IPOD Speaker System
| The coil of an electromagnet, called a cropland coil, was energized by current through a second pair of connections to the driver |
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| This winding regularly served a bifold role, acting also as a choke coil filtering the capability supply of the amplifier to IPOD Speaker System which the loudspeaker was connected |
| AC ripple in the faddy was attenuated by the alertness of passing through the choke coil; however, AC line frequencies tended to modulate the audio signal being sent to the exclamation coil and added to the audible hum of a powered-up sound reproduction device. |
The most common type of driver uses a lightweight diaphragm connected to a rigid basket, or frame, via flexible suspension that constrains a coil of fine wire to measure axially through a cylindrical magnetic gap.