FWIW when I switched the D9200 cable with the D7200 cable, I had the definite impression the D9200 sounded better (less treble bite but no less resolution) with the D7200 cable and vice versa, the D7200 sounded slightly different with the D9200 cables (more treble definition). So I would use silver plated copper cable with the D7200 and pure copper for the D9200.
Maybe it's the placebo effect of the change itself plays a part, but check it out if you can.
IMHO one of the best silver plated copper headphone cables (and also the pure copper cables) are made by Stax.
One could get replacement cables for Stax and modify the terminations. However, it's quite heavy and long cable - though one could cut off 2-3 strands and keep only 4-3. Still, for that price I guess one could get the D9200 cables or 3rd party silver plated copper cables directly.
Personally I prefer the Stax pure copper cables (e.g. Stax SRE-725) over the silver plated ones (e.g. Stax SRE-925s) and they are more than twice cheaper. Though for the D7200 you might want the SRE-925s.
I am sure when it comes to cables, people will have dozens of choices and preferences, the ones above are just mine, YMMV.
Maybe it's the placebo effect of the change itself plays a part, but check it out if you can.
IMHO one of the best silver plated copper headphone cables (and also the pure copper cables) are made by Stax.
One could get replacement cables for Stax and modify the terminations. However, it's quite heavy and long cable - though one could cut off 2-3 strands and keep only 4-3. Still, for that price I guess one could get the D9200 cables or 3rd party silver plated copper cables directly.
Personally I prefer the Stax pure copper cables (e.g. Stax SRE-725) over the silver plated ones (e.g. Stax SRE-925s) and they are more than twice cheaper. Though for the D7200 you might want the SRE-925s.
I am sure when it comes to cables, people will have dozens of choices and preferences, the ones above are just mine, YMMV.