XLR or single ended cables and why?


Few audio equipments reviewers swear by their reputation if there is any that XLR connections improve quality of the sound sonically. Some stated there is none. Can someone scientifically help me to make a wise decision to choose between XLR and singled-ended cables?
andrewdoan
Tvad:
my statement was copied directly from the Cobalt Cable website. Any errors are due to the info published by Blue Jeans Cable...
It's sad that it was written in the first place and even more so that it makes the average person believe such nonsense - and quote it!
Not your fault, but it's not a good thing...
Post removed 
Tvad, I talked to one of the cable tech.rep last week and you were right on the fact that they did not know for sure what the heck they are talking abt. As a consumer, the " I think..." does not not worth a "shot" to me. They dance around the issues as good as their sales rep.
Post removed 
It is a different situation if the grounds are electrically seperated. Such is the case with a true dual-mono implementations or monoblock amplifiers, if they don't share grounds with an external ground wire or through the AC ground

In the case of mono amps with single ended inputs they will share the same circuit ground, they are connected together at the single ended source, ie. pre-amp.

steve