Oppo Digital PM-1 Planar Magnetic Headphone Review
July 13, 2014 Comments Off on Oppo Digital PM-1 Planar Magnetic Headphone Review
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“Notice that when you go outside the large ring magnet, the magnetic flux changes direction. In order to take advantage of the magnetic field here and create a larger driving surface, the rotational direction of current in the spiral circuit traces are reversed, causing motor force to be aligned with that of the circuit traces between the ring magnets.”
Audiophilepure 
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