Why is audio output so static-y when used with dvi/svideo?

Hi,
I like to connect my MBP to my TV to watch shows and movies. I connect the video to the TV with an S-video cord, which is connected to my laptop via an DVI-to-SVideo adapter I bought from the apple store. I connect the audio to the TV with a mini-to-RCA cable.
The problem is that when both the video and audio cables are connected to my laptop, the audio coming from my laptop and out of the TV sounds really bad and static-y. If I unplug the DVI adapter (and lose the video connection), the audio sounds perfect. So this suggests to me that the DVI adapter/S-video connection is somehow interfering with the audio.
Has anyone else had this problem? Any suggestions about ways to fix it or possible workarounds? Perhaps another way to connect to my TV that I haven't thought of? (My TV only has Svideo and RCA inputs).
Thanks so much in advance for any advice or suggestions!
Jamie

No pat answer, and I don't setup like that, but some questions:
-Do you mean that the sound is bad when the S-Video is connected and 1) the sound cable is connected to the TV and 2) also sound is bad just through the MBP speakers (sound cable not connected to TV)?
-Not sure what "really bad and static-y" really means - is there loud hum?
-Have you tried reducing the MBP playback level and increasing the TV volume level?
-Have you tried running the MBP on battery power?

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