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If you have a USB battery pack then that's a good way to test it with some "clean" power.
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assumed ground loop
Is anything actually grounded? With most PSUs being isolated, you may not have a true ground at all. That would be a good starting point, as it allows you to pick one place to ground and star-wire all the other components to that.
aggi
gbj_tester
@Currid
Anyone know much about powering a minidsp 2x4?
I'm using one as a crossover in 2.1 set-up. When the 2x4 is powered via usb from the computer its fine with no noise. However, try and power it with a suitable (correct spec) wall wart or via a usb charger plug then I get a hum (assumed ground loop). My laptop is plugged into the same outlet so have no idea why it's silent through that? Please help!