I have three different cases from Pittsburgh Modular, all of which are giving off a high-pitched whine.
Does anyone know how I can get rid of this?
Is it a power brick issue?

Here are the cases with modules in place at the moment:
ModularGrid Rack
ModularGrid Rack
ModularGrid Rack

The Pittsburgh Modular Voltage Research Laboratory is especially noisy beside the Lifeforms SV-1.
When I take out the VRL and only have the SV-1 in there, it is silent.

It's really frustrating to have such loud interference in the signal, after having spent a fortune on this equipment.
Any tips or solutions would be greatly appreciated.