[CedssypeEdids]

For Hermetic magicians, the dual animating principle of the soul, body and everything alive is of Fire and Water elements, which express themselves in the electric and magnetic powers amongst other things. Electro-magnetism is present in your body, and just maybe in your other energy bodies as well. At least in the etheric one, which animates and regulates the physical one, and is the bridge from the physical to the immaterial.

Electro-magnetism surely can induce a crackling sound in a speaker. You said these are active boxes. So they are already powered. A much smaller EM signal is needed for interference, only a non-powered device would need as powerful a surge as wstein suggests. Like when you a handy is transmitting (a SMS comes to mind - the du-du-dut noises you get when it is transmitted and you are close to a speaker), other signals can be heard over the speakers.

Maybe the shift of consciousness from the etheric to the astral does send out a notifiable surge of electro-magnetic waves. Robert says, that the projection is felt in the RTZ/astral surroundings, I think he wrote it in AD that often enough entities panic and leave the area, IIRC.

Oliver