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Søren Absalon Larsen (April 5, 1871 – January 2, 1957) was a Danish physicist who worked in the field of electroacoustics and is best known for giving his name to the Larsen effect. Absalon Larsen was originally MSc. Philosophy and taught theology, then he began to study physics. He subsequently joined to assist Professor Prytz in the organization of a new exercise course in electronics for mechanical engineers.
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"Block diagram of the signal-flow for a common feedback loop."Hodgson, Jay (2010). Understanding Records, p.118. . Audio feedback (also known as acoustic feedback, simply as feedback, or the Larsen effect) is a special kind of positive loop gain which occurs when a sound loop exists between an audio input (for example, a microphone or guitar pickup) and an audio output (for example, a power amplified loudspeaker).
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In the late 1950s, Guitarist Link Wray began intentionally overdriving his vacuum tube amplifiers to create a noisy and "dirty" sound for his solos after an accidental discovery. Wray also poked holes in his speaker cones with pencils to further distort the tone, used electro-mechanical echo chambers (then usually employed by singers), the recent powerful and "fat" Gibson humbucking pickups, and controlled "feedback" (Larsen effect). The resultant sound can be heard on his influential 1958 instrumental, "Rumble" and Rawhide. In 1961, Grady Martin scored a hit with a fuzzy tone accidentally caused by a faulty preamplifier that distorted his guitar playing on the Marty Robbins song "Don't Worry".
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Audio feedback (also known as acoustic feedback, simply as feedback, or the Larsen effect) is a special kind of positive feedback which occurs when a sound loop exists between an audio input (for example, a microphone or guitar pickup) and an audio output (for example, a loudly-amplified loudspeaker). In this example, a signal received by the microphone is amplified and passed out of the loudspeaker. The sound from the loudspeaker can then be received by the microphone again, amplified further, and then passed out through the loudspeaker again. The frequency of the resulting sound is determined by resonance frequencies in the microphone, amplifier, and loudspeaker, the acoustics of the room, the directional pick-up and emission patterns of the microphone and loudspeaker, and the distance between them.
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The principles of audio feedback were first discovered by Danish scientist Søren Absalon Larsen, hence the name "Larsen Effect". Feedback is almost always considered undesirable when it occurs with a singer's or public speaker's microphone at an event using a sound reinforcement system or PA system. Audio engineers typically use directional microphones with cardioid pickup patterns and various electronic devices, such as equalizers and, since the 1990s, automatic feedback detection devices, to prevent these unwanted squeals or screeching sounds, which detract from the audience's enjoyment of the event and may damage equipment. On the other hand, since the 1960s, electric guitar players in rock music bands using loud guitar amplifiers, speaker cabinets and distortion effects have intentionally created guitar feedback to create different sounds including long sustained tones that cannot be produced using standard playing techniques.
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