Discover great deals on the many top brand items available only on eBay!


This site contains sponsored affiliate links.

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...

HomeHome
Accessories & CablesAccessories & Cables
AmplifiersAmplifiers
CD Players & RecordersCD Players & Recorders
Cassette DecksCassette Decks
CrossoversCrossovers
DVD Players & Recorders DVD Players & Recorders
Digital Music...Digital Music...
Digital Video Recorders, PVRDigital Video Recorders, PVR
EqualizersEqualizers
Headphones, HeadsetsHeadphones, Headsets
Home Audio MiscHome Audio Misc
Home Theater ProjectorsHome Theater Projectors
Home Theater in a Box Home Theater in a Box
KaraokeKaraoke
MiniDisc PlayersMiniDisc Players
OtherOther
PreamplifiersPreamplifiers
ProcessorsProcessors
RadiosRadios
ReceiversReceivers
Remote ControlsRemote Controls
Satellite Radio Satellite Radio
Satellite, Cable TVSatellite, Cable TV
Shelf, Compact SystemsShelf, Compact Systems
Speakers & SubwoofersSpeakers & Subwoofers
Televisions TVTelevisions TV
Tuners, AM/FMTuners, AM/FM
TurntablesTurntables
VCRsVCRs
Vintage ElectronicsVintage Electronics
Wholesale LotsWholesale Lots

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


[List your site here Free!]

215 New Dbx Dual Channel 15-Band Graphic Equalizer215 New Dbx Dual Channel 15-Band Graphic Equalizer $150.00 New ListingYamaha Eq-550 Natural Sound Stereo Graphic Equalizer Works perfectly.New ListingYamaha Eq-550 Natural Sound Stereo Graphic Equalizer Works perfectly. $275.00
Rockville Req42-B Black 19" Rack Mount 2 x 21 Band EqualizerRockville Req42-B Black 19" Rack Mount 2 x 21 Band Equalizer $74.95 Technics Sh-8033 Real Time Spectrum Graphic Stereo 7-band Equalizer TestedTechnics Sh-8033 Real Time Spectrum Graphic Stereo 7-band Equalizer Tested $109.99
Behringer Eq700 Graphic Equalizer PedalBehringer Eq700 Graphic Equalizer Pedal $31.90 Blaupunkt Ep1800X 7-Band Car Audio Graphic Equalizer with Front 3.5mm AuxiliaryBlaupunkt Ep1800X 7-Band Car Audio Graphic Equalizer with Front 3.5mm Auxiliary $39.95
Vintage Old School Kenwood Kgc-6042A Graphic Equalizer 9 Bands*Tested Works*Vintage Old School Kenwood Kgc-6042A Graphic Equalizer 9 Bands*Tested Works* $399.00 Klark Teknik Eqp-Kt Classic Tube EqualizerKlark Teknik Eqp-Kt Classic Tube Equalizer $289.00
AudioSource Model Eq Eight Series Ii Working Good ConditionAudioSource Model Eq Eight Series Ii Working Good Condition $75.00 New A3S Audio 7-Band Graphic Equalizer W/ Front 3.5Mm Aux Input & Rear Rca AuxNew A3S Audio 7-Band Graphic Equalizer W/ Front 3.5Mm Aux Input & Rear Rca Aux $64.99
7 Band Passive Stereo Graphic Equalizer with Fader Control Wireless Black7 Band Passive Stereo Graphic Equalizer with Fader Control Wireless Black $98.98 Ds18 Dsp4.8Btm Dsp Crossover Equalizer 4-Channel Digital Sound ProcessorDs18 Dsp4.8Btm Dsp Crossover Equalizer 4-Channel Digital Sound Processor $179.00
Technical Pro Eq7153 Rack Mount Dual 21-Band Dj/Pro Audio EqualizerTechnical Pro Eq7153 Rack Mount Dual 21-Band Dj/Pro Audio Equalizer $89.99 Equalizer Industries Equalizer Visual Vacuum Plunger Cups - Set of 2Equalizer Industries Equalizer Visual Vacuum Plunger Cups - Set of 2 $170.51
Professional Audio Processor Equalizer Digital Reverb Multi Effect Dsp ProcessorProfessional Audio Processor Equalizer Digital Reverb Multi Effect Dsp Processor $54.99 7 Band Graphic Equalizer Dual Channel Output Input 12dB Sound Equalizer Zxs7 Band Graphic Equalizer Dual Channel Output Input 12dB Sound Equalizer Zxs $28.28
Professional Dual 10 Band Equalizer with Individual Led IndicatorsProfessional Dual 10 Band Equalizer with Individual Led Indicators $119.99 Equalizer CastEqualizer Cast $54.18
4 Crossfire Tire Equalizer System 110 Psi Stainless Steel Hoses4 Crossfire Tire Equalizer System 110 Psi Stainless Steel Hoses $314.04 Clarion Eqs755v Eq 7 Band Equalizer Aux. 8 Volt Sub Subwoofer Speakers Pre AmpClarion Eqs755v Eq 7 Band Equalizer Aux. 8 Volt Sub Subwoofer Speakers Pre Amp $79.00
Pioneer Deq-7600 Digital Signal Processor - Car Equalizer - Working No ReservePioneer Deq-7600 Digital Signal Processor - Car Equalizer - Working No Reserve $177.50 Technics Sh-Gs91 Digital Sound Processor Equalizer Eq Spectrum Analyzer RareTechnics Sh-Gs91 Digital Sound Processor Equalizer Eq Spectrum Analyzer Rare $399.95
Rockville Req42-B Black 19" 2 x 21 Band Graphic EqualizerRockville Req42-B Black 19" 2 x 21 Band Graphic Equalizer $73.95 31Band Music Equalizer Dual Channel 15-Band Home Audio Digital Spectrum Analyzer31Band Music Equalizer Dual Channel 15-Band Home Audio Digital Spectrum Analyzer $89.35
Compact 5-Band Eq Preamp Equalizer Stereo Audio Processor for Amplifier/SpeakerCompact 5-Band Eq Preamp Equalizer Stereo Audio Processor for Amplifier/Speaker $46.99 Yamaha Ydg2030 Graphic Equalizer - Manual Included - Excellent Condition!Yamaha Ydg2030 Graphic Equalizer - Manual Included - Excellent Condition! $225.00
Rockville R7Eq 1/2 Din 7 Band Car Audio Equalizer Eq w/ Front, Rear + Sub OutputRockville R7Eq 1/2 Din 7 Band Car Audio Equalizer Eq w/ Front, Rear + Sub Output $44.95 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 $71.95
Equalizer N Bolt Hutch Eq019KEqualizer N Bolt Hutch Eq019K $109.99 Taramps Teq 7.4 Stereo 7-Band Graphic EqualizerTaramps Teq 7.4 Stereo 7-Band Graphic Equalizer $70.00
Stetsom Eqx764 Eq Graphic Equalizer 7 Band EqualizationStetsom Eqx764 Eq Graphic Equalizer 7 Band Equalization $79.99 AudioSource Eq 100 Graphic Equalizer & Spectrum Analyzer - No CablesAudioSource Eq 100 Graphic Equalizer & Spectrum Analyzer - No Cables $60.00
New ListingPeavey Eq215 Stereo Graphic EqualizerNew ListingPeavey Eq215 Stereo Graphic Equalizer $39.99 Vintage Teac Eqa-10 Graphic Equalizer - Silver FaceVintage Teac Eqa-10 Graphic Equalizer - Silver Face $99.99
Digital Equalizer, 31-Band Dual Channel Synchronized Control Audio EqualizerDigital Equalizer, 31-Band Dual Channel Synchronized Control Audio Equalizer $149.00 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 $54.47
Soundxtreme 7 Band Pre Amp Graphic Car Audio Stereo Equalizer Eq w/ sub outSoundxtreme 7 Band Pre Amp Graphic Car Audio Stereo Equalizer Eq w/ sub out $48.99 Rockville Req20 19" Rack Mount Pro Dual 10 Band Graphic Equalizer Eq w/Vu MetersRockville Req20 19" Rack Mount Pro Dual 10 Band Graphic Equalizer Eq w/Vu Meters $48.82
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 New ListingTechnics Sh-Ge50 Stereo Graphic Equalizer 7 Band Audiophile WorksNew ListingTechnics Sh-Ge50 Stereo Graphic Equalizer 7 Band Audiophile Works $89.95
Realistic 31-2018A Ten Band Equalizer Stereo Eq HiFi Audio Radio Shack TestedRealistic 31-2018A Ten Band Equalizer Stereo Eq HiFi Audio Radio Shack Tested $56.95 Rockville Req42-S Silver 19" 2x21 Band Graphic EqualizerRockville Req42-S Silver 19" 2x21 Band Graphic Equalizer $73.95
Vintage Pioneer Sg-540 14 Channel Graphic EqualizerVintage Pioneer Sg-540 14 Channel Graphic Equalizer $75.00 AudioSource Model Eq 200 Graphic EqualizerAudioSource Model Eq 200 Graphic Equalizer $71.00
Professional Graphic Equalizer Dual 31-Band Equalizer Spectrum Led DisplayProfessional Graphic Equalizer Dual 31-Band Equalizer Spectrum Led Display $151.29 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 $85.99
Equalizer Hutch Eq019 097800, 1615801 E16393 E7532 097800 R307532Equalizer Hutch Eq019 097800, 1615801 E16393 E7532 097800 R307532 $87.99 Equalizer Systems 3197sbt Eq Smart Level Bluetooth Leveling control panelEqualizer Systems 3197sbt Eq Smart Level Bluetooth Leveling control panel $450.00
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 Svi International 5595922 Equalizer Cable Xpr-Cl12, 34ft *Great Condition*Svi International 5595922 Equalizer Cable Xpr-Cl12, 34ft *Great Condition* $129.98
Numark Eq-2550 Equalizer - Tested And WorkingNumark Eq-2550 Equalizer - Tested And Working $50.00 Audio Source Eq100 Graphic Equalizer - Black *Pre-owned*Audio Source Eq100 Graphic Equalizer - Black *Pre-owned* $44.99
New ListingTeac Eqa-3 Graphic Equalizer, Hi-Fi Audio, 10 Band, Vintage, RareNew ListingTeac Eqa-3 Graphic Equalizer, Hi-Fi Audio, 10 Band, Vintage, Rare $22.50 Ds18 Eqx7Pro Car Stereo Equalizer/Crossover High Volt 7-Band Auto Turn OnDs18 Eqx7Pro Car Stereo Equalizer/Crossover High Volt 7-Band Auto Turn On $89.95
Reyco Equalizer W/Trb5024 Eq005Reyco Equalizer W/Trb5024 Eq005 $185.95 Pyle 7 Bands Graphic Equalizer w/ Sub Volume Adjustable for Subwoofer ChannelPyle 7 Bands Graphic Equalizer w/ Sub Volume Adjustable for Subwoofer Channel $27.20
Kenwood Ge-5010 Stereo Graphic Equalizer Spectrum Analyzer 10 Band Works JapanKenwood Ge-5010 Stereo Graphic Equalizer Spectrum Analyzer 10 Band Works Japan $179.00 882i Bbe Sonic Maximizer Rackmount Unit 1U With 2Pcs Xlr Cables New882i Bbe Sonic Maximizer Rackmount Unit 1U With 2Pcs Xlr Cables New $200.00
XtremepowerUs Weight Distribution Equalizer Bar Sway Control Trailer 2" TowingXtremepowerUs Weight Distribution Equalizer Bar Sway Control Trailer 2" Towing $230.95 Yamaha Eq-50 Natural Sound 10 Band Graphic EqualizerYamaha Eq-50 Natural Sound 10 Band Graphic Equalizer $99.99
Prv Eq7-15 Car Audio Equalizer 7 Band 1/2 Din 6 Channel Rca Output Graphic EqPrv Eq7-15 Car Audio Equalizer 7 Band 1/2 Din 6 Channel Rca Output Graphic Eq $84.91 AudioSource - Model Eq Eight/Series Ii - 10 Band Graphic Equalizer - UsedAudioSource - Model Eq Eight/Series Ii - 10 Band Graphic Equalizer - Used $49.00
Vintage Pioneer Eq-6500 - 9 Band Parametric Car Equalizer Working No ReserveVintage Pioneer Eq-6500 - 9 Band Parametric Car Equalizer Working No Reserve $31.00 New ListingSony Seq-50 Walkman Eq Stereo Graphic Equalizer 1980 New ListingSony Seq-50 Walkman Eq Stereo Graphic Equalizer 1980  $200.00
Adc Sound Shaper Ss-Viii Music Memory 8 Dual 10 Band Stereo Frequency EqualizerAdc Sound Shaper Ss-Viii Music Memory 8 Dual 10 Band Stereo Frequency Equalizer $31.01
Click to see more Equalizers items at www.ebay.com
Prices current as of last update, 05/08/25 11:20pm.

See also...

Home Contact Resources Exchange Links ebay