• 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!

  • 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.

  • Turntables are grounded to the mixer. Pre and power amp and powered sub I have no idea about (no grounding cables). I did wonder about grounding the 2x4 chassis?

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