Hi Din,

Fascinating answers from Steve, and there is also the inverse square ratio law is at work here. Without looking it up (anyone well versed in this?), the farther you move away from the magnetic source, the magnetism drops off rapidly (it isn't a linear drop). At a distance of two feet, unshielded speaker magnets would have no effect.

The same law comes into play with Sound Pressure Levels vs. power requirements for speakers as you increase the distance from the loudspeaker.

Regards,

Alan Lofft,
Axiom Resident Expert (Retired)