If the outer shield is only terminated at one end, it does not carry signal current and therefore the internal wire that is used as the "signal ground" does get protected from outside interference to a significant degree.
This can certainly be an advantage IF there is any significant source of interference in the first place. With some equipment, in some locations, it can offer an audible benefit in my experience compared to a simple coaxial cable.
With other equipment, in other locations, it seems not do so. There are an infinite number of variables, so the possibility of a difference is unpredictable. One factor that may be involved is exactly how the signal "ground" is floated within the equipment circuitry at either end.
One thing I am fairly certain of: anyone that says "cable A is better than cable B" without any qualifications is wrong. Cable A MIGHT perform better in a certain situation, and NOT in another location with different equipment. That has been my experience, anyway.
In any case, arrows on the outside may not mean there is a "floated shield". It may just mean they put them there.
P.S.- The Audioquest Evergreen definitely DOES NOT have 3 wires or a floated shield; it is a simple coaxial design, so arrows are meaningless if it has them.
The Audioquest Diamondback and King Cobra are the ones that I know have a floated shield and 3 conductors.
Originally Posted by whoaru99
That's most often what the arrow indicates...shield floating at one end. On some the arrow points to the floating end, on some the arrow points away from the floating end.
Whether or not this connection method has any merit is a separate issue.