"Jim Lesurf"
Eeysore

An optical link has the potential advantage of eliminating 'ground loop
problems' (research into these is advised if you're into hi-end systems)
since there is no so-called 'galvanic connection'.

Since you don't define the term it is hard to disagree. :-)

However, in reality it is quite easy to get contacts which are essentially
Ohmic. i.e. which show no real sign of nonlinearity.


** Who mentioned " nonlinearity " ??

Maybe the term " galvanic" has you flummoxed.



...... Phil