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Equalization (audio)

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equalization until the present day, as well as the theoretical underpinnings of the elegant circuit. Instead of slide potentiometers working on individual bands of frequency, or rotary switches, Flickinger's circuit allowed arbitrary selection of frequency and cut or boost level in three overlapping bands over the entire audio spectrum. Six knobs on his early EQs would control these sweepable filters. Up to six switches were incorporated to select shelving on the high and low bands, and bypassing for any unused band for the purest signal path.
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Instead it uses nine drivers all of the same four-inch diameter, more akin to what one would find in a table radio. However, this speaker system is sold with an active equalizer. That equalizer must be inserted into the amplifier system so that the amplified signal that is finally sent to the speakers has its response increased at the frequencies where the response of these drivers falls off, and vice versa, producing the response intended by the manufacturer.
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is possible to cut the gain only around that frequency while preserving the gain at most other frequencies. This can best be done using a parametric equalizer tuned to that very frequency with its amplitude control sharply reduced. By adjusting the equalizer for a narrow bandwidth (high Q), most other frequency components will not be affected. The extreme case when the signal at the filter's center frequency is completely eliminated is known as a
1309:. The bass and treble controls in a hi-fi system are each a first-order filter in which the balance of frequencies above and below a point are varied using a single knob. A special case of first-order filters is a first-order high-pass or low-pass filter in which the 6 dB per octave cut of low or high frequencies extends indefinitely. These are the simplest of all filters to implement individually, requiring only a capacitor and resistor. 40: 1195: 182: 1152: 1294: 411: 1318: 419: 3845: 3107: 367:
EQ was borne, more or less, out of an idea that Burgess and I had around 1966 or 1967 for an EQ… three controls adjusting, independently, the parameters for each of three bands for a recording console… I wrote and delivered the AES paper on Parametrics at the Los Angeles show in 1972… It’s the first mention of 'Parametric' associated with sweep-tunable EQ."
1911:. "Rumble" is a type of low-frequency noise produced in record players and turntables, particularly older or low quality models. The rumble filter prevents this noise from being amplified and sent to the loudspeakers. Some cassette decks have a switchable "subsonic filter" feature that does the same thing for recordings. 1747: 1333:; a higher Q corresponds to a sharper response (smaller bandwidth) around a particular center frequency. For instance, the red response in the accompanying image cuts frequencies around 100 Hz with a higher Q than the blue response which boosts frequencies around 1000 Hz. Higher Q's correspond to 1941:
Equalization is used in a reciprocal manner in certain communication channels and recording technologies. The original music is passed through a particular filter to alter its frequency balance, followed by the channel or recording process. At the end of the channel or when the recording is played, a
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A variant of the parametric equalizer is the semi-parametric equalizer, which is also known as a sweepable filter. It allows users to control the amplitude and frequency, but uses a pre-set bandwidth of the center frequency. In some cases, semi-parametric equalizers allow the user to select between a
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is set to zero, implements a first-order low-pass or high-pass filter, respectively. However, the usual tone controls have a more limited range, since their purpose is not to eliminate any frequencies but only to achieve a greater balance when, for instance, the treble is lacking and the sound is not
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adjustments. Graphic and parametric equalizers have much more flexibility in tailoring the frequency content of an audio signal. Broadcast and recording studios use sophisticated equalizers capable of much more detailed adjustments, such as eliminating unwanted sounds or making certain instruments or
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envisioned a tunable EQ for a new recording console. Bob Meushaw, a friend of Massenburg, built the equalizer. According to Massenburg, "Four people could possibly lay claim to the modern concept: Bob Meushaw, Burgess Macneal, Daniel Flickinger, and myself… Our (Bob’s, Burgess’ and my) sweep-tunable
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Model EQ-251A was the first equalizer to use slide controls. It featured two passive equalization sections, a bass shelving filter, and a pass band filter. Each filter had switchable frequencies and used a 15-position slide switch to adjust cut or boost. The first true graphic equalizer was the type
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in general. Audio electronic equipment evolved to incorporate filtering elements as consoles in radio stations began to be used for recording as much as broadcast. Early filters included basic bass and treble controls featuring fixed frequency centers, and fixed levels of cut or boost. These filters
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equipment for gross adjustment of the frequency balance. The bass control may be used, for instance, to increase the drum and bass parts at a dance party, or to reduce annoying bass sounds when listening to a person speaking. The treble control might be used to give the percussion a sharper or more
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for that microphone, perhaps sacrificing the contribution of a singer's voice, for instance. Even at a slightly reduced gain, the feedback will still cause an unpleasant resonant sound around the frequency at which it would howl. But because the feedback is troublesome at a particular frequency, it
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A first-order low-pass or high-pass filter has a standard response curve that reduces the unwanted frequencies well above or below the cutoff frequency with a slope of 6 dB per octave. A second-order filter will reduce those frequencies with a slope of 12 dB per octave and moreover may be
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introduced the first parametric equalizer in early 1971. His design leveraged a high-performance op-amp of his own design, the 535 series to achieve filtering circuits that were before impossible. Flickinger's patent from early in 1971 showed the circuit topology that would come to dominate audio
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An equalizer can be used to correct or modify the frequency response of a loudspeaker system rather than designing the speaker itself to have the desired response. For instance, the Bose 901 speaker system does not use separate larger and smaller drivers to cover the bass and treble frequencies.
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The range of second-order filter functions is important because any analog filter function can be decomposed into a (usually small) number of these (plus, perhaps, simpler first-order responses). These are implemented directly by each section of a parametric equalizer where they are explicitly
1567: 1144:. The amplitude passed by each filter is adjusted using a slide control to boost or cut frequency components passed by that filter. The vertical position of each slider thus indicates the gain applied to that frequency band, so that the knobs resemble a 153:. Equalization may also be used to eliminate or reduce unwanted sounds (e.g., low-frequency hum coming from a guitar amplifier), make certain instruments or voices more (or less) prominent, enhance particular aspects of an instrument's tone, or combat 217:; this was prior to the invention of electronic amplification. Initially, equalization was used to compensate for the uneven frequency response of an electric system by applying a filter having the opposite response, thus restoring the fidelity of the 1966:, a filter is used to reduce the amplitude of low frequencies which otherwise produce large amplitudes on the tracks of a record. Then the groove can take up less physical space, fitting more music on the record. The preamplifier attached to the 563:
of those frequencies. While the human ear is not as sensitive to the phase of audio frequencies, music professionals may favor certain equalizers because of how they affect the timbre of the musical content by way of audible phase artifacts.
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of a mix, creating the impression that some sounds in a mono or stereo mix are farther away or closer than others. Equalization is also commonly used to give tracks with similar frequency components complementary spectral contours, known as
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While high-pass and low-pass filters are useful for removing unwanted signal above or below a set frequency, shelving filters can be used to reduce or increase signals above or below a set frequency. Shelving filters are used as common
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from the 1950s through to the 1970s. Later on, as other manufacturers started to market their products, these British companies began touting their equalizers as being a cut above the rest. Today, many non-British companies such as
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made from 1971 to the present day rely upon the designs of Flickinger, Massenburg and McNeal in either semi or fully-parametric topology. In the late 1990s and in the 2000s, parametric equalizers became increasingly available as
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equalizer might have one set of controls applying the same gain to both stereo channels for convenience, with a total of five to ten frequency bands. On the other hand, an equalizer for professional
1880:. When the sound produced by the speakers is picked up by a microphone, it is further reamplified; this recirculation of sound can lead to "howling", requiring the sound technician to reduce the 236:. Sound engineers correct the frequency response of a sound system so that the frequency balance of the music as heard through speakers better matches the original performance picked up by a 1830:. Selected components of parts that would otherwise compete, such as bass guitar and kick drum, are boosted in one part and cut in the other, and vice versa, so that they both stand out. 1225:") can be widened or narrowed. Parametric equalizers are capable of making much more precise adjustments to the sound than other equalizers, and are commonly used in sound recording and 1954:
that is introduced by the radio is then also de-emphasized at the higher frequencies (where it is most noticeable) along with the pre-emphasized program, making the noise less audible.
1442: 47:. For the left and right bands of the sound content, there are a series of vertical faders, which can be used to boost or cut specific frequency ranges. This equalizer is set to a 1186:
apart, three filters to an octave. Equalizers with half as many filters per octave are common where less precise control is required—this design is called a 2/3-octave equalizer.
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A parametric equalizer has one or more sections each of which implements a second-order filter function. This involves three adjustments: selection of the center frequency (in
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crisp. Since the range of possible responses from shelving filters is so limited, some audio engineers considered shelving controls inadequate for equalization tasks. On some
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The number of frequency channels (and therefore each one's bandwidth) affects the cost of production and may be matched to the requirements of the intended application. A
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generator. Then a graphic equalizer can be easily adjusted to compensate for the room's acoustics. Such compensation can also be applied to tweak the sound quality of a
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volume levels for the different frequencies. For example, equalization is used to modify an instrument's sound or make certain instruments and sounds more prominent. A
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A first-order filter can alter the response of frequencies above and below a point. In the transition region the filter response will have a slope of up to 6 
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passes low-frequency components of signals while attenuating higher frequencies. In audio applications these high-pass and low-pass filters are frequently termed
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A graphic equalizer also implements second-order filter functions in a more user-friendly manner but with somewhat less flexibility. This equipment is based on a
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complementary filter is inserted which precisely compensates for the original filter and recovers the original waveform. For instance, FM broadcasting uses a
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filter section only reduces (rather than eliminates) very high frequencies, but has a steep response falling to zero at a specific frequency (the so-called
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of individual instruments and voices by adjusting their frequency content and to fit individual instruments within the overall frequency spectrum of the
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Shelving controls are usually simple first-order filter functions that alter the relative gains between frequencies much higher and much lower than the
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energy from a program that may consume undue amplifier power and cause excessive diaphragm excursions in (or even damage to) loudspeakers. A
2471: 678: 2136: 1221:. The amplitude of each band can be controlled, and the center frequency can be shifted, and the bandwidth (which is inversely related to " 2359: 1907:
A "rumble filter" is a high-pass (low cut) filter with a cutoff typically in the 20 to 40 Hz range; this is the low frequency end of
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advertise British EQ on their equipment. A British style EQ seeks to replicate the qualities of the expensive British mixing consoles.
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in the context of audio reproduction is not used strictly to compensate for the deficiency of equipment and transmission channels. A
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is now broadly used to describe the application of such filters regardless of intent. This broad definition, therefore, includes all
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of less than 1/2 can be decomposed into two first-order filter functions, a low-cut and a high-cut (or boost). Of more interest are
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Model 9062A EQ. In 1967 Davis developed the first 1/3 octave variable notch filter set, the Altec-Lansing "Acousta-Voice" system.
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equipment, is adjusted to affect the gain of lower frequencies while having no effect well above its cutoff frequency. A
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filter functions which can boost (or cut) a narrow range of frequencies. In addition to specifying the center frequency
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may use an equalizer to make some high-pitches in a vocal part louder while making low-pitches in a drum part quieter.
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response fails, however, at 71 Hz where the original system had a null in its response which cannot be corrected.
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In this case, the inclusion of the leading factor simply indicates that the response at frequencies much higher than
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In addition to adjusting the relative amplitude of frequency bands, an audio equalizer usually alters the relative
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have long had filters or controls to modify their frequency response. These are most often in the form of variable
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voices more prominent. Because of this ability, they can be aptly described as "frequency-specific volume knobs."
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ASP8024 Mixing console. The upper section has high and low shelving EQ, the lower section has fully parametric EQ.
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systems, equalization is not only used to "flatten" the frequency response but may also be useful in eliminating
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of a 3-way system). This is most often built into the speaker enclosure and hidden from the user. However, in
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A doubling of signal voltage and a consequent quadrupling of signal power for every doubling of frequency.
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responses (implemented as so-called biquad sections). These can be described according to their so-called
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functions. Blue: a 9 dB boost at 1 kHz. Red: a 6 dB cut at 100 Hz having a higher
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to modify frequency responses for aesthetic reasons. Hence in the field of audio electronics the term
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typically has some 25 to 31 bands, for more precise control of feedback problems and equalization of
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Two first-order shelving filters: a −3 dB bass cut (red), and a +9 dB treble boost (blue).
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era, many stereos would include a switch to introduce a high-pass (low cut) filter, often called a
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are called the pole and zero frequencies, respectively. Turning down the treble control increases
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worked over broad frequency ranges. Variable equalization in audio reproduction was first used by
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filter to boost the high frequencies before transmission, and every receiver includes a matching
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only modifies the audio signal by removing high frequencies. An example of this is a high-cut or
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capable of reproducing it. For instance, a low-pass filter is used in the signal chain before a
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versions of DSP parametric equalizers were also quickly introduced after the software versions.
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in the 1920s. That system was used to equalize a motion picture theater sound playback system.
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are multi-band variable equalizers that allow users to control the three primary parameters:
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controls, and switches to apply low-cut or high-cut filters for elimination of low-frequency
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Playback equalization for 78rpm shellacs and early LPs (EQ curves, index of record labels):
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modifies a signal by eliminating only lower frequencies. An example of this is a low-cut or
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while helping to cut even higher frequency subcarrier components remaining from the stereo
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This article is about frequency-dependent processing of audio signals. For other uses, see
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A first order low-pass (high-cut) filter implemented using only a resistor and capacitor.
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Two first-order shelving filters: a −3dB bass cut (red), and a +9dB treble boost (blue).
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has a complementary filter boosting those low frequencies, following the standard
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is a system of filters designed to direct electrical energy separately to the
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EQ") because the center frequencies of its filters are spaced one third of an
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is the process of adjusting the volume of different frequency bands within an
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and other equipment developed for improving fidelity have since been used by
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During live events where signals from microphones are amplified and sent to
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Although the range of equalization functions is governed by the theory of
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played through imperfect speakers and modified by room acoustics (top) is
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determines how much that frequency band will be boosted (or cut). Thus a
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H. Tremaine, Audio Cyclopedia, 2nd. Ed., (H.W. Sams, Indianapolis, 1973)
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equalizer, the user is given limited switchable options for bandwidth.
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to adjust the frequency response in recording, reproduction, and live
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includes one such element whose Q is not adjustable by the user.
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is a filter, an electronic circuit or device, that passes higher
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It is also possible to define the Q of a band-pass function as:
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The concept of equalization was first applied in correcting the
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to ensure that only deep bass frequencies reach the subwoofer.
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Changing the balance of frequency components in an audio signal
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adjusted. And each element of a graphic equalizer based on a
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are boosted. Setting the treble control at the center sets
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is the bandwidth expressed in the same frequency unit that
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behaviour in which the half-power or −3 dB bandwidth,
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section will have three controls for its center frequency
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is set to infinity, or a low shelving response in which
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are attenuated. Turning up the treble control increases
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equalizer the bandwidth is preset by the designer. In a
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in order to effect an even steeper response around the
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is the bandwidth in octaves. The reverse mapping is:
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is unity and that only bass frequencies are affected.
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of the equalizer's response plotted versus frequency.
907: 681: 1229:. Parametric equalizers are also sold as standalone 2063: 1158:graphic and parametric EQs; the device on top is a 620:frequencies. High and low-pass filters are used in 385:in a paper presented at the 42nd convention of the 318:Filtering audio frequencies dates back at least to 51:, in which the mid-range sound frequencies are cut. 2626: 2606: 1833:Equalizers can correct problems posed by a room's 1741: 1561: 1386: 1066: 798: 2354: 2324: 567: 3861: 2038: 2036: 2034: 59:Equalizers are also made in compact pedal-style 2502: 2163:"Extraordinary EQ from Extraordinary Engineers" 2139:. Sweetwater. December 20, 1999. Archived from 2083:. University of Washington Press. p. 140. 1257:are mathematically described in terms of their 2418:Preis, Douglas; Bloom, P. J. (November 1984), 1817:Equalization is commonly used to increase the 377:Similar designs appeared soon thereafter from 3137: 2674: 2224:"Operator Adjustable Equalizers: An Overview" 2031: 1767:and the Q, the specification of the filter's 2506:The Theory and Technique of Electronic Music 2110: 3764:Professional Lighting and Sound Association 2221: 289:is one with similar properties to those on 278:at the disposal of a listener or engineer. 195:sophisticated filter using digital hardware 3354:Comparison of analog and digital recording 3144: 3130: 2681: 2667: 2417: 2076: 978: 293:made in the UK by companies such as Amek, 3088:Music technology (electronic and digital) 2217: 2215: 2106: 2104: 2102: 2100: 2424:Journal of the Audio Engineering Society 2190:The Telephone and the Multiple Telegraph 1316: 1292: 1244: 1193: 1150: 1136:, the input signal is sent to a bank of 487:covering the audio spectrum in up to 31 417: 409: 180: 54: 38: 2559:Glen Ballou, "Filters and equalizers", 2129: 1312: 1285:in the case of second-order responses. 1189: 137:, to correct or adjust the response of 14: 3862: 2252: 2212: 2155: 2097: 2042: 2013: 2011: 2009: 1408:frequency of the second-order filter. 1288: 468:which determines the sharpness of the 263: 44: 3825:New Interfaces for Musical Expression 3125: 2662: 2654:WikiRecording's Guide to Equalization 2503:Miller Puckette (December 30, 2006). 3151: 2688: 2589:Discriminating EQ frequencies by ear 2563:, Fourth edition, Focal Press, 2008 2344:from the original on April 18, 2024. 1752:A second-order filter response with 1325:Second-order filters are capable of 1237:wide and a narrow preset bandwidth. 1120: 499:of the intended frequency response. 161:system. Equalizers are also used in 2006: 1240: 529:designed with a higher Q or finite 449:, such as the bass control on most 24: 2552: 2077:Louie, Gary; White, Glenn (2005). 1958:used the same approach to reduce " 1849:of a room may be analyzed using a 1419:is. Low Q filter responses (where 1124: 635: 25: 3901: 3374:Reel-to-reel audio tape recording 2929:Recording studio as an instrument 2649:PreSonus Equalizer Terms and Tips 2594:Calculator: bandwidth per octave 2576: 1094:A high shelving control in which 228:Later the concept was applied in 101:equipment uses relatively simple 3843: 3105: 2046:PC Recording Studios for Dummies 858:so that frequencies higher than 837:so that frequencies higher than 664:will have a frequency response | 84:sound recording and reproduction 3359:Experimental musical instrument 2532: 2523: 2496: 2464: 2434: 2411: 2386: 2318: 2300: 2282: 2268: 1861:in addition to its use in live 1198:The equalizer-section from the 537:. For instance, a second-order 405: 389:. Most channel equalization on 2348:AES E-Library description page 2246: 2203: 2181: 1701: 1695: 1536: 1530: 1387:{\displaystyle BW\ =\ F_{0}/Q} 1321:Second-order filter responses. 1049: 1027: 1010: 988: 969: 940: 927: 922: 916: 909: 784: 762: 745: 723: 701: 696: 690: 683: 584:lower-frequency components. A 568:High-pass and low-pass filters 176: 13: 1: 3544:Electronic musical instrument 2115:. Bloomsbury Publishing USA. 672:)| whose square is given by: 362:In 1966, Burgess Macneal and 32:Equalization (disambiguation) 3850:Record production portal 3739:Institute of Broadcast Sound 3112:Record production portal 2561:Handbook for Sound Engineers 2255:"Langevin EQ-251A Schematic" 2024: 890:Similarly the response of a 185:The very uneven spectrum of 7: 3759:Musical Electronics Library 3083:Music technology (electric) 2543:Bose 901 Loudspeaker Review 2480:. July 2001. Archived from 2222:Dennis Bohn (August 1997). 1977: 1863:sound reinforcement systems 234:sound reinforcement systems 119:recording and radio studios 10: 3906: 3506:Sound reinforcement system 3415:Sound reinforcement system 2394:"What is a Parametric EQ?" 1950:filter to restore it. The 513:, which is used to remove 313: 29: 3839: 3787: 3729:Audio Engineering Society 3721: 3645: 3627:Software effect processor 3607:Digital audio workstation 3592: 3514: 3456: 3448:Digital signal processing 3433: 3387: 3329: 3271: 3212:Digital audio workstation 3187: 3159: 3101: 3050: 2957: 2896: 2786: 2696: 2360:"Parametric Equalization" 396:digital signal processing 387:Audio Engineering Society 3820:Professional audio store 3722:People and organizations 3708:Sound recording engineer 2165:. Mackie. Archived from 1999: 1930:system (and also to the 1227:live sound reinforcement 1172:live sound reinforcement 624:to direct energy to the 197:(bottom). The resulting 123:production control rooms 3238:Microphone preamplifier 2337:. 42nd AES Convention. 2331:Parametric Equalization 1797: 1281:frequencies, which are 1261:or, in layman's terms, 898:can be represented as: 383:parametric equalization 287:British style equalizer 117:Equalizers are used in 3179:Electronic and digital 2628: 2608: 2472:"Equalisers Explained" 1743: 1563: 1388: 1322: 1298: 1250: 1203: 1163: 1129: 1068: 800: 431: 415: 202: 72: 52: 3000:Ghostwriters in music 2639:EQ Condensed Overview 2629: 2609: 2113:Understanding Records 2111:Hodgson, Jay (2010). 2049:. Wiley. p. 25. 2043:Strong, Jeff (2005). 1989:Loudness compensation 1826:mirrored equalization 1744: 1564: 1389: 1320: 1296: 1248: 1207:Parametric equalizers 1197: 1154: 1128: 1069: 801: 464:), adjustment of the 430:(narrower bandwidth). 421: 413: 184: 131:instrument amplifiers 58: 42: 3637:Software synthesizer 3602:Digital audio editor 3388:Playback transducers 3248:Multitrack recording 2618: 2598: 2509:. World Scientific. 2278:. February 22, 2016. 2080:The Audio Dictionary 1845:. For instance, the 1773:parametric equalizer 1583: 1443: 1348: 1313:Second-order filters 1190:Parametric equalizer 905: 679: 606:high-frequency noise 547:FM stereo subcarrier 371:Daniel N. Flickinger 69:parametric equalizer 18:Parametric equalizer 3890:Tone, EQ and filter 2529:Ballou, pp.875-876. 2484:on December 3, 2013 2444:Electronic Musician 2169:on December 2, 2013 1289:First-order filters 320:acoustic telegraphy 268:recording engineers 256:and high-frequency 127:sound reinforcement 65:electric guitarists 3688:Re-recording mixer 3491:Keyboard amplifier 3207:Binaural recording 2914:Hip hop production 2624: 2614:to quality factor 2604: 2442:"Linear Phase EQ, 2143:on August 20, 2012 1847:frequency response 1843:acoustic dampening 1812:recording engineer 1739: 1559: 1384: 1323: 1299: 1263:frequency response 1251: 1204: 1164: 1130: 1064: 796: 600:or described as a 443:cutoff frequencies 432: 416: 349:Cinema Engineering 343:7080 developed by 264:Graphic equalizers 207:frequency response 203: 143:instrument pickups 73: 67:. This pedal is a 53: 3857: 3856: 3663:Guitar technician 3559:Music workstation 3443:Digital recording 3420:Speaker enclosure 3339:8-track cartridge 3281:Phonograph record 3119: 3118: 2721:Critical distance 2644:Audio EQ Cookbook 2627:{\displaystyle Q} 2607:{\displaystyle N} 2356:George Massenburg 2326:George Massenburg 2122:978-1-4411-5607-5 1984:Electronic filter 1972:RIAA equalization 1932:mid-range speaker 1916:crossover network 1851:spectrum analyzer 1730: 1705: 1682: 1676: 1667: 1659: 1632: 1597: 1591: 1554: 1543: 1500: 1494: 1490: 1471: 1457: 1451: 1365: 1359: 1259:transfer function 1253:The responses of 1160:Power conditioner 1134:graphic equalizer 1121:Graphic equalizer 1059: 794: 647:guitar amplifiers 379:George Massenburg 364:George Massenburg 230:audio engineering 135:guitar amplifiers 49:smiley face curve 45:graphic equalizer 16:(Redirected from 3897: 3848: 3847: 3846: 3734:Goji Electronics 3673:Monitor engineer 3632:Software sampler 3539:Electronic drums 3516:Electronic music 3486:Guitar amplifier 3331:Analog recording 3291:Compact cassette 3253:Music production 3161:Music technology 3153:Music technology 3146: 3139: 3132: 3123: 3122: 3110: 3109: 3108: 3025:Session musician 2690:Music production 2683: 2676: 2669: 2660: 2659: 2633: 2631: 2630: 2625: 2613: 2611: 2610: 2605: 2546: 2536: 2530: 2527: 2521: 2520: 2500: 2494: 2493: 2491: 2489: 2468: 2462: 2461: 2459: 2457: 2452:on July 16, 2015 2448:. Archived from 2438: 2432: 2431: 2415: 2409: 2408: 2406: 2404: 2390: 2384: 2381: 2379: 2377: 2372:on July 14, 2011 2371: 2365:. Archived from 2364: 2345: 2343: 2336: 2322: 2316: 2315: 2314: 2310: 2304: 2298: 2297: 2296: 2292: 2286: 2280: 2279: 2272: 2266: 2265: 2263: 2261: 2250: 2244: 2243: 2241: 2239: 2234:on April 2, 2014 2230:. Archived from 2228:Rane Corporation 2219: 2210: 2207: 2201: 2200: 2199: 2197: 2185: 2179: 2178: 2176: 2174: 2159: 2153: 2152: 2150: 2148: 2133: 2127: 2126: 2108: 2095: 2094: 2074: 2061: 2060: 2040: 2018: 2015: 1994:Weighting filter 1936:bi-amplification 1859:recording studio 1828: 1827: 1748: 1746: 1745: 1740: 1735: 1731: 1729: 1718: 1706: 1704: 1684: 1680: 1674: 1673: 1669: 1668: 1660: 1658: 1657: 1656: 1640: 1638: 1633: 1631: 1620: 1610: 1609: 1595: 1589: 1568: 1566: 1565: 1560: 1555: 1553: 1552: 1548: 1544: 1539: 1522: 1502: 1498: 1492: 1491: 1489: 1482: 1481: 1470: 1469: 1460: 1459: 1455: 1449: 1432: 1431: 1427: 1393: 1391: 1390: 1385: 1380: 1375: 1374: 1363: 1357: 1241:Filter functions 1215:center frequency 1073: 1071: 1070: 1065: 1060: 1058: 1057: 1056: 1047: 1046: 1037: 1019: 1018: 1017: 1008: 1007: 998: 980: 977: 976: 967: 966: 957: 952: 951: 936: 935: 930: 912: 805: 803: 802: 797: 795: 793: 792: 791: 782: 781: 772: 754: 753: 752: 743: 742: 733: 715: 710: 709: 704: 686: 622:audio crossovers 574:high-pass filter 535:cutoff frequency 507:high-pass filter 478:quasi-parametric 242:Audio amplifiers 163:music production 21: 3905: 3904: 3900: 3899: 3898: 3896: 3895: 3894: 3885:Sound recording 3860: 3859: 3858: 3853: 3844: 3842: 3835: 3783: 3717: 3683:Record producer 3668:Mixing engineer 3641: 3588: 3554:MIDI controller 3529:Circuit bending 3510: 3452: 3429: 3405:Monitor speaker 3383: 3325: 3273:Recording media 3267: 3258:Music sequencer 3243:Monitor speaker 3189:Sound recording 3183: 3155: 3150: 3120: 3115: 3106: 3104: 3097: 3046: 3015:Record producer 2968: 2964: 2953: 2907: 2903: 2892: 2833:Double tracking 2789: 2782: 2773:Sound recording 2711:Audio mastering 2692: 2687: 2619: 2616: 2615: 2599: 2596: 2595: 2579: 2574: 2555: 2553:General sources 2550: 2549: 2537: 2533: 2528: 2524: 2517: 2501: 2497: 2487: 2485: 2470: 2469: 2465: 2455: 2453: 2440: 2439: 2435: 2416: 2412: 2402: 2400: 2392: 2391: 2387: 2375: 2373: 2369: 2362: 2353:Author's copy: 2341: 2334: 2323: 2319: 2312: 2306: 2305: 2301: 2294: 2288: 2287: 2283: 2274: 2273: 2269: 2259: 2257: 2251: 2247: 2237: 2235: 2220: 2213: 2208: 2204: 2195: 2193: 2187: 2186: 2182: 2172: 2170: 2161: 2160: 2156: 2146: 2144: 2135: 2134: 2130: 2123: 2109: 2098: 2091: 2075: 2064: 2057: 2041: 2032: 2027: 2022: 2021: 2016: 2007: 2002: 1980: 1968:phono cartridge 1825: 1824: 1804:sound recording 1800: 1781: 1766: 1722: 1717: 1713: 1688: 1683: 1652: 1648: 1644: 1639: 1637: 1624: 1619: 1618: 1614: 1605: 1601: 1584: 1581: 1580: 1523: 1521: 1520: 1516: 1506: 1501: 1477: 1473: 1472: 1465: 1461: 1458: 1444: 1441: 1440: 1429: 1425: 1424: 1418: 1403: 1376: 1370: 1366: 1349: 1346: 1345: 1341:, is given by: 1315: 1291: 1283:complex numbers 1243: 1192: 1123: 1106: 1099: 1089: 1082: 1052: 1048: 1042: 1038: 1033: 1020: 1013: 1009: 1003: 999: 994: 981: 979: 972: 968: 962: 958: 953: 947: 943: 931: 926: 925: 908: 906: 903: 902: 877: 870: 863: 856: 849: 842: 835: 828: 821: 814: 787: 783: 777: 773: 768: 755: 748: 744: 738: 734: 729: 716: 714: 705: 700: 699: 682: 680: 677: 676: 651:bass amplifiers 638: 636:Shelving filter 626:speaker drivers 616:, to eliminate 586:low-pass filter 570: 543:notch frequency 519:low-pass filter 489:frequency bands 485:bank of filters 474:semi-parametric 408: 391:mixing consoles 316: 291:mixing consoles 215:passive filters 211:telephone lines 179: 157:(howling) in a 35: 28: 23: 22: 15: 12: 11: 5: 3903: 3893: 3892: 3887: 3882: 3880:Linear filters 3877: 3872: 3855: 3854: 3840: 3837: 3836: 3834: 3833: 3828: 3822: 3817: 3812: 3807: 3802: 3797: 3791: 3789: 3788:Related topics 3785: 3784: 3782: 3781: 3776: 3771: 3766: 3761: 3756: 3751: 3746: 3744:Lejaren Hiller 3741: 3736: 3731: 3725: 3723: 3719: 3718: 3716: 3715: 3710: 3705: 3703:Sound operator 3700: 3698:Sound follower 3695: 3693:Sound designer 3690: 3685: 3680: 3675: 3670: 3665: 3660: 3655: 3653:Audio engineer 3649: 3647: 3643: 3642: 3640: 3639: 3634: 3629: 3624: 3619: 3614: 3609: 3604: 3598: 3596: 3590: 3589: 3587: 3586: 3581: 3576: 3571: 3566: 3561: 3556: 3551: 3546: 3541: 3536: 3531: 3526: 3520: 3518: 3512: 3511: 3509: 3508: 3503: 3498: 3493: 3488: 3483: 3478: 3473: 3471:Bass amplifier 3468: 3466:Mixing console 3462: 3460: 3454: 3453: 3451: 3450: 3445: 3439: 3437: 3431: 3430: 3428: 3427: 3422: 3417: 3412: 3407: 3402: 3397: 3391: 3389: 3385: 3384: 3382: 3381: 3376: 3371: 3366: 3361: 3356: 3351: 3346: 3341: 3335: 3333: 3327: 3326: 3324: 3323: 3318: 3313: 3308: 3303: 3298: 3293: 3288: 3283: 3277: 3275: 3269: 3268: 3266: 3265: 3260: 3255: 3250: 3245: 3240: 3235: 3230: 3225: 3220: 3215: 3209: 3204: 3202:Mixing console 3199: 3193: 3191: 3185: 3184: 3182: 3181: 3176: 3171: 3165: 3163: 3157: 3156: 3149: 3148: 3141: 3134: 3126: 3117: 3116: 3102: 3099: 3098: 3096: 3095: 3090: 3085: 3080: 3075: 3070: 3065: 3060: 3054: 3052: 3048: 3047: 3045: 3044: 3039: 3038: 3037: 3027: 3022: 3020:Rhythm section 3017: 3012: 3007: 3002: 2997: 2992: 2987: 2982: 2980:Audio engineer 2977: 2971: 2969: 2967: 2966: 2962: 2958: 2955: 2954: 2952: 2951: 2946: 2941: 2936: 2931: 2926: 2924:Overproduction 2921: 2916: 2910: 2908: 2906: 2905: 2901: 2897: 2894: 2893: 2891: 2890: 2885: 2880: 2875: 2870: 2865: 2860: 2855: 2853:Exciter effect 2850: 2845: 2840: 2830: 2825: 2815: 2810: 2805: 2800: 2794: 2792: 2784: 2783: 2781: 2780: 2775: 2770: 2765: 2760: 2755: 2750: 2745: 2744: 2743: 2738: 2728: 2723: 2718: 2713: 2708: 2702: 2700: 2694: 2693: 2686: 2685: 2678: 2671: 2663: 2657: 2656: 2651: 2646: 2641: 2636: 2623: 2603: 2591: 2586: 2578: 2577:External links 2575: 2573: 2572: 2556: 2554: 2551: 2548: 2547: 2531: 2522: 2515: 2495: 2477:Sound on Sound 2463: 2433: 2410: 2385: 2383: 2382: 2317: 2299: 2281: 2267: 2245: 2211: 2202: 2180: 2154: 2128: 2121: 2096: 2089: 2062: 2055: 2029: 2028: 2026: 2023: 2020: 2019: 2004: 2003: 2001: 1998: 1997: 1996: 1991: 1986: 1979: 1976: 1956:Tape recorders 1865:and even home 1839:standing waves 1799: 1796: 1779: 1764: 1750: 1749: 1738: 1734: 1728: 1725: 1721: 1716: 1712: 1709: 1703: 1700: 1697: 1694: 1691: 1687: 1679: 1672: 1666: 1663: 1655: 1651: 1647: 1643: 1636: 1630: 1627: 1623: 1617: 1613: 1608: 1604: 1600: 1594: 1588: 1570: 1569: 1558: 1551: 1547: 1542: 1538: 1535: 1532: 1529: 1526: 1519: 1515: 1512: 1509: 1505: 1497: 1488: 1485: 1480: 1476: 1468: 1464: 1454: 1448: 1416: 1401: 1395: 1394: 1383: 1379: 1373: 1369: 1362: 1356: 1353: 1314: 1311: 1290: 1287: 1269:responses and 1255:linear filters 1242: 1239: 1191: 1188: 1122: 1119: 1104: 1097: 1087: 1080: 1075: 1074: 1063: 1055: 1051: 1045: 1041: 1036: 1032: 1029: 1026: 1023: 1016: 1012: 1006: 1002: 997: 993: 990: 987: 984: 975: 971: 965: 961: 956: 950: 946: 942: 939: 934: 929: 924: 921: 918: 915: 911: 875: 868: 861: 854: 851:and decreases 847: 840: 833: 830:and decreases 826: 819: 812: 807: 806: 790: 786: 780: 776: 771: 767: 764: 761: 758: 751: 747: 741: 737: 732: 728: 725: 722: 719: 713: 708: 703: 698: 695: 692: 689: 685: 662:treble control 637: 634: 569: 566: 539:low-pass notch 436:linear filters 407: 404: 315: 312: 276:linear filters 260:respectively. 178: 175: 165:to adjust the 159:public address 151:hall acoustics 26: 9: 6: 4: 3: 2: 3902: 3891: 3888: 3886: 3883: 3881: 3878: 3876: 3875:Effects units 3873: 3871: 3870:Audio effects 3868: 3867: 3865: 3852: 3851: 3838: 3832: 3831:Vehicle audio 3829: 3826: 3823: 3821: 3818: 3816: 3813: 3811: 3808: 3806: 3803: 3801: 3800:High fidelity 3798: 3796: 3793: 3792: 3790: 3786: 3780: 3777: 3775: 3772: 3770: 3767: 3765: 3762: 3760: 3757: 3755: 3752: 3750: 3747: 3745: 3742: 3740: 3737: 3735: 3732: 3730: 3727: 3726: 3724: 3720: 3714: 3711: 3709: 3706: 3704: 3701: 3699: 3696: 3694: 3691: 3689: 3686: 3684: 3681: 3679: 3676: 3674: 3671: 3669: 3666: 3664: 3661: 3659: 3656: 3654: 3651: 3650: 3648: 3644: 3638: 3635: 3633: 3630: 3628: 3625: 3623: 3620: 3618: 3615: 3613: 3610: 3608: 3605: 3603: 3600: 3599: 3597: 3595: 3591: 3585: 3582: 3580: 3577: 3575: 3572: 3570: 3567: 3565: 3562: 3560: 3557: 3555: 3552: 3550: 3547: 3545: 3542: 3540: 3537: 3535: 3532: 3530: 3527: 3525: 3522: 3521: 3519: 3517: 3513: 3507: 3504: 3502: 3499: 3497: 3494: 3492: 3489: 3487: 3484: 3482: 3479: 3477: 3474: 3472: 3469: 3467: 3464: 3463: 3461: 3459: 3455: 3449: 3446: 3444: 3441: 3440: 3438: 3436: 3435:Digital audio 3432: 3426: 3423: 3421: 3418: 3416: 3413: 3411: 3408: 3406: 3403: 3401: 3398: 3396: 3393: 3392: 3390: 3386: 3380: 3379:Tape recorder 3377: 3375: 3372: 3370: 3367: 3365: 3362: 3360: 3357: 3355: 3352: 3350: 3349:Cassette deck 3347: 3345: 3342: 3340: 3337: 3336: 3334: 3332: 3328: 3322: 3319: 3317: 3314: 3312: 3309: 3307: 3304: 3302: 3299: 3297: 3294: 3292: 3289: 3287: 3286:Magnetic tape 3284: 3282: 3279: 3278: 3276: 3274: 3270: 3264: 3263:Outboard gear 3261: 3259: 3256: 3254: 3251: 3249: 3246: 3244: 3241: 3239: 3236: 3234: 3231: 3229: 3226: 3224: 3221: 3219: 3216: 3213: 3210: 3208: 3205: 3203: 3200: 3198: 3197:Audio channel 3195: 3194: 3192: 3190: 3186: 3180: 3177: 3175: 3172: 3170: 3167: 3166: 3164: 3162: 3158: 3154: 3147: 3142: 3140: 3135: 3133: 3128: 3127: 3124: 3114: 3113: 3100: 3094: 3091: 3089: 3086: 3084: 3081: 3079: 3076: 3074: 3071: 3069: 3066: 3064: 3063:Interpolation 3061: 3059: 3056: 3055: 3053: 3049: 3043: 3040: 3036: 3033: 3032: 3031: 3030:Backup singer 3028: 3026: 3023: 3021: 3018: 3016: 3013: 3011: 3008: 3006: 3003: 3001: 2998: 2996: 2993: 2991: 2988: 2986: 2983: 2981: 2978: 2976: 2973: 2972: 2970: 2963: 2960: 2959: 2956: 2950: 2947: 2945: 2944:Wall of Sound 2942: 2940: 2937: 2935: 2932: 2930: 2927: 2925: 2922: 2920: 2917: 2915: 2912: 2911: 2909: 2902: 2899: 2898: 2895: 2889: 2886: 2884: 2881: 2879: 2876: 2874: 2871: 2869: 2866: 2864: 2863:Octave effect 2861: 2859: 2856: 2854: 2851: 2849: 2846: 2844: 2841: 2838: 2834: 2831: 2829: 2826: 2823: 2819: 2816: 2814: 2811: 2809: 2808:Chorus effect 2806: 2804: 2801: 2799: 2796: 2795: 2793: 2791: 2785: 2779: 2776: 2774: 2771: 2769: 2766: 2764: 2761: 2759: 2756: 2754: 2751: 2749: 2746: 2742: 2741:Wah-wah pedal 2739: 2737: 2734: 2733: 2732: 2729: 2727: 2724: 2722: 2719: 2717: 2714: 2712: 2709: 2707: 2704: 2703: 2701: 2699: 2695: 2691: 2684: 2679: 2677: 2672: 2670: 2665: 2664: 2661: 2655: 2652: 2650: 2647: 2645: 2642: 2640: 2637: 2635: 2621: 2601: 2592: 2590: 2587: 2585: 2584:Audacity Wiki 2581: 2580: 2570: 2569:0-240-80969-6 2566: 2562: 2558: 2557: 2544: 2540: 2535: 2526: 2518: 2516:9789812700773 2512: 2508: 2507: 2499: 2483: 2479: 2478: 2473: 2467: 2451: 2447: 2445: 2437: 2430:(11): 842–848 2429: 2425: 2421: 2414: 2399: 2395: 2389: 2368: 2361: 2357: 2352: 2351: 2349: 2340: 2333: 2332: 2327: 2321: 2309: 2303: 2291: 2285: 2277: 2271: 2256: 2249: 2233: 2229: 2225: 2218: 2216: 2206: 2192: 2191: 2184: 2168: 2164: 2158: 2142: 2138: 2132: 2124: 2118: 2114: 2107: 2105: 2103: 2101: 2092: 2090:9780295984988 2086: 2082: 2081: 2073: 2071: 2069: 2067: 2058: 2056:9780764577079 2052: 2048: 2047: 2039: 2037: 2035: 2030: 2014: 2012: 2010: 2005: 1995: 1992: 1990: 1987: 1985: 1982: 1981: 1975: 1973: 1969: 1965: 1964:vinyl records 1961: 1957: 1953: 1949: 1945: 1939: 1937: 1933: 1929: 1928:2-way speaker 1925: 1921: 1917: 1912: 1910: 1909:human hearing 1905: 1902: 1898: 1897:Tone controls 1894: 1890: 1888: 1883: 1879: 1875: 1870: 1868: 1864: 1860: 1856: 1852: 1848: 1844: 1840: 1836: 1831: 1829: 1820: 1815: 1813: 1809: 1805: 1795: 1793: 1787: 1785: 1778: 1774: 1770: 1763: 1759: 1755: 1736: 1732: 1726: 1723: 1719: 1714: 1710: 1707: 1698: 1692: 1689: 1685: 1677: 1670: 1664: 1661: 1653: 1649: 1645: 1641: 1634: 1628: 1625: 1621: 1615: 1611: 1606: 1602: 1598: 1592: 1586: 1579: 1578: 1577: 1575: 1556: 1549: 1545: 1540: 1533: 1527: 1524: 1517: 1513: 1510: 1507: 1503: 1495: 1486: 1483: 1478: 1474: 1466: 1462: 1452: 1446: 1439: 1438: 1437: 1434: 1422: 1415: 1411: 1407: 1400: 1381: 1377: 1371: 1367: 1360: 1354: 1351: 1344: 1343: 1342: 1340: 1336: 1332: 1328: 1319: 1310: 1308: 1304: 1295: 1286: 1284: 1280: 1276: 1272: 1268: 1264: 1260: 1256: 1247: 1238: 1234: 1232: 1231:outboard gear 1228: 1224: 1220: 1216: 1212: 1208: 1201: 1196: 1187: 1185: 1181: 1177: 1173: 1169: 1161: 1157: 1153: 1149: 1147: 1143: 1139: 1135: 1127: 1118: 1116: 1112: 1107: 1100: 1092: 1090: 1083: 1061: 1053: 1043: 1039: 1034: 1030: 1024: 1021: 1014: 1004: 1000: 995: 991: 985: 982: 973: 963: 959: 954: 948: 944: 937: 932: 919: 913: 901: 900: 899: 897: 893: 888: 886: 882: 878: 871: 864: 857: 850: 843: 836: 829: 822: 815: 788: 778: 774: 769: 765: 759: 756: 749: 739: 735: 730: 726: 720: 717: 711: 706: 693: 687: 675: 674: 673: 671: 667: 663: 659: 654: 652: 648: 644: 643:tone controls 633: 631: 627: 623: 619: 615: 614:rumble filter 611: 607: 603: 599: 595: 591: 587: 583: 579: 575: 565: 562: 557: 555: 554:demultiplexer 551: 548: 544: 540: 536: 532: 526: 524: 520: 516: 512: 511:rumble filter 508: 504: 500: 498: 494: 490: 486: 481: 479: 475: 471: 467: 463: 458: 456: 452: 448: 444: 439: 437: 429: 425: 424:linear filter 422:Second-order 420: 412: 403: 401: 400:outboard gear 397: 392: 388: 384: 380: 375: 372: 368: 365: 360: 358: 357:Altec Lansing 354: 350: 346: 341: 336: 334: 330: 325: 321: 311: 309: 305: 300: 296: 292: 288: 284: 279: 277: 273: 269: 265: 261: 259: 255: 251: 247: 243: 239: 235: 231: 226: 224: 220: 216: 212: 208: 200: 196: 192: 188: 183: 174: 172: 168: 164: 160: 156: 152: 148: 144: 140: 136: 132: 128: 124: 120: 115: 112: 108: 104: 100: 95: 93: 89: 85: 81: 77: 70: 66: 62: 57: 50: 46: 41: 37: 33: 19: 3841: 3574:Sound module 3534:Drum machine 3476:Effects unit 3369:Player piano 3296:Compact disc 3222: 3218:Effects unit 3103: 3068:Loudness war 3035:Ghost singer 3010:Orchestrator 3005:Horn section 2888:Reverse echo 2848:Equalization 2847: 2818:Delay effect 2768:Punch in/out 2763:Ping-ponging 2731:Effects unit 2726:Effects loop 2716:Audio mixing 2706:Audio filter 2560: 2534: 2525: 2505: 2498: 2488:November 25, 2486:. 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Retrieved 2141:the original 2137:"British EQ" 2131: 2112: 2079: 2045: 1944:pre-emphasis 1940: 1913: 1906: 1895: 1891: 1887:notch filter 1871: 1832: 1823: 1818: 1816: 1807: 1801: 1788: 1776: 1761: 1753: 1751: 1573: 1571: 1435: 1420: 1413: 1409: 1398: 1396: 1338: 1324: 1300: 1271:second-order 1270: 1266: 1252: 1235: 1206: 1205: 1180:third-octave 1179: 1165: 1145: 1141: 1133: 1131: 1102: 1095: 1093: 1085: 1078: 1076: 896:bass control 895: 891: 889: 884: 880: 873: 866: 859: 852: 845: 838: 831: 824: 817: 810: 808: 669: 665: 661: 657: 655: 639: 613: 604:(hiss being 601: 597: 593: 589: 571: 558: 550:pilot signal 542: 538: 527: 503:Equalization 502: 501: 496: 482: 477: 473: 459: 454: 446: 440: 433: 406:Filter types 382: 376: 369: 361: 337: 329:John Volkman 324:multiplexing 317: 286: 282: 280: 272:equalization 271: 262: 257: 253: 227: 223:equalization 222: 219:transmission 204: 198: 190: 147:loudspeakers 116: 96: 91: 88:audio signal 79: 78:, or simply 76:Equalization 75: 74: 61:effect units 36: 3815:Music store 3810:Home cinema 3769:Robert Moog 3754:Max Mathews 3678:Piano tuner 3646:Professions 3622:Scorewriter 3579:Synthesizer 3395:Loudspeaker 3058:Click track 3042:Vocal coach 2985:Backup band 2965:professions 2939:Turntablism 2813:Compression 2798:Pitch shift 2758:Overdubbing 2698:Engineering 2539:Stereophile 1952:white noise 1948:de-emphasis 1792:filter bank 1267:first-order 602:hiss filter 578:frequencies 523:hiss filter 331:working at 187:white noise 177:Terminology 139:microphones 125:, and live 63:for use by 3864:Categories 3805:Home audio 3795:Audiophile 3612:GarageBand 3458:Live music 3400:Headphones 3364:Phonograph 3233:Microphone 3228:Headphones 3174:Electrical 3169:Mechanical 2990:Bandleader 2949:Xenochrony 2904:aesthetics 2868:Noise gate 2828:Distortion 2790:processing 2753:Microphone 2541:magazine, 2308:US 3752928 2290:US 3727896 1855:pink noise 1176:room modes 658:high shelf 618:infrasonic 610:phonograph 608:). 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Index

Parametric equalizer
Equalization (disambiguation)

graphic equalizer
smiley face curve

effect units
electric guitarists
parametric equalizer
sound recording and reproduction
audio signal
hi-fi
filters
bass
treble
recording and radio studios
production control rooms
sound reinforcement
instrument amplifiers
guitar amplifiers
microphones
instrument pickups
loudspeakers
hall acoustics
feedback
public address
music production
timbre
mix

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