my glass optical "sounds" the same as my plastic ones; not much different even from my digital coax.
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Recently I was surpised at the difference an Amphenol glass optical cable made (over a good quality plastic opt cable) to a friend's surround system.
The sound improved. All the channels seemed to settle in (jell), and the front end (c & l/r) was noticably tighter and more liquid. Quicker. A far more "real" sense.
The WAF showed an immediae high approval rate!
I'd never consider it for audio/music (nor would he), but for DVD/SAT movies what I heard was a significant improvement.
But not in the same league as a coax dc.