Overhub PSU issues. Studio Hiss

Hello,

I have a very annoying high frequency “hiss” or usb noise in my studio. throught the mixer, monitors ect. I tried to search the cause and I found out that it’s only there when I power on my OVERHUB, or better said, when I plug in the PSU for powering my overhub.

I have a PSU that can deliver 3A current for the overhub. Maybe it is too cheap for it’s purpose.
Has anyone found a good quality PSU for the overhub or can advise me another solution?

Kind Regards Ben