Im sorry but dont understand, why dont you connect OR5-M7 with cat5/6/7. Sorry forma the stupid question. Why do you want to use hdmi ?
HDMI would probably be superior to the RJ45 but the Master 7 does not have an HMDI input. I use CAT 5 now but Steve N. at Empirical Audio (maker of OR5) told me not to use CATs for the RJ45 I2S and when pressed for cable type said that I should buy their $400 cable. The confusion on my part comes from lack of a spec defining I2S on the RJ-45 connector and trying to figure out what is best with the limited information. So maybe Kingwa will respond and set us straight.
Edited by DACLadder - 10/26/13 at 2:08pm