1. The central controller system vibrated the electromagnet like an audio-speaker voice coil . 2. Rotary voice coils are widely employed in devices such as disk drives. 3. A rotary voice coil is a rotational version of a solenoid. 4. The voice coil and the magnet form a linear electric motor. 5. Inaccurate reproduction of the voice coil signal results in acoustical distortion. 6. Copper wire provides an easily manufactured, general purpose voice coil , at a reasonable cost. 7. They block the power amplifier from taking maximum control over the voice coil motion. 8. The voice coil is attached by adhesives to the back of the speaker cone. 9. Level shifts caused by resistive heating of the voice coil are termed power compression. 10. A second pole piece in turn surrounds the voice coil .
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