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Equalizers

In audio processing, equalization (EQ) is the process of modifying the frequency envelope of a sound. Etymologically, it means to correct, or make equal, the frequency response of another audio device. more...

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The term "equalizer" is sometimes applied to audio filters in general, though strictly speaking not all audio filters are equalizers.

As a related term in communications technology, an equalizer is an electronic filter used to compensate for signal distortion suffered during propagation (physics).

Overview

There are a number of kinds of EQ. Each has a different pattern of attenuation or boost. A peaking equaliser raises or lowers a range of frequencies around a central point in a bell shape. A peaking equalizer with controls to adjust the level (Gain), bandwidth (Q) and center frequency is called a parametric equalizer. If there is no control for the bandwidth (it is fixed by the designer) then it is called a quasi-parametric or semi-parametric equalizer.

Shelving-type equalizers increase or attenuate the level of a wide range of frequencies by a fixed amount. A "low shelf" will affect low frequencies up to certain point and then above that point will have little effect. A high shelf affects the level of high frequencies, while below a certain point, the low frequencies are unaffected.

One common type of equalizer is a graphic equalizer, which consists of a bank of band-pass filters, with an independent gain control for each band. Normally, these bands are tight enough to give at least 3dB or 6dB maximum effect for neighboring bands, and cover the range from around 20Hz to 20kHz (which is approximately the range of human hearing). A simple equalizer might have bands at 20Hz, 200Hz, 2kHz and 20kHz, and might be referred to as a 4-band equalizer. A typical equalizer for live microphone work might have as many as 24 or 32 bands.

Uses

Early telephone systems used equalization to correct for the reduced level of high frequencies in long cables. For example, a particular microphone might be more sensitive to low frequency sounds than to high frequency sounds, so an equalizer would be used to increase the volume of the higher frequencies (boost), and reduce the volume of the low frequency sounds (cut).

One of the most direct uses of equalization is at a live event, where there are microphones and speakers operating simultaneously. An equalizer is used to ensure that there are no frequency bands where there is a round trip gain of greater than 1, as these are heard as audible feedback. Those frequencies are cut at the equalizer to prevent this.

In practice, there is a degree of aesthetics involved, in addition to technical considerations.

Read more at Wikipedia.org


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Btuty 15-Band Equalizer 1U Rack Mount 2 Channels Stereo Graphic Equalizer Z8T8Btuty 15-Band Equalizer 1U Rack Mount 2 Channels Stereo Graphic Equalizer Z8T8 $56.05 Audio Equalizer Eq-215 Dual Channel 15-Band Equalizer 1U Rack Mount Free ShipAudio Equalizer Eq-215 Dual Channel 15-Band Equalizer 1U Rack Mount Free Ship $55.99
$179.00 Sony 7 Band Graphic Equalizer Seq-711 - Works - Made in JapanSony 7 Band Graphic Equalizer Seq-711 - Works - Made in Japan $299.99
Rolls Rpq160b Parametric EqualizerRolls Rpq160b Parametric Equalizer $188.10 00003F9F
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Soundxtreme 7 Band Passive Stereo Graphic Equalizer with Fader Control St-Eq-180Soundxtreme 7 Band Passive Stereo Graphic Equalizer with Fader Control St-Eq-180 $57.92 Graphic Equalizer 15-Band Stereo Eq for Home Audio, Dual Channel Professional DjGraphic Equalizer 15-Band Stereo Eq for Home Audio, Dual Channel Professional Dj $90.99
Rockville Req231 Dual 31 Band Graphic Equalizer Eq with Sub-Output Open BoxRockville Req231 Dual 31 Band Graphic Equalizer Eq with Sub-Output Open Box $65.00 Ab International Model 231 Graphic Equalizer Dual 31 BandAb International Model 231 Graphic Equalizer Dual 31 Band $89.99
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Pyle 5 Bands Graphic Equalizer with Bluetooth, Aux & Rca Inputs/OutputsPyle 5 Bands Graphic Equalizer with Bluetooth, Aux & Rca Inputs/Outputs $38.99 Boss Audio Systems Be7Acp 7” Car Stereo - CarPlay No Dvd | Certified RefurbishedBoss Audio Systems Be7Acp 7” Car Stereo - CarPlay No Dvd | Certified Refurbished $83.29
AudioSource Av-One Vintage Graphic Equalizer Selector and ProcessorAudioSource Av-One Vintage Graphic Equalizer Selector and Processor $120.00 New ListingVintage Yamaha Natural Sound Graphic Equalizer Eq-70 Stereo 10 Band Vgc Tested!New ListingVintage Yamaha Natural Sound Graphic Equalizer Eq-70 Stereo 10 Band Vgc Tested! $159.99
Rockville Req231 Dual 31 Band 1/3 Octave Graphic Equalizer With Sub-Output!Rockville Req231 Dual 31 Band 1/3 Octave Graphic Equalizer With Sub-Output! $97.96 🔥 Pyramid Equalizer/Booster 801 Dual Channel 10 Band Graphic Eq 300 Watts New🔥 Pyramid Equalizer/Booster 801 Dual Channel 10 Band Graphic Eq 300 Watts New $350.00
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Marantz Eq 10 Graphic Stereo EqualizerMarantz Eq 10 Graphic Stereo Equalizer $200.00 New Rockville Req20 19" Pro Dual 10 Band Graphic Equalizer Eq w/Dual Vu MetersNew Rockville Req20 19" Pro Dual 10 Band Graphic Equalizer Eq w/Dual Vu Meters $58.95
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Compact 5-Band Eq Preamp Equalizer Stereo Audio Processor for Amplifier/SpeakerCompact 5-Band Eq Preamp Equalizer Stereo Audio Processor for Amplifier/Speaker $56.99 Eq-215 2-Channel 15-Band Equalizer 1U Rack Mount Stereo Graphic Equalizer A3O0Eq-215 2-Channel 15-Band Equalizer 1U Rack Mount Stereo Graphic Equalizer A3O0 $55.82
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Dbx Dual Channel Graphic Equalizer Switchable ±6 or ±15 dB 215s 15-Band NewDbx Dual Channel Graphic Equalizer Switchable ±6 or ±15 dB 215s 15-Band New $200.00 Art 351 Eq 31-Band 1/3 Octave Graphic EqualizerArt 351 Eq 31-Band 1/3 Octave Graphic Equalizer $104.00
Pyle 10-Channel Active Rack Mountable Equalizer w/Rca In, Graphic Eq & FeedbackPyle 10-Channel Active Rack Mountable Equalizer w/Rca In, Graphic Eq & Feedback $198.99 Rockville Req42-S Silver 19" 2x21 Band Graphic EqualizerRockville Req42-S Silver 19" 2x21 Band Graphic Equalizer $69.95
Rockville Req42-B Black 19" 2 x 21 Band Graphic EqualizerRockville Req42-B Black 19" 2 x 21 Band Graphic Equalizer $69.95 Soundscraftsmen EqualizerSoundscraftsmen Equalizer $199.99
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Rockville Req20 19" Pro Rack Mount Dual 10-Band Graphic Equalizer Eq+Vu MetersRockville Req20 19" Pro Rack Mount Dual 10-Band Graphic Equalizer Eq+Vu Meters $69.95 New ListingTechnics Sh-Ge50 Stereo Graphic Equalizer 7 Band Tested WorkingNew ListingTechnics Sh-Ge50 Stereo Graphic Equalizer 7 Band Tested Working $55.00
Audio Spectrum Analyzer, Dual Channel 15-Band Equalizer Home Audio, DigitalAudio Spectrum Analyzer, Dual Channel 15-Band Equalizer Home Audio, Digital $108.00 *Brand New Ashly Gqx-3102* Dual 31-Band Graphic Equalizer.*Brand New Ashly Gqx-3102* Dual 31-Band Graphic Equalizer. $399.00
Ct Sounds Ct-7Eq 7 Band 1/2 Din Parametric Car Audio Equalizer with Aux InputCt Sounds Ct-7Eq 7 Band 1/2 Din Parametric Car Audio Equalizer with Aux Input $37.99 Audio Control The Rialto 7 Channel Equalizer Crossover 5.1 Surround SoundAudio Control The Rialto 7 Channel Equalizer Crossover 5.1 Surround Sound $159.99
Ds18 Eqx5 8 Volts 5-Band Equalizer with High Level Input - Adjustable BassDs18 Eqx5 8 Volts 5-Band Equalizer with High Level Input - Adjustable Bass $41.21 7 Band Passive Stereo Graphic Equalizer with Fader Control St-Eq-1807 Band Passive Stereo Graphic Equalizer with Fader Control St-Eq-180 $56.76
New ListingTechnics Sh-8044 Stereo Graphic Equalizer Analog Hi Fi Silver. Nice VintageNew ListingTechnics Sh-8044 Stereo Graphic Equalizer Analog Hi Fi Silver. Nice Vintage $199.00 Vintage Rane Pe-15, 5 Parametric Band Eq Equalizer & Manual Looks & Works GreatVintage Rane Pe-15, 5 Parametric Band Eq Equalizer & Manual Looks & Works Great $299.00
Taramps Teq 7 Stereo 7-Band Graphic Equalizer Rca Input 2 Channels Car AudioTaramps Teq 7 Stereo 7-Band Graphic Equalizer Rca Input 2 Channels Car Audio $54.99 New ListingPioneer Sg-9500 Graphic Equalizer Professionally Serviced Multi Voltage EuroNew ListingPioneer Sg-9500 Graphic Equalizer Professionally Serviced Multi Voltage Euro $775.00
Art Tube Eq - Professional Parametric Tube Equalizer - Black - 2010'sArt Tube Eq - Professional Parametric Tube Equalizer - Black - 2010's $99.99 Hafler 110 Stereo Preamp Dh-330 Stereo Tuner Dh-160 Equalizer *See Description*Hafler 110 Stereo Preamp Dh-330 Stereo Tuner Dh-160 Equalizer *See Description* $699.00
Ds18 Eqx7 Equalizer 7 Bands with auto Hi/Lo line Selector and Auto Turn OnDs18 Eqx7 Equalizer 7 Bands with auto Hi/Lo line Selector and Auto Turn On $59.96 Dbx 215 Dual Channel 15 Band Graphic Equalizer NewOpens in a new window or tabOpen BoxDbx 215 Dual Channel 15 Band Graphic Equalizer NewOpens in a new window or tabOpen Box $152.00
Hifi Bluetooth 5-Band Eq Equalizer Stereo Audio Preamp Speaker Receiver Vu MeterHifi Bluetooth 5-Band Eq Equalizer Stereo Audio Preamp Speaker Receiver Vu Meter $99.99 Timpano Car Audio Equalizer Tpt-Eq7 10V with subwoofer control 7 Band Graphic EqTimpano Car Audio Equalizer Tpt-Eq7 10V with subwoofer control 7 Band Graphic Eq $53.45
Black Diamond 7-Band Stereo Equalizer/Crossover Pre Amp Equalizer - Eq7LsBlack Diamond 7-Band Stereo Equalizer/Crossover Pre Amp Equalizer - Eq7Ls $49.99 5-Band Car Audio Equalizer, Adjustable 5 Bands Eq Car Amplifier Graphic50815-Band Car Audio Equalizer, Adjustable 5 Bands Eq Car Amplifier Graphic5081 $23.99
Fredenstein Artistic Eq 500 Series EqualizerFredenstein Artistic Eq 500 Series Equalizer $254.15 215 Dbx Dual Channel 15-Band Graphic Equalizer Brand New215 Dbx Dual Channel 15-Band Graphic Equalizer Brand New $150.00
Datex2 - Date Dx2 dual batteries equalizer, parallel battery balancer & combinerDatex2 - Date Dx2 dual batteries equalizer, parallel battery balancer & combiner $99.00 to Cinema Engineering Program Equalizer Type 4031-B Excellent ConditionCinema Engineering Program Equalizer Type 4031-B Excellent Condition $2,000.00
Clarion Eqs-755 7-Band Graphic Equalizer W/ Front 3.5Mm Aux Input & Rear Rca AuxClarion Eqs-755 7-Band Graphic Equalizer W/ Front 3.5Mm Aux Input & Rear Rca Aux $89.75 Yamaha Model Gq2015A Dual Channel Professional Audio Music Graphic EqualizerYamaha Model Gq2015A Dual Channel Professional Audio Music Graphic Equalizer $85.00
Stetsom Eqx764 Eq Graphic Equalizer 7 Band EqualizationStetsom Eqx764 Eq Graphic Equalizer 7 Band Equalization $79.99 Adc Sound Shaper Two Stereo Frequency Equalizer Ss-2 Tested Works Vintage JapanAdc Sound Shaper Two Stereo Frequency Equalizer Ss-2 Tested Works Vintage Japan $125.00
215 New Dbx Dual Channel 15-Band Graphic Equalizer215 New Dbx Dual Channel 15-Band Graphic Equalizer $150.00 New ListingYamaha Eq-70 Natural Sound Graphic Equalizer 10-Band Stereo Very CleanNew ListingYamaha Eq-70 Natural Sound Graphic Equalizer 10-Band Stereo Very Clean $100.00
Btuty Audio Equalizer Eq-215 Dual Channel 15-Band Equalizer 1U Rack Mount T1V4Btuty Audio Equalizer Eq-215 Dual Channel 15-Band Equalizer 1U Rack Mount T1V4 $60.16
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