Skiwall1 - 48 minutes ago »
Ok. So it's a bit late but here's what I've found. The issue isn't specifically a 'problem' with the hummy box, more of a feature, I'll explain. Pin 13 of the HDMI connector is used for all Arc and CEC comms between devices. Its used to swith other devices on or off remotely. The 4000T has the ability to swith on the TV as the hummy box switches on and this is done via pin 13. The issue with the hummy box is that whilst in stand by it's still periodically talking on pin 13 (software issue from Humax) and this causes interference with other CEC devices and that includes Arc. There are currently 2 work arounds:-
1) change the sttings in the hummy box power management section to prevent auto stand by and simply leave the hummy box on. (Obviously this isn't always the best for power consumption, hdd life etc)
2) buy a CEC isolator adaptor (£10) which basically removes the pin 13 connection between the hummy box and the TV. You simply plug it in to either end of your HDMI lead and the problem goes away.
http://www.lindy.co.uk/cables-adapters-c1/audio-video-c107/hdmi-cec-less-adapter-female-to-male-p7299
By the way, this issue isn't just caused by Humax boxes. Sky Q and other PVR devices can cause issues with sound bar / amp control
Welcome to our Forum 
HDMI CEC can be switched off in the system menu.
