TTBy Tonetron Engineering Team · Dongguan Taitron Electronic Limited
How far can a copper HDMI cable run?
It depends on bandwidth and conductor gauge, and the limit falls as bandwidth rises. Beyond it, the answer is AOC.
Answer: there is no single number — the limit falls as bandwidth rises, and it depends on conductor gauge. Beyond the practical copper limit the correct solution is an active optical cable (AOC), not a thicker copper cable.
A supplier who quotes copper for a run that only AOC can do has not tested the distance.