Crackling and pulsating noise in external USB speakers

How to eliminate crackling and pulsating noise in external USB speakers?

i need to access the Roland's knobs while sitting at the Mac (am using them as monitors in recording etc), so there really isn't a good place to get them further away. By interface, do you mean the PreMobile? that's an interesting idea. I've now tried that (via the line out, the rolands have a single 3.5mm cable, no RCAs); it got rid of the static noise, but the still a loud hum, and the PreMobile apparently doesn't monitor ordinary system sound output (like iTunes). But this experiment does point to the iMac itself being the source of the static noise.
The only AC-powered periphs in the loop are a couple hard drives and a printer (and a USB-powered Wacom tablet; the PreMobile is USB-powered as well).
I've got the speakers plugged into same grounded strip as the mac and the peripherals, trying to minimize ground loop, but it doesn't help.
Someone suggested a ground loop isolator gadget... anyone had success with those?

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