Note just like the magnetic field in a hard drive, the magnets used in transducers concentrate their flux right where the voice coil is. You'd have to put your head INSIDE a Beyerdynamc Tesla driver to experience a flux similar to that of an MRI machine.
Any takers on the Tesla implant?
Nobody can prove there is no magnetic effect from them just as nobody can claim that cellphones do not cause brain tumours.
"Magnetic effect"? In what way, other than the aforementioned ear fluid that is being excited by MRI magnetic fields many orders of magnitude larger than those from consumer devices?
Look, just like with cell phones we can't just go ahead and say "this might hurt us" and fear it enough that it influences our behavior despite the overwhelming evidence that any effect that such a phenomenon (cell phone EMR, magnetic fields from headphones, etc.) may have, positive or negative, is extremely small. This isn't like Minimata, nor is it like smoking - and it isn't even like the entirely natural yet oh-so-damaging rays of the sun.