Summing Mixer Amp - Balanced or Unbalanced?

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abbey road d enfer

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This looks like a potential giant ground loop to me. I would use shielded 2-conductor cable off of each jack, then tie all grounds "starred" at one point.
Nonsense. With balanced connections, the shield carries no signal. They all come from a single point, the converter. Connecting them to a star point or bussing them makes no difference.
Actually, they may well be left floating on one side.
 

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