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This video describes how a tone control circuit and graphic equaliser works with the help of pratical demonstration. Tone control circuits are basically filter circuits which are used to filter audio frequency signals so that only the desired range of frequencies are allowed to pass to the amplifier and the loudspeakers. This enables the listener to customize the music output with either a high level of low frequency content through bass boost, or an increased level of high frequency content through a treble boost. A graphic equalizer (graphic EQ) is a high-fidelity audio control that enables the user to improve sound quality. Sound quality captured by sources, such as microphones and instrument pickups, is adjusted by changing the individual frequency bands of the audio.

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