Sync issue with two amps

[Coyote90]

I have two WiiM standard amps. They each drive a pair of outdoor speakers. I had trouble with them playing in sync when I first bought them a couple years ago. One of the firmware releases fixed the issue and they worked perfectly. However it’s probably been almost a year since they have worked properly. There is about a 2 second delay between them. I have tried everything. Any advice?

 

[Burnside]

Try group audio delay under audio input for the leader amp in the group.

 

[Coyote90]

There's no ability to change that for WIFI.

 

[Mr Ee]

There's no ability to change that for WIFI.

Yeah, it's fixed at 800ms.

A 2 second difference is massive.
This is with a Wiim group, right? What are you playing?
Never heard of that amount of difference before.

 

[Coyote90]

It’s the same delay if I use a group or not. Spotify. Iv tried Spotify connect through the Spotify app, or using the WiiM app. The only way I can make it work is playing music through my tv and running optical input to both amps.