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static noise on output with multiple Pis

I'm trying to power multiple RaspPis and DAC+. If I power them all from independent usb power sources everything works great and no static. When I try to use an Anker PowerPort or a switching power supply to power more than one Pi I get static on the output.It sounds like a grounding issue but I can't figure why it works with a single Pi but not multiples.

Thanks.

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