Disturbing hum from the DDJ-WEGO3 AC/DC power supply out in speakers

Hi,
I have a DDJ-WEGO3 with an iPad 3, connected to a Yamaha MG10XU mixer. The mixer is then connected to different PA-systems depending on the venue.
There is a very disturbing hum/noise from the DDJ-WEGO3 AC/DC power supply that goes out in the speakers. I have isolated the hum to the power supply of the DDJ-WEGO3.
I have set a Ground Loop Isolator on the rca-cable from the controller to the mixer and the hum/noise is somewhat diminished but not enough.
Any ideas what could be done? Anyone that has had similar issues?
Cheers, Jonas