Why am I getting an intermittent buzz with preamp and studio monitors?

I've just gotten rid of my desktop computer speakers which plug into the mini-headphone audio out on my Macbook Pro (i7, 2.66, mid 2010). Instead, I've connected via firewire 800 to an older 8 ch Presonus Firestudio Project preamp, and have connected a new pair Fostex powered studio monitors to that for my audio (and scratch recording). When I first start playing music in iTunes it all sounds great. But after a while, I'l start to get these periodic loud electronic buzzes. It's not just in the background, it actually will cut off the song to make the loud sound for a brief second. Over time it will become more frequent, and at one point it got to the point that it was just a constant buzz, no audio at all. Unplugging firewire stops it. Since there are a number of components, I'm not sure what is causing the problem. Can anyone help?

The update didn't apply correctly, which will be typically due to an interuption within your setup. You will have to connect to iTunes via micro usb to restore.
http://support.apple.com/kb/HT4367?viewlocale=en_US&locale=en_US

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Why am I getting an intermittent buzz with preamp and studio monitors?

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