@ROSELOA Upon further testing, I don’t believe the 150b is at fault.
I took the optical out to another new Parasound Halo P6 pre-amplifier and there was no signal at all from this Apple TV > LG 1080 television.
However, when I connect a Chomecast HDMI device > LG 1080 Television > Rose 150b > Parasound P6 pre-amp > Schiit Aegir poweramps > speakers, and stream content there is no appreciable delay.
Same thing with this signal path:
Chomecast HDMI device > LG 1080 Television > Parasound P6 pre-amp > Schiit Aegir powersmps > speakers
So, I would conclude that the older LG 1080p television either cannot process this older optical signal from the Apple TV and convert it efficiently enough for the Rose 150b to pass it to the pre-amp/power amps…and in the Halo P6, it isn’t even present.
I believe, if I get a more modern Television (with eARC output > Rose) I will be served an in sync signal from the Apple TV HDMI device.
What do you think?