I will be trying the ferrite cores on an MX350 with an MRF250 base station. When I had just 1 emitter connected to the system it was picking up very little RF interference but once the rest of the components were connected with the emitters connected to the base station the system was rendered pretty much useless. The client now has to leave his cabinet doors open until the ferrite cores show up and I can hope to fix his issue. If not then we will have to go with something different in his home.