Connecting my MacBook Pro to my DVD Surround Sound Speakers?

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I'm a student filmmaker in the UK and pretty much do all my video editing from my bedroom using Final Cut Studio. I am using a MacBook Pro3,1 (bought in 2007) and have recently decided that I want to start working in 5.1 surround sound.
As I have no surround sound speakers with my MacBook Pro, I was wondering if it would be possible to connect it up to my DVD surround sound system? This would ultimately save me having to buy a compatible set and having two lots of surround sound speakers around my room...
My DVD player is a Panasonic SC-PT150. The 6 surround sound speakers each connect to it through the standard +/- "clip-in" wire set up (which, obviously isn't compatible with my MacBook Pro). There are also two AUX sockets (one for Left and one for Right) on the back of the DVD player. So far, I have tried connecting my MacBook Pro to these sockets using a Mini plug to RCA cable, however, all I get is an incredibly loud humming noise.
Does anyone have any suggestions as to how I might, either overcome this problem or, get the setup to work another way? Thanks in advance for your help.
Thanks both of you for your help.
It doesn't mention either of those connections in the manual, however, yes you are right, it takes digital input. I'll have to call and check if the toslink cable is compatible.
I tried connecting the mini-stereo-to-RCA cable to my Nokia phone (which is actually where the cable came from) and that plays through the DVD speakers just fine, when i select AUX mode. Although, as you said, it only plays stereo.
Say the mini-toslink cable is compatible, would I need to get a 5.1 surround sound card for my MBP?
Thanks again.
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