IMac to TV plus Digital Audio

Hi,
I have recently upgraded my Home Theater system, and decided to hookup my iMac intel Core Duo 20" up to it. My reciever is the Onkyo TS-SR804, and i'm running the video as such, mini-DVI to DVI then to HDMI, the video works great, it's the audio I'm having problems with. I wanted to use Coaxial Audio, because it was cheaper than Optical and still gives a digital signal, I bought a cable with a 3.5mm jack on one end, and a coax jack on the other, when I plug it in, i get a very low quality sound, and can barely hear the audio. I turn the reciever all the way up, and I get a very fuzzy, very bad, unclear audio signal. I was wondering if there was any way to fix this. Any help would be appreciated.
Thanks,
Stuart

I'm just using these as examples, if the one you have is like this (below), it's oniy mono, and the head phone jack from the iMac is stereo. Look at the 3.5mm end, it needs to be segmented into three parts for stereo, this one below is only segmented into two parts mono.
http://www.maplin.co.uk/Module.aspx?ModuleNo=34197&criteria=3.5mm%20to%20coaxial &doy=22m2
17" iMac Intel Core Duo 1.5GB Ram   Mac OS X (10.4.8)   Maxtor 300GB FireWire 2G Nano

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    Message was edited by: algor_langeaux

    algor_langeaux wrote:
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