If different ethernet cables have audible differences then it stands to reason that IOP will be an even bigger factor. It would not make sense to run listening tests on various ethernet cables without testing such a key factor as IOP at the same time.
On the flip side if IP is robust enough to go over wifi, ethernet, optical or IOP and through countless servers reliably and perfectly then there should be no audible difference between various cables and/or IOP (if all the components work properly)
On the flip side if IP is robust enough to go over wifi, ethernet, optical or IOP and through countless servers reliably and perfectly then there should be no audible difference between various cables and/or IOP (if all the components work properly)