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Hissing speakers when something plugged into FireWire ports

I have a pair of Event TR-8s that are connected to my Powerbook G4 and they emit a very audible hiss (like exagerated tape hiss) when I have something connected to my Powerbook's FireWire ports. As soon as I disconnect the FireWire cable it goes away.

I have an external FireWire HD that hosts some of my sample and audio libraries and need to have connected while I work.