Hi Al,
Disregard my last post.
https://www.dropbox.com/sh/1rdxqg82pw3ecq9/AAATCANt3v5Vc3kMZ0taSa1na?dl=0
Look at picture #3 of the OP’s Link of the XLR connector. Notice that jumper wire from pin 1 to pin 3? Could that be the problem?
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Found this doing a search for the wiring of an XLR connector.
http://www.scotaudio.com/wiring.htm
Quote from Link:
"How to wire an XLR connector (unbalanced)
The unbalanced system is used for high impedance microphones over short distances, and is not recommended for professional use due to susceptability to any RF noise - such as lighting sources, taxi radios etc.
Pin 1 is shorted to pin 3, at either end of the cable"
End of Quote.
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Here is another Link.
http://www.rane.com/note110.html
Al,
Me thinks this could be jo3533 noise problem. What say you?
All he would need to do is clip the jumper wire that is connected from pin1 to pin 3.
He would need to check the connectors at both ends of the cable for the jumper.
He could start with just one cable and clip the jumpers and then try the cable in his system and check for the hum/buzz.
Jim