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Separating your PC electricaly from your receiver is good, from that point optical is better than coax and RCA. Especially if you have a TV-card in your PC. The ground loop antenna-PC-receiver sounds really bad (a hum). Otherwise optical and coax is the same, i.e digital. Many perfectionists don't like the extra conversions needed when using optical cables, electrical-optical-electrical, since it can give jitter errors. But for a PC sound...
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