When you do the measurements it is often very surprising, as too what turns out
ot be magnetic, and what is ok.
Remember for far field measurements a magnetic field drops of at an inverse
cube rate (approx.).
So being very crude with the equations (as the physics often hurts my head), if
you h
JBL Professional Audio makes heavy duty loudspeaker drivers which feature the
traditional big magnet at the back. These items are airfreighted all over the
world daily. I recall seeing an airfreight label on the cartons which declared
the contents to be 'magnetic'. The figure given in a recent
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