noise shield.... in this case, built like a cross hatched screen.

https://en.wikipedia.org/wiki/Coaxial_cable
The image the link, it is the ’B’ item that is the ’shield’ or ’ground’.

Both ground AND shield, in this case of a coaxial transmission line design. To reject RF and noise injection into the center conductor, which is the one carrying the intelligence or signal.

That ’signal’ is referenced to the ground/shield, likened to your riding a bike and the bike is referenced to the ground you ride on. (Bike no workee with no ground to ride on)

Something in the given case has to refer to a standard set point, and in this case it is carried by the ground, and acts doubly as a rejection of noise and interference.

Thus the ground can be referred to as a ’shield’, as well.

It, in conjunction with impedance functions..that..is about all we really need to know when applying to RF signals...grab the engineering bibles and apply, all will be fine.

But it is unbelievably inadequate when it comes to dealing with audio signals, which have the widest bandwidth and go from DC to extremely high (low RF) frequencies.

Audio...which is unique and is the probably the most complex of all in the domain of electrical AC signals and propagation. Impedance applies to audio cables about as much as the given relative speed of the moment..of a car  --applies to the design of the entire car. It's applicable, minimally, yes... but relative to the whole package? No.

I’ve never heard and extended ground or shield, as in unconnected at the destination end...I’ve never heard one sound good.

To get to a good sound quality, the ground loop has to be corrected at the equipment level, not the cable level.

As for shield and ground being different, yes. but for simplicity’s sake, I stated it the way I did.

Never heard a single shielded cable sound any good, in the realm of unbalanced, or single ended.

Fix the system as it can’t be properly addressed at the cable level. If one tries to fix it with the cable connectivity end of the deal, one is asking too much and doing it in the wrong ways.

Just my experience.....
I cam see the sense of it with MM/MC signals and microphone level signals, but one has to be careful with the mechanical of the cable design.

With line level field bloom and intensities, we get to a point of interference/interaction with signal by the ground/shield. This makes the cables sound plain bad. In such a case, fix the room, fix the interference, fix the design flaws....and go with unshielded cables.
All Teo audio cables are unshielded and unscreened.

I took a 8M balanced liquid metal cable(GC balanced), totally unshielded.... and placed it mixed in with 6-7 different active AC power cords, into a high gain integrated, and high sensitivity speakers.. Volume potntiometer wrapped right around..wide open...and..not one single bit of detectable hum or noise, or interference of any kind. Just..transistor noise.