Optical or Coax digital

If I recall correctly, the only time optical might actually be better is if you are doing a ridiculously long run of cable. I could be wrong on that though. But for most home audio applications coax is better.

Coax is better except (a) as pointed out above very long runs and (b) if the digital source has rf contamination or grounding problems as can be the case with Digital Satillite music. I subscribe to the 100+ channel DMX service and actuallly convert the coax to optical using a Theta Linque to establish an optical gap from all the rf junk that gets through the coax. I use completely seperate AC for it as well.

I seem to be the odd one out and prefer AT&T optical. But, only if you use a very good optical cable - most of the industrial types sound awful, and the guage of the fibre needs to be right, and you need to use suitable termination aids like the Theta gel-like stuff. A very good optical cable will sound cleaner, more detailed and more dynamic than very good coax, but the clincher for me is that coax always (at least for me) adds an artificial warmth due to earth noise. To validate the last comment - I hear this earth noise even if I listen to the AT&T connection, when the coax cable is left in place - but the earth noise is removed when the coax is removed. I can well imagine that for some, the added warmth of the coax is preferred - but since it is actually noise, then I suggest the problem should be fixed elsewhere.