With so many China brands out there does anyone know where u can find a certified list of long distance cables? Hdmi 2.1 cable.
For long cables you have to use a hybrid optical cable. The video goes via optical and the audio via copper. Ruipro are a good example of a quality cable.
These cables need a converter at each end, so they are directional. None of these cables are certified, as they all draw too much current from the HDMI board and are ALL out of spec. So you need to use a voltage inserter with these cables so that you don't blow up the HDMI board.
If you need a cable longer than 12 ft. then you should be using a hybrid active cable and none of them can be certified.
That is just one of of many daft situations that HDMI with its HDCP specs causes to happen.
I have been using a 35' Ruipro hybrid HDMI cable with voltage inserter for four and a half years without issue.
If you have a cable that length make sure you place it in conduit, or you will be very sorry.