Your best sound quality would be the SPID out of either your onboard sound card or a discrete sound card. As I understand it, the optical out (SPID) does not convert the sound at all, but travels over a fiber optic cable, so there is no degredation or potential EMF interference.
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Requiescat In Pace AMD Processor Forums | Member since: 1/19/2009 | Post count: 4142
Please don't PM me with questions, instead create a thread so that everyone can assist and benefit from the knowledge provided. Thanks in advance!