Serious audio static when using display or FireWire

I've got a strange issue with my Core Duo Mini (1.66GHz). When plugged in to my stereo using an RCA Y-splitter from RadioShack, there is static bad enough to drown out all the audio. This happens with any combination of audio cables I use, but does not happen with other computers plugged into the same outlets, or with headphones or portable, self-powered speakers.
So far I've survived using an AirPort Express, but decided that I've had enough of fiddling with audio delays in VLC when watching DVDs and tonight rewired everything. The buzz is still there.
What I inadvertently discovered is that if I leave my display (Apple 21" Studio CRT) and two FireWire hard drives unplugged, the static disappears.
I'm considering the purchase of a USB audio out device (such as the iMic), but would rather not spend more money on this.
Thanks for any insights!
Mac Mini Core Duo 1.66GHz   Mac OS X (10.4.7)   1GB RAM, 80GB internal HD, 160GB FireWire HD, 600GB FireWire HD, Alesis IO|2, Apple Studio 21" CRT,

I've been having a similar problem where I'd get a low buzzing sound going to my self-powered speakers. After doing some research, I found that I'm just getting electrical interference from one of the devices in the chain. So the only solution for me was to get a Ground Loop Isolator which basically grounds the electrical interference in the wires before going to your stereo.
http://www.xitel.com/product_gli.htm
There are much cheaper versions at radioshack.com as well.
I hope that helps.

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