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Advantages of Dynamic Microphone | disadvantages of Dynamic Microphone

This page covers advantages and disadvantages of Dynamic Microphone and its basics. It mentions benefits or advantages of Dynamic Microphone and drawbacks or disadvantages of Dynamic Microphone or moving coil microphone.

What is Dynamic Microphone?

Introduction:
It consists of coil of thin wire wound on a cylindrical tube which is attached with light disc. The light disc is known as diaphragm. The assembly of coil and tube is placed along the axis of a permanent magnet.

Due to its construction and working it is also known as moving coil microphone. It is used as handheld microphone by singers and speakers where ruggedness is desired.

Dynamic Microphone working
Figure-1 : Dynamic Microphone construction and working

When person speaks in front of diaphragm, it makes coil and tube assembly to move in and out. Due to this vibrational movement in the circular gap between the poles of permanent magnet, electromagnetic induction occurs. This creates small alternating current in the wire. This results into AC voltage across the coil. The voltage is amplified using amplifier and fed to the speaker to reproduce as amplified sound.

Benefits or advantages of Dynamic Microphone or moving coil microphone

Following are the benefits or advantages of Dynamic Microphone or moving coil microphone :
➨It is one of the good quality microphone with omnidirectional properties.
➨It is available at affordable cost.
➨It is rugged in construction (almost 100% mechanical) and can handle high pressure levels.
➨It does not require any battery or power source to run.
➨It can convert sound waves over entire audible range to electric current (or voltage) for further use.
➨It is durable which can withstand lot of volume.
➨It colors the sound in the range between 5 to 10 KHz which adds clarity, presence and understandability to many vocal and instrument sounds.

Drawbacks or disadvantages of Dynamic Microphone or moving coil microphone

Following are the drawbacks or disadvantages of Dynamic Microphone or moving coil microphone :
➨It has poor high frequency response due to inertia of coil, tube & diaphragm and force required to overcome interaction between coil and magnet. Hence it is not suitable for recording instruments with higher frequencies and harmonics compare to condenser microphone.
➨This microphone type miss many sounds as it requires lot of sound pressure to move the coil.
➨It is not as accurate (or sensitive) as condenser microphone. Hence it can not be used for in-studio film productions.

Conclusion: In order to understand advantages of Dynamic Microphone and disadvantages of Dynamic Microphone one has to understand all the other microphone types >> such as Carbon microphone, Condenser microphone, MEMS microphone, Electret microphone etc.



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