QUOTE(autoxerFSP21 @ Apr 28 2006, 03:38 PM)
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I've always heard it was a bad idea to use those cables. Supposedly, they don't support the bandwith required by digital audio. I've never tried it, so I can't really say.
Then what's the point of posting speculations?
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I have both an Xbox and a PC with a nForce2 chipset with Soundstorm. The Xbox uses optical, the PC coax. My receiver supports both and tells me the AC3 signal is the same.
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Yes, optical supports more bandwidth compared to coaxial and is immune to electrical interference, but it is not needed for digital audio. S/PDIF, AC3 and DTS all use relative low bandwidth which can easily be transported over coaxial.
In my opinion, the only real reason for using optical instead of coaxial would be if there was support for 6 uncompressed/lossless audio channels. However, I think that with a bit of effort (and lossless compression), even those 6 channels can be send over coax.
And no, sound quality doesn't differ. Digital == Digital. When electical interference affects the signal when it runs over coax, the decoder will stop for a second before picking up the signal again (like you would pull the plug out of the socket for a second).