[quote=“strangely, post:10, topic:168617”]Just remember that things will also get interesting if you have HDMI CEC enabled on other devices (it may be by default on your TV’s etc) and you’ll find that if using an HDMI matrix switch, that the HDMI CEC messages will go across every HDMI cable and device on the matrix, and you can then have all sorts of things turning on and off 
The good thing is that these IR injectors also use the HDMI-CEC wire, and they serve to block the signal… This is actually the other reason why I wanted to use these as I’m using HDMI-CEC locally at each TV for my TVs and AV receivers!
Which Matrix switch are you using?[/quote]
CEC idea seems to work, I have tested it a few times and signal is transmitted after receiver is “off” and does not seem to affect other devices on the matrix.
Trying only input IR Infect on other HDMI cables with only one output on main HDMI cable did not work.