Question

who many fields did the speaker cross to reach the field ?​

Answer 1

Explanation:

A loudspeaker is an electroacoustic transducer;[1] a device which converts an electrical audio signal into a corresponding sound.[2] The most widely used type of speaker is the dynamic speaker. The sound source (e.g., a sound recording or a microphone) must be amplified or strengthened with an audio power amplifier before the signal is sent to the speaker.

Answer 2

Answer:

Electromagnetic Dynamic Speakers. The field coil is often used as the filter choke of the receiver power supply. The DC current passing through the field coil creates a strong magnetic field to operate the speaker. Because the field coil is used as the filter choke, it can have a high hum component.