This might be solvable with some ferrites. First up, these: https://www.dxengineering.com/parts/dxe-csb31-525-5 These should go on the DC out from the Meanwell brick...open one up, loop the DC out line around it a couple of times right next to the brick, then snap it closed. That'll kill any RF on the DC line before it gets into the cab.

the power brick from intellijel already has that thing included might not be it.
but maybe I should get a new power brick
on the other hand there is still the noise in my girlfriend Intellijel 3 u /64 system :((

j.manuel