After 25 posts, no-one has pointed out that there is no 'ground' connection in a balanced analog interconnect system.
The first paper by Neil Muncy
"Pin 1 Revisited"
Neil Muncy called our attention to the Pin 1 problem (the improper termination of the shield of audio wiring to the circuit board rather than to the shielding enclosure) in his classic 1994 paper, reprinted in the June 1995 Journal of the AES. When he wrote his paper, most commercially available audio gear had pin 1 problems. It was, indeed, difficult to find equipment without it -- even the most prestigeous consoles had serious pin 1 problems! Over the next decade, the better manufacturers redesigned their products to correct their mistake, but sadly, many have not done so. This is the first installment of a two-part article published in the SynAudCon Newsletter.
http://www.audiosystemsgroup.com/Pin_1_Revisited.pdf"Pin 1 Revisited -- Part 2"
This is the second installment of a two-part article
http://www.audiosystemsgroup.com/Pin_1_Revisited_Part_2.pdfLater it became Audio Engineering Standard 48
AES standard on interconnections
-Grounding and EMC practices-
Shields of connectors in audio equipment containing active circuitry