It is a good article, linked in post #5. https://www.audiosciencereview.com/...t-to-amp-module-connections.15547/post-495454Great article by Bruno Putzeys here. Even has some audio humour thrown in.
https://www.edn.com/the-g-word-how-to-get-your-audio-off-the-ground/
When you get to section 4 there is a preamp to build which costs peanuts. Clever engineering by Bruno allows the use of a £6 car stereo potentiometer to produce results you would pay £ 00000 for.
As I see it the shield of the balanced cable is connected to metal shield around your audio components but not to the ground of the PCB where your delicate audio signals are.
However,
page 9
"At some point the problem became so prevalent that the AES had to enshrine the obvious into a standard. Called AES48, it patiently explains that the shield should be connected to the chassis via the shortest possible route and that connections between the PCB ground and the chassis should be made elsewhere. "
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