Originally Posted by JimN
So, you want him to make the shield useless by inserting an isolation transformer in-line?
Can't answer a poorly constructed question.
But use the transformer? Absolutely, as a test at minimum.
The shielding function will still be intact just as it is with a standard RCA ground loop isolator. It simply keeps DC (that may be modulated, ie; noise) from passing down the shield from one device to another.