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- Resonance
frequent ringing or buzzing
- attenuation
To reduce the intensity of sound waves
- decibels
It is the unit for measuring the level of sound.
- Microphone
It is a device used to convert sound waves into electrical signals.
- Microphone Mixer
It is a device used to combine two or more electrical signals.
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- Amplifier
It is a device used to amplify (i.e. increase power) electrical signals.
- Amplified Speaker
This speaker has a built-in amplifier.
- P.A. System
It is an abbreviation for Public Address System. A PA system consists of a microphone, mixer, amplifier, speaker, etc.
- Feedback
It is a ringing noise that is produced when a microphone reproduces the sound taken from the speaker.
- Sound Source
It can be a speaker, singer or an instrument, or any instrument that produces sound.
- Frequency Response
It is in a way that a microphone-like device or a room-like environment responds to different frequencies.
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- Flat Feedback
This means that a device as a microphone responds in the same way to different frequencies i.e. whether the frequency is high or low, the device is going to respond in the same way. The flat response may not occur in any device or environment. However, they can have an almost flat response.
- Ear Plugs
This device is used to attenuate sound waves. It is worn by people who work in noisy places such as clubs to prevent permanent hearing damage.
- Noise Reduction Rating (NRR)
Any device whose NRR is less than 20 dB (decibels) is of no use
