Can't get rid of noise in external Roland speakers

I have some Roland MA-8 micro-monitor speakers that i realllly like, but i haven't been able to use them with my iMac G5. As soon as they are connected and turned on, they have an annoying hiss/hum, and when i launch Garage Band, there's an additional continuous electronic clicking/popping noise (in batches of three clicks) and static. The same speakers work fine, with just a very slight background hiss, on my iBook. But i want to use them on the iMac, of course.
have tried switching audio cables for others, no difference.
On the iMac, setup is a mini cable from the headphone output to the speakers, and they're plugged into a power strip that is plugged in to the same surge protector that the iMac is plugged into. i also have a PreMobile USB audio recording interface hooked up to the iMac.
I may later post this in iMac G5 topic since it seems to be specific to this G5 (i used them on a prior iMac fine). But i know there can be many audio issues that could be contributing, and it's worst when Garage Band is open.
Suggestions?

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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Can't get rid of noise in external Roland speakers

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