I have been going back and forth with KEF support and finally have made some progress or at least received clarification. They have explained some of the behavior and acknowledged that they will need a firmware fix at least for the HDMI/TV issue. Here is the most recent information with my text in bold. Looks like there will be a firmware update at some point. I would encourage anyone who is experiencing unexpected or unwanted behavior with standby mode or turn-on/turn-off to contact KEF support.
Okay, thank you; the team really appreciates the way you laid this out for us and how you troubleshot. I have confirmed a couple things below with the DEV/UX team.
With the HDMI cable inserted, the TV turned “off” and the KEFs set to TV as “secondary wake-up” they will cycle on and off on their own.
We suspect that the TVs keep on sending signals to the LS50WII even in Standby. The team is working on a fix – each brand and each TV model handles these protocols differently, and some stop sending a signal, and some keep sending a signal. This fix will be in a future firmware update
With the HDMI cable inserted, the TV power cord disconnected and the KEFs set to TV as “secondary wake-up” they will not cycle on and off on their own.
Correct, expected behavior as TV is not outputting signal anymore
With the HDMI cable inserted, the TV turned “off”, and the KEFs set to COAX as “secondary” wake-up they will not cycle on and off on their own.
Correct, expected behavior, as we stop listening to TV signal in Standby and only to COAX signal
With the HDMI cable inserted, the TV turned “off”, and the KEFs set to COAX as “secondary” wake-up they will not turn on when music is initiated via COAX. Once turned on they will go to standby 30 minutes after music stops and stay there
This is expected behavior and requires a bit of explanation. Second source wake-up for coaxial and optical are based on whether there is an active signal or not. The assumption is that when the external device goes to standby and the signals are disabled as well (this may not be true for older devices that just leave everything on, as they don’t need to meet any power requirements) – but a power off/on should do that.
Why doesn’t it work through an active music signal?
Because in Standby we would have to turn on the DSP to listen to an active signal, and when the DSP is ON, it is no different from having the whole speaker ON. Hence, we can listen when there is no signal coming through (because the DSP is on) and can go into standby. So overall, yes expected behavior.
If you were to power cycle the COAX/Optical Device, after the speakers have powered off they should power back on
Initiating music via Qobuz through the KEF Connect app will turn the speakers on. They will go to standby 30 minutes after music is stopped and remain in that state.
Correct, when there is no audio playing, the speaker goes into idle time and will go to standby
I see no options other than either my pair is defective or the new KEFs need a fix. You have said that you do not think that my speakers are defective. Please prove your point through troubleshooting suggestions. What could cause these two separate issues involving both COAX and HDMI use in the standby option to seem similar?
To assure you, your speakers are not defective. This is due to the technical limitations. As for the TV, this a bug that we will fix in upcoming firmware release.
If you wanted to match power off time with the coaxial or optical device and the speakers, this should allow both to power on/off in tandem. Again, the coaxial or optical devices will need to powered off and then on to power cycle the speakers.
Please let me know if you require further explanation. To reiterate, Coaxial/optical devices will need to power cycle to re-engage the speakers after they power off; your TV model issue will be resolved in one of the next firmware updates.