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Tone control is a type of equalization used to make specific pitches or frequencies in an audio signal softer or louder. It allows a listener to adjust the tone of the sound produced by an audio system to their liking, for example to compensate for inadequate bass response of loudspeakers or earphones, tonal qualities of the room, or hearing impairment.
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Some audio components such as tone controls are designed to adjust the loudness of signal content at particular frequencies, e.g., a bass control allows the attenuation or accentuation of low-frequency signal content, in which case the specification may specify the frequency response is taken with tone controls "flat" or disabled.
In the branch of experimental psychology focused on sense, sensation, and perception, which is called psychophysics, a just-noticeable difference or JND is the amount something must be changed in order for a difference to be noticeable, detectable at least half the time. [1] This limen is also known as the difference limen, difference threshold ...
Later, the single tone control was replaced with two controls, one for the bass and one for the treble. The two together were called "tone controls." Later the tone controls were replaced on some high-end audio devices with an equalizer control (or just "equalizer") which had multiple slider knobs, each one controlling a range of tones.
Key signature change example: C major to C minor. In music, modulation is the change from one tonality (tonic, or tonal center) to another. This may or may not be accompanied by a change in key signature (a key change). Modulations articulate or create the structure or form of many pieces, as well as add interest.
The Fender Bassman was the first amplifier to standardize the tone stack design. Dubbed the 5F6-A from the Fender model number of the amp which first used it, this tone stack offered the performer the ability to control the amplifier's low, mid, and high frequency response independently.