Wiim ultra causing hum

[Minty]

@jdjd1 have you tried a rca ground loop isolator?

If not, you could try a cheapish one to see if it fixes the issue, and if so, look for a better quality unit if you feel it’s required.

 

[slartibartfast]

WiiM Amp Ultra and Sub Pro are only WiiM products with 3-pin power plug. Knowing a ground loop as potential issue, I don't understand why other WiiM products do not have power plug with ground pin.

Ground loops are more likely with a 3 pin plug. How can a ground loop exist if there is no ground connection?

 

[Vladetz]

Had almost same issue. Isolated ground on sub power cable and hum is gone