
In physics and electrical engineering, a cutoff frequency, corner frequency, or break frequency is a boundary in a system`s frequency response at which energy flowing through the system begins to be reduced (attenuated or reflected) rather than passing through. Typically in electronic systems such as filters and communication channels, cutoff fre....
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http://en.wikipedia.org/wiki/Cutoff_frequency

The point in the frequency spectrum beyond which a synthesizer's filter attenuates the audio signal being sent through it.
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http://www.encyclo.co.uk/local/22285

The frequency where the output of a filter, speaker etc is 3 Decibels per Volt lower than its maximum level. A loudspeakers / amplifiers / microphones frequency response is usually designated by this form of measurement. The frequency above or below which attenuation begins in a filter circuit.
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http://www.traditionalmusic.co.uk/music%20tech%20glossary/Music%20Tech%20Gl

AbsorptionThe cutoff frequency of an anechoic wedge or set of wedges is the lowest frequency above which the normal incidence sound absorption coefficient is at least .990Duct AcousticsPlane wave propagation will occur in ducts up until ka~1.84
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https://www.encyclo.co.uk/local/20687
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