In an amplifier, a presence control boosts the upper mid-range frequencies to make the sounds of voices and instruments with similar tonal ranges seem more "present". On television production studio's sound desk, there can be several presence controls, for several different, switchable, frequencies. There is a limit to the flexibility of such controls, and they are sometimes insufficient. If the degree of mis-match between microphones is great, simply increasing presence is not enough, and instead a sound engineer will use a graphic equalizer, sometimes several, each connected to an individual sound channel. Presence controls can also be found on electric guitar amplifiers. The first presence control on a Fender amplifier, for example, appeared in 1954 on the Twin. In 1955 it appeared on the 1/15 Pro-Amp, the 3/10 Bandmaster, the 2/10 Super, and the 4/10 Bassman. The original Fender presence control acted upon the amplifier's negative-feedback loop. As the level of "presence" was increased, so more and more of the higher frequencies in the negative-feedback loop were dumped to ground, leaving the low and mid-range frequencies. Increasing the presence resulted in there being less and less negative feedback on high frequencies. The effect varied according to amplitude. Later Fender amplifiers used a different presence control. The presence control on the 1975 Fender Super Twin did not modify the negative feedback loop, but was an active equalization circuit, controlling the 3.9 kHz frequency range. It had the ability to both amplify (boost) and attenuate (cut), unlike the earlier presence control.

From Wikipedia (CC BY-SA 4.0).

Notable quotes

“Captain James T. Kirk: But one man can change the present.”
— Star Trek: The Original Series episode Mirror, Mirror (6 October 1967) by Jerome Bixby
“There are those who regard this history of past strife and exile as better forgotten. But, to use the phrase of Yeats, let us not casually reduce "that great past to a trouble of fools." For we need not feel the bitterness of the past to discover its meaning for the present and the future.”
— John F. Kennedy, Speech to a joint session of the Dail and the Seanad, Dublin, Ireland (28 June 1963)
“In an era of stress and anxiety, when the present seems unstable and the future unlikely, the natural response is to retreat and withdraw from reality, taking recourse either in fantasies of the future or in modified visions of a half-imagined past.”
— Alan Moore, Watchmen
“We do, however, speak a message of wisdom among the mature, but not the wisdom of this age or of the rulers of this age, who are coming to nothing.”
— Paul of Tarsus, 1 Corinthians 2:6 NIV
“Whereas before you dwelt in time and paid brief visits to the Now, have your dwelling place in the Now and pay brief visits to past and future when required to deal with the practical aspects of your life situation.”
— Eckhart Tolle, The Power of Now.
“The present holds within itself the complete sum of existence, backwards and forwards, that whole amplitude of time, which is eternity.”
— Alfred North Whitehead, The Aims of Education (1929), p. 23

Quotes via Wikiquote (CC BY-SA), each with its original source.

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Notable quotes

“Captain James T. Kirk: But one man can change the present.”
— Star Trek: The Original Series episode Mirror, Mirror (6 October 1967) by Jerome Bixby
“There are those who regard this history of past strife and exile as better forgotten. But, to use the phrase of Yeats, let us not casually reduce "that great past to a trouble of fools." For we need not feel the bitterness of the past to discover its meaning for the present and the future.”
— John F. Kennedy, Speech to a joint session of the Dail and the Seanad, Dublin, Ireland (28 June 1963)
“In an era of stress and anxiety, when the present seems unstable and the future unlikely, the natural response is to retreat and withdraw from reality, taking recourse either in fantasies of the future or in modified visions of a half-imagined past.”
— Alan Moore, Watchmen
“We do, however, speak a message of wisdom among the mature, but not the wisdom of this age or of the rulers of this age, who are coming to nothing.”
— Paul of Tarsus, 1 Corinthians 2:6 NIV
“Whereas before you dwelt in time and paid brief visits to the Now, have your dwelling place in the Now and pay brief visits to past and future when required to deal with the practical aspects of your life situation.”
— Eckhart Tolle, The Power of Now.
“The present holds within itself the complete sum of existence, backwards and forwards, that whole amplitude of time, which is eternity.”
— Alfred North Whitehead, The Aims of Education (1929), p. 23

Quotes via Wikiquote (CC BY-SA), each with its original source.

In an amplifier, a presence control boosts the upper mid-range frequencies to make the sounds of voices and instruments with similar tonal ranges seem more "present".

Overview

In an amplifier, a presence control boosts the upper mid-range frequencies to make the sounds of voices and instruments with similar tonal ranges seem more "present". On television production studio's sound desk, there can be several presence controls, for several different, switchable, frequencies. There is a limit to the flexibility of such controls, and they are sometimes insufficient. If the degree of mis-match between microphones is great, simply increasing presence is not enough, and instead a sound engineer will use a graphic equalizer, sometimes several, each connected to an individual sound channel. Presence controls can also be found on electric guitar amplifiers. The first presence control on a Fender amplifier, for example, appeared in 1954 on the Twin. In 1955 it appeared on the 1/15 Pro-Amp, the 3/10 Bandmaster, the 2/10 Super, and the 4/10 Bassman. The original Fender presence control acted upon the amplifier's negative-feedback loop. As the level of "presence" was increased, so more and more of the higher frequencies in the negative-feedback loop were dumped to ground, leaving the low and mid-range frequencies. Increasing the presence resulted in there being less and less negative feedback on high frequencies. The effect varied according to amplitude. Later Fender amplifiers used a different presence control. The presence control on the 1975 Fender Super Twin did not modify the negative feedback loop, but was an active equalization circuit, controlling the 3.9 kHz frequency range. It had the ability to both amplify (boost) and attenuate (cut), unlike the earlier presence control.

From Wikipedia (CC BY-SA 4.0).

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