I've used three different optical cables, none of them glass. I've also used several different coax digital cables. I could never identify any difference in sound between the optical cables. There were some slight differences in coax cables -- I have one coax cable that I thought sounded a little better than the opticals, but since my current DVD player only has an optical output I'm not using it. If I had a coax output, I'd probably be using it, but since I don't I'm using the PDO from Outlaw (which is significantly cheaper than the other two optical cables I've used). As for PCA or PSC for coax, use the PSC -- it's rated for 75ohm (digital coax and video applications), while the PCA is not.

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