WiiM Pro Plus - PCB version 4 What is the improvement from older versions?

[muchacho]

Hi, I have just bought my fourth Pro Plus for my house. The previous ones have PCB 1, 2 and 3, as I bought them one by one. The last one, to my surprise, has PCB version 4. Does anyone have any information on what is improved in the latest version 4?

 

[Burnside]

I don't recall any improvements being mentioned for PCB 1, 2 and 3, so wouldn't expect such for v4. Maybe it's as simple as a change in actual components due to availability that doesn't necessarily change its performance.

 

[FuckaZip]

In recent months, manufacturers have frequently discontinued PCB materials. Maybe this may simply be a change in materials.