IMac wakes from sleep odd

I have an iMac G5 iSight, and for some reason it seems to be waking from sleep when I turn on my powered speekers connected to a different computer, or if I plug in something to the wall outlet, any idea why this is?

It is checked to wake for ethernet network admin access, but that is it. The iMac Is plugged into a wall outlet, and I have a Power Mac G5 plugged into a power strip that is plugged into the same wall outlet. I Have also noticed that if I am walking on my carpet and I touch the Power Mac, the iMac Will turn on.

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