I’m adding this here, as it’s something I’ve done as a result of the reading I’ve done on EM fields and shared in this thread.
I place large steel cylindrical door stoppers on my equipment. Before, I used to put it smack in the center, but now I place them directly above the power transformer.
This video shows what happens to a free flowing magnetic field when a metallic object is placed in it. The transformer on the BHK Pre is right of center and I’m placing the cylinder directly above it.
I have a cheap magnetic field detector sitting with it’s sensor pointed towards the former. The cylinder, afaik, is not magnetized–screws don’t stick.
Theory says that magnetic field lines will look for the least path of reluctance (similar in theory to resistance for electric fields), usually in metallic objects.
You’ll see that the field strength to the meter goes down when I place the cylinder over the former. The theory says that the magnetic field lines are now flowing into the cylinder – and likely turning into heat.
What does this mean? I take it to mean less magnetic energy is interfering with other equipment because it’s being drawn and possibly dissipated by the cylinder. It would be nice to be able to see the field lines to know exactly how the new shape looks, but you can see adjacent field energy goes down with the cylinder in place.