Roscoe Primrose wrote:
A solution in search of a problem....
Right there!
From an engineer's perspective, we are talking about EMF influence on the pico, nano or micro-watt level, whereas we are supplying signal to the speakers several orders of magnitude above this. Any possible effect will be swamped out by the amplified music signal. It might be something really useful for source components, like phonostages. That being said, if amplifier driving the speaker is high gain and has a global feedback loop from the output terminal of the amp, there might be some injection of noise that can occur and is amplified.
The ham radio operator a few houses down from me have kept me on my toes over the years dealing with RFI issues, but fortunately, that now seems to be confined to listening to phono. I get less noise from low impedance moving coil, than high impedance moving magnet, even though the latter is 15 to 20dB higher signal level from the cartridge. No problem with digital (line level) inputs. When he starts up his rig, then I just switch sources and keep happy.
David