Speaker buzz/hum with two Macs

I have recently purchased a Mac Pro Dual 2.8 Quad Core Xeon to go with my crusty MBP 2.16. I am using a Yamaha speaker system (2 desktop satellites and a sub). The Yamaha has two 1/8" inputs on the back of the subwoofer. When I plug the two computers in, one input each, the Yamaha system emits a prominent buzzing/bassy hum. This doesn't occur with either computer plugged in alone, only when both are plugged in. I tried using a Y cord so that both would go into one input, and it still buzzed/hummed. I seem to recall this same thing happening years ago with a different brand of speaker system. Is there a way to hook the two Macs up without the humming?? Any help appreciated. Thanks!

Hello pingvuiini,
It almost sounds like you have a ground loop happening.
http://en.wikipedia.org/wiki/Groundloop%28electricity%29
Are both comps plugged into the same power?
Have you switched the 1/8" cables around to see if one is bad?
Does it buzz if you unplug the MBP from power and run from the battery?
Do you have any audio cables laying on top of the computer power supplies?
Sorry to hit you with so many questions so quickly.
I have a very similar set up:
Yamaha speakers w/sub
(2) 1/8" inputs
MacPro 2.8 quad and a powerbook conected, no buzz.
I would check these things first.
Good luck!
-delton

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