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- T-yoke
The back plate of the motor structure and the pole piece extends up to the center of the voice coil. The combination of these two is referred to as the T-yoke, which provides a method of focusing the opposing force of the magnet towards the location of the washer. This opposing force forms a magnetic field with the washer that is used to create a reaction with the alternating field established by the voice coil. As with the washer, the T-yoke uses a low carbon steel structure of cold heading quality. This steel structure in many cases also serves the purpose of ventilation. By boring a hole through the pole piece, air is then moved back and forth to effectively cool the voice coil. The pole piece of the T-yoke also draws heat from the voice coil, acting as a heat sink. Both the ventilation and the drawing of heat can significantly improve the performance of the loudspeaker.
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