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Does the 1.5m 75ohm rule apply to 110ohm?

I’ve read many times that 1.5m is the best length for SPDIF.
Al Marg’s (RIP) excellent explanations come to mind.
Does this rule apply to XLR 110ohm digital cables as well?

Please don’t turn this thread into a ’bits are bits’ carnival.
If you have nothing but negative opinions please don’t post.
rja
mesch
3,530 posts
 
So the answer is that 1.5 M is the best choice for AES digital cables if one doesn't know the input impedance of the receiving component?
kijanki's avatar
kijanki
4,477 posts
 
@mesch   Input impedance of receiving component has nothing to do with it.  We assume 1.5m minimum for average system.  In some systems 0.5m might be enough, while others will require 2m.  The whole point was that longer cable might be better (counterintuitive).
mesch
3,530 posts
 
Thanks, I read too much into your statement of 5/15. 
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