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In Reply to: the old coax vs. optical test in digital cabling posted by bartc on April 8, 2007 at 07:43:34:
HowdyBesides the differences in the transmitters/receivers mentioned, another potential confounding difference is that coax might cause a ground loop or be more sensitive to EMI/RFI either of which which may or may not cause audible differences downstream...
As to the gain difference: the biggest surprise I ever had was that changing the power cord on my transport which was connected with glass fiber to my DAC changed the gain... What the heck?
Follow Ups:
Hate to ask this silly question ? But it seems improbably. The increase gain is possibly just an apparent increase, caused by better jitter characteristics with the new power cord.
HowdyYep, I figured it was jitter (what else could it be?)
The biggest difference was that the bass was much tighter with one cord than the other, perhaps this accounted for the perceived level difference. The level difference was hard to measure with a RS SPL meter in that finding a consistent spot to measure with real material wasn't too reproducible. I didn't bother to check test tones...
Ok, most probably, it is just improved jitter. Even with my Squeezebox, after the mods, everything sounded louder. One good thing with the computer approach is, even though there is jitter always, the nature of the sound is not 'edgy'. It must be something to do with the 'jitter spectrum' not dependent on varying things like the transport/cd surface.
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