Synchronize zones

I have three zones in my home, all interconnected with hard wired network (no wi-Fi ) yet one zone has a delay from the other two. If check setup and there are no delays introduced.

Can someone point in the right direction to solve this ?

Thanks

I located the problem ! The room who’s is out of sync is running a Convolution filter !! Adding delay to That system.

Let us know, if that worked for you!

Just for background, I had found in the past that setting the same delay for both stereo channels doesn’t introduce any delay relative to other end points.
My fix was to shorten the impulse window in REW to just before the signal rises.

Martin that’s great advice, my other rooms don’t use convolution filters … but I will look into it
Thanks Very much