Is the line in on a ZP totally unusable for a video source? e.g. DirecTV receiver plugged into a ZP for ceiling speakers in adjacent rooms

I use my CONNECT as the amp for my TV. Analog audio out of TV into CONNECT. HDMI sources into the TV. No noticeable delay at all. The auto-on for the line-in source is awesome. Turn the TV on, and the CONNECT automatically selects the line-in source at a preset volume level. Now if you were to come directly out of a source with analog audio, and send the HDMI to the TV, maybe there would be a bit of a delay. Only one way to find out. Try it and see. I have seen others mention a delay processor that goes inline between an analog source and processor, but I do not recall who makes it or what it is called.

i have a ZP90 connected to a DirecTV box in a kitchen with analog audio inputs. the ZP100 is in the rack in another room connected to in-ceiling speakers in the kitchen. they are connected via hardwired network. no delay. i couldn't believe it when i first tried it.

[Link: motron.com]

I've experienced the delay with analog inputs into Sonos, but haven't tried it for 6-8 months.  Maybe they've improved it with recent updates?

An audio delay device won't help with this, because they audio is already delayed behind the video.  You'd need a video delay device to correct the issue.

I'm not in front a system to check...can this feature be disabled similar to the Sonos dock priority override? In other words I do not want the Sonos to automatically switch to the line in source when the line in source becomes active.

I was under the impression that it was the TV's processing of the Video signal that inserted delay (video) into most systems with lip-sync issues.

Analog audio processing is fast-enough to not cause significant delays.

This is why if you run, for example, HDMI to your TV and then the audio out from the TV to an amplifier the audio and video is in-sync, but if you run analog audio from your source direct to the amp and video to the TV you get lip-sync issues.

I could be wrong...

Delay varies based on the compression level, no compression and it's not even noticeable, add compression it adds delay. You can set the compression on/off on the line inputs.

The SonosNet will automatically adjust all Sonos playback devices to keep the sound in sync, but it can't sync to a third party amp unless it's driven from a Sonos line level output.

Yes you can disable it. New in 3.6 I believe.

It's possible that the systems described with no delay happen to have audio delay and the TV delays the video about the same amount, so... no delay.

Farmhand walks by the boss, limping badly. Farmer asks what happens, farmhand says he whacked his leg with a shovel. A few hours later, farmhand is walking very evenly, though maybe a bit stiffly. Farmer asks how come the limp is better. Farmhand says, naw, it's not better; whacked the other leg, too. You can't limp on two legs!