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(Note: this is not available as a separate part.)
Magnetic shielding of the parts in a speaker becomes important when the magnet structures will be placed near a cathode ray tube type monitor (old TVs, oscilloscopes, etc.).
The stray magnetic fields will cause the streams of electrons inside the tube to curve in their paths, hitting the wrong phosphors on the front of the tube. This can result in some pretty bizarre effects (none of which are permanent). These effects are only interesting for about 90 seconds, after which they simply would be described as "ruining the picture."
To prevent this, we alter the magnet structures of drive units so they do not radiate strong fields outside of the speaker cabinet. In the case of most of the HUMAN drivers, this is accomplished by adding a second magnet on the rear of the assembly, with a reversed polarity.
I always prepare the parts for the C2 center channel this way; upon request and for a slight additional cost it can be done to any model, if you will be using them near a monitor.
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