Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
Best Choice BOSS  New
Boss EQ-200 Guitar Effects Pedal Graphic Equaliser Dual 10-band EQs that can be used in stereo, parallel or seriesBOSS  New
BOSS GE-7 Graphic Equalizer Pedal Compact EQ pedal with 7 bands of adjustable EQ slidersBest Value Behringer  New
Behringer FBQ3102HD Behringer FBQ3102HD Ultragraph Pro Equalizer Professional 31-band stereo graphic equalizer for live and studio applicationsBehringer  New
Behringer EQ700 Graphic Equalizer Pedal 7-band graphic equalizer that can suppress feedback by attenuating the frequency band of feedback Also useful for aggresBehringer  New
Behringer FBQ800 Minifbq Ultra Compact 9 Band Graphic Equalizer Behringer FBQ800 Minifbq Ultra Compact 9 Band Graphic EqualizerGeneric  New
20 Band HiFi Audio Equalizer, Professional Digital Graphic Effects Tuning Equalizer, with Remote Control, LED Spectrum D 【Precise Audio Adjustments】Our 20 Band Hifi Audio Equalizer enables you to achieve perfect audio balance and refinementSONLED  NewStereo Audio Mixer Dual, 31 Band Equalizer, Graphic Equalizer Effect Controller Dj Digital Mixer Processor Dsp Feedback 【31-Band Spectrum】DSP processing equalizer is equipped with an LED spectrum indicator that displays the 31-band frequencCYTBEK  New31-Band Stereo Graphic Equalizer, Graphic Equalizer Balanced Effect Controller Dj Digital Mixer Processor Dsp Feedback E 【31-Band Spectrum】DSP processing equalizer is equipped with an LED spectrum indicator that displays the 31-band frequencBehringer  NewBehringer FBQ6200HD FBQ6200HD Behringer FBQ6200HD Ultragraph Pro High-Definition 31-Band Stereo Graphic Equalizer, Silve Audiophile 31-band stereo graphic equalizer for live and studio applicationsALLUMYTH  NewMini Professional Feedback Suppressor, 3-in 1-Out Wireless Microphone Feedback Suppressor, Digital Audio Processor, Auto 【Feedback Suppressor】The digital processing chip runs with high configuration, automatically identifies the audio signalDSAFRR  NewMixer Audio, 2U Graphic Equalizer 31 Band Balanced Effect Controller DJ Digital Mixer Processor DSP Feedback Eliminator Digital equalizer and filter capacitor can adjust the sensitivity of high/medium/low frequency to make its sound field wgeneric  NewDual 20-Band Stereo Equalizer, Digital Audio Effects Controller with 5.0 Bluetooth & Remote Control, HiFi Home Eq Tuning 【Dual 20-band Equalizer】: Features an accurate real-time frequency level display with dual 20-band spectrum analysis, utBehringer  NewBehringer FBQ1502HD Behringer FBQ1502HD Ultragraph Pro High-Definition 15-Band Stereo Graphic Equalizer Professional 15-band stereo graphic equalizer for live and studio applicationsPhosphophyllite  NewGraphic Equalizer, 31 Band Balanced Effect Controller, DJ Digital Mixer Processor, DSP Feedback Eliminator, Stage Enhanc 【High Quality】signal strength of each frequency band of treble/midrange/bass is independently adjusted to help you easilGeneric  NewDual 20-Band Stereo Equalizer, Dual channel synchronized control, Digital Audio Effects Controller, Hifi Home EQ Tuning Dual 20-Band Stereo Equalizer: Experience precision audio tuning with our Dual 20-Band Stereo Equalizer, featuring an acQUTBAG  NewGraphic Equalizer, 31 Band Balanced Effect Controller, DJ Digital Mixer Processor, DSP Feedback Eliminator, Stage Enhanc 【31-Band Spectrum】DSP processing equalizer is equipped with an LED spectrum indicator that displays the 31-band frequencSUCRFXJ  NewDual 31-band Profesional Graphic Equalizer, Audio Spectrum Stereo Analyzer,DJ Digital Mixer Processor Indicator,Balanced 【Dual 31-Band Spectrum Display】Experience real-time changes in the dual 31-band frequency points with the LED spectrum iGeneric  New20 Band HiFi Audio Equalizer, Professional Digital Graphic Effects Tuning Equalizer, with Remote Control, LED Spectrum D 【Precise Audio Adjustments】Our 20 Band Hifi Audio Equalizer enables you to achieve perfect audio balance and refinementCYTBEK  New31-Band Stereo Graphic EQ, Equalizer Amplifier with Customize 10 Preset Results and Automatic Noise Reduction, Independe 【31-Band Spectrum】DSP processing equalizer is equipped with an LED spectrum indicator that displays the 31-band frequencPRV AUDIO  NewPRV AUDIO Car Audio DSP 2.8X Digital Crossover and Equalizer 8 Channel Full Digital Signal Audio Processor DSP with Sequ INTUITIVE INTERFACE CAR AUDIO DSP PROCESSOR: Through an LCD display (16x2 Characters) and intuitive interface, it allowsZECRGOGO  NewGraphic Equalizer,31-Band Dual Channels Stereo Audio Effect Controller,DJ Digital Mixer Processor,DSP Feedback Eliminato 31-Band Spectrum:DSP processing equalizer is equipped with an LED spectrum indicator that displays the 31-band frequencyGHRERTX  New31-Band Dual Channels Graphic Equalizer,Stereo Audio Effect Controller,DJ Digital Mixer Processor,DSP Feedback Eliminato Integrated Equalization System:car audio equalizer amplifier, 10 presets can manually adjusted or customized, such as flGeneric  New22-Band Graphic Equalizer, LED Music Spectrum Analyzer, Dual Channel 1U Audio Processor, with 10 Preset Effects, Automat Professional 22-Band Graphic Equalizer: Experience studio-grade audio processing with this 1U rack-mounted digital musicLBMED  New31-Band Stereo Graphic Equalizer EQ, Professional 2-Channel Graphic Equalizer, Dsp Feedback Eliminator, Customize 10 Pre 【Integrated Equalization System】Car audio equalizer amplifier, 10 presets can be manually adjusted or customized, such aJectse  New7 Band Sound Equalizer 12dB High Bass Dual Channel Digital Equalizer, Aluminum Alloy, Compatible with Headphones, 3.5mm Control Range: 7 band equalization circuit control range ± 12dB, equalization band: 60HZ,150HZ,400HZ,1KHZ,3KHZ,6.5KHZ,15briidea  Newbriidea Load Equalizer and Stabilizer Controller/Resistor Compatible with Harley Davidson Motorcycle, Led Turn Signals, ACHIEVE STABLE TURN SIGNAL PERFORMANCE: The load equalizer and stabilizer controller is designed to optimize the electriPRV AUDIO  NewPRV AUDIO Car Audio DSP 2.4X Digital Crossover and Equalizer 4 Channel Full Digital Signal Audio Processor DSP with Sequ INTUITIVE INTERFACE CAR AUDIO DSP PROCESSOR: Through an LCD display (16x2 Characters) and intuitive interface, it allowsQUTBAG  New31 Bands Graphic Equalizer, 1-Channel Audio Digital Equalizador with Customize 10 Preset Results and Automatic Noise Red 【31-Band Spectrum】DSP processing equalizer is equipped with an LED spectrum indicator that displays the 31-band frequencSpdazzleburst  NewDual 31-Band Digital Equalizer, 31-Band Stereo Graphic EQ, 10 Preset Effects and Low/mid/treble Independent Adjustment, 【31-Band Spectrum】DSP processing equalizer is equipped with an LED spectrum indicator that displays the 31-band frequencGeneric  New31-Band Stereo Graphic Equalizer, Professional Digital EQ with LCD Display, 10 Preset Effects, Graphic Equalizer with LE 【Real-Time 31-Band Display】Our DSP processing equalizer features an LED stereo indicator that displays real-time changesNinja Shark  NewEqualiser v2.0 (Black, L/XL) Panoramic 180° View: Immerse yourself in an unparalleled underwater experience with the Equaliser PRO Snorkel Mask. Itshuanzhi  Newhuanzhi Auto Car Remote Amplifier Subwoofer Car Audio Equalizer Crossover Bass Controller Bass Equalizer Controller 4 RC Features:SUCRFXJ  New22-Band Digital Audio Equalizer, Music Spectrum Analyzer,Stereo Graphic Equalizer with 10 Preset Effects, Automatic Nois 22-Band Digital Audio Equalizer :High/mid/bass independent adjustment function, compatible with multiple device inputs,Behringer  NewBehringer ULTRAGRAPH PRO FBQ1502HD High-Definition 15-Band Stereo Graphic Equalizer with FBQ Feedback Detection System Professional 15-band stereo graphic equalizer for live and studio applicationsDRUXTO  NewEQ Equalizer Dual Channel 31 Band, Professional Stereo Equalizer with HD LCD display DSP processing chip Intelligent noi 1. Professional Noise Reduction Equalizer: Our equalizer is designed with advanced digital signal processing technologyLBMED  New22-Band Audio Equalizer, Stereo Graphic Equalizer with Dsp Equalization Processor, 10 Preset Effects Preservation,Suppor 【22 Band Design】The equalizer is designed with 12 frequency bands per channel, using a DSP equalizer processor, frequencDomary  NewDomary 10 Band EQ Guitar Bass Mini Equalizer Effect Pedal Single Block True Bypass Aluminum Body Band Controller DC9V fo [Versatile Use] : This single block eq pedal features 10 bands with adjustable settings from 31.25hz to 16khz, suitableGeneric  New31-Band Digital Equalizer, Stereo Graphic Equalizer, 10 Preset Effects, High, Medium And Bass Adjustment, With Dedicated 【31-Band Digital Equalizer】: This 31-Band Digital Equalizer features an audio spectrum analyzer with accurate real-timeMIZISNR  NewMIZISNR Digital Equalizer for Home Stereo Audio System, Professional 31 Band Dual Channel Graphic Equalizer Music EQ wit Precision 31-Band DSP Equalization with PC Tuning: Shape your sound with a professional-grade 31-band digital equalizer.Mingzhe  NewMingzhe EX EQ7 Guitar Equalizer Effect Pedal 7-Band EQ Full Metal Shell True Bypass 7-band EQ slider, ±15dB adjustable gain range per band.DZPOXSBO  New31-Band Digital Equalizer,Equalizer Home Audio, Stereo Graphic EQ, Music Spectrum Analyzer,Led Spectrum Indicator,Noise 【31-Band Design】Our digital equalizer adopts 31-band design, the adjustable range of each band is ±12dB, the sealed knobDZPOXSBO  New31-Band Digital Equalizer,Equalizer Home Audio, Stereo Graphic EQ, Music Spectrum Analyzer,Led Spectrum Indicator,Noise 【31-Band Design】Our digital equalizer adopts 31-band design, each band has an adjustable range of ±12dB, sealed knob conNinja Shark  NewEqualiser v2.0 (Black, S/M) Panoramic 180° View: Immerse yourself in an unparalleled underwater experience with the Equaliser PRO Snorkel Mask. ItsDouk Audio  NewNobsound Auto Car Amplifier Audio Subwoofer Bass Control Knob Sub Gain Equalizer Regulator Frequency Controller RCA Line Enhanced Audio Control: Easily add subwoofer level controls or balance multiple amplifiers in your vehicle with the NobsZECRGOGO  NewGraphic Equalizer, 31-Band Stereo Audio Effect Controller with Digital Audio,10 Preset Effects, High, Mid and Bass Adjus 31-Band Spectrum:DSP processing equalizer is equipped with an LED spectrum indicator that displays the 31-band frequencyDZPOXSBO  New31-Band Digital Equalizer,Equalizer Home Audio, Stereo Graphic EQ, 10 Preset Effects & Automatic Noise Reduction,Led Spe Adjust the equalizer: This machine adopts the new DSP digital processor technology, which is used to integrate digital aXGHDPBM  New31 Band Digital Equalizer, Audio Graphic Digital Equalizador, Professional One Channel Stereo Equalizer with 10 Preset E 【Real-Time Frequency Adjustment】 Our 31-band digital equalizer is equipped with a LED spectrum indicator that displays tDZPOXSBO  New31-Band Digital Equalizer,Equalizer Home Audio, Stereo Graphic EQ, 10 Preset Effects & Automatic Noise Reduction,Led Spe Professional Noise Reduction Equalizer: Our equalizer is designed with advanced digital signal processing technology toTaramp's  NewTaramps Pro 2.4S DSP Crossover full Digital Signal Processor and Equalizer with sequencer 15-band Graphic Equalization 1 Band Equalizer: It has 15 bands of equalizaon, with aenuaon /boost of up to 12dB, at the center frequencies defined in tCT Sounds  NewCT Sounds CT-7EQ 7 Band 1/2 Din Parametric Car Audio Equalizer The CT-7EQ is a 7 band 1/2 din parametric car audio equalizer designed to divide and enhance the segment of frequency foSONLED  NewEQ Equalizer Dual Channel 31 Band, Professional Stereo Equalizer with HD LCD display, Can Be Saved Stereo Intelligent No Professional Noise Reduction Equalizer: Our equalizer is designed with advanced digital signal processing technology toTaramp's  NewTaramps Pro 2.8S White DSP Crossover Full Digital Signal Audio Processor and Equalizer with sequencer 15-Band Graphic Eq Pro 2.8S is ideal for 8-way projects, allowing detailed configurations, such as graphic and parametric equalizations, hiDZPOXSBO  New31-Band Digital Equalizer,Equalizer Home Audio, Stereo Graphic EQ, Music Spectrum Analyzer,Led Spectrum Indicator,Noise 【Professional 31-Band Equalizer】: This audio spectrum analyzer features real-time frequency point levels for each of theCYTBEK  NewEQ Equalizer Dual Channel 31 Band, Professional Stereo Equalizer with HD LCD display, Can Be Saved Stereo Intelligent No Professional Noise Reduction Equalizer: Our equalizer is designed with advanced digital signal processing technology toAudiopipe  NewAudiopipe 9 Band Graphic Equalizer with 9 V LINE Driver (EQ-909X) NICKEL PLATED LOCKING ADJUSTABLE KNOBS: Our 9 Band Graphic Equalizer uses nickel plated adjustable knobs for ideal abrasLBMED  New31-Band Stereo Graphic Eq, Professional 2-Channel Graphic Equalizer with FBQ Feedback Detection System and Automatic Noi 【31-Band Stereo Graphic Equalizer】Equipped with FBO feedback detection system, for studio and live performances, pink noDonner  NewDonner EQ Seeker Ten Band Equalization Guitar Effect Pedal True Bypass 【Unique design】Convenient compact size,Suitable for any music style.The EQ Seeker is designed and built with carefully sgernie  NewStereo EQ Equalizer, 3 Band Equalizer Stereo EQ Preamp, High Medium Low 3 Band Sound Channel Balance Volume Control Prea FOR CAR USES: EQ equalizer built in isolated booster power supply to ensure signal purity and dynamic range; Because isGeneric  New31-Band Graphic Equalizer – Dual Channel Stereo Audio Effect Controller with LED Spectrum Display, 10 Preset Effects & D 【31-Band Precision Control】Featuring a 31-band design with a ±12dB adjustable range for each frequency band, allowing foStetsom  NewStetsom EQX764 Graphic Equalizer 7 Band Equalization with 4 Input and 6 Output Channels, Input Channel Selection Switch The Stetsom EQX764 is capable of reinforcing or attenuating audio in 7 different frequency ranges, allowing you to adjusXGHDPBM  New31-Band Digital Stereo Equalizer, Professional Dual Channel Equalizador, Audio Processor Sound Controller, 10 Preset Res 【Enhanced Sound Quality Enhancement】Our 31-band digital stereo equalizer is designed to modify the music and improve itsXGHDPBM  New31-Band Graphic Equalizer, Professional Dual-Channel Stereo Equalizador, Audio Processor Spectrum Effect Controller with 【Enhanced Sound Quality Enhancement】Our equalizer allows for precise modification of music to greatly improve the soundLyaciomn  NewLyaciomn Auto Car Remote Amplifier Subwoofer Car Audio Equalizer Crossover Bass Controller Bass Equalizer Controller 4 R DRUXTO  NewAudio Equalizer EQ, Dual Channel 31 Band Equalizer HD LCD display Delicate processing procesador de audio 10 modes can b 1. Professional Noise Reduction Equalizer: Our equalizer is designed with advanced digital signal processing technologyDRUXTO  NewDRUXTO Stereo Equalizers for Home Audio, Dual Channel 31 Band Equalizer Hd Lcd Display Delicate Procesador de Audio 10 M 1. Professional Noise Reduction Equalizer: Our equalizer is designed with advanced digital signal processing technologyGHRERTX  NewDigital Graphic Equalizer,Spectrum Display 31 Band Stereo,10 Effect Modes Can Be Pre-stored, High,Mid and Bass Adjustmen Easy-to-Use Controls:adopts new DSP digital processor technology,Each section with LED spectrum indication, real-time 31Gugxiom  NewCar Audio Graphic Equalizer, 7‑Band Car Audio Equalizer, Car Parametric Equalizer, Universal Low Pass 7‑Band Variable Ga SEVEN EQUALISED BANDS:7-band car audio graphic equaliser with built-in low pass (front, rear and subwoofer) and 7-band gGugxiom  NewGugxiom 7 Band Sound Equalizer, Dual Channel Digital Equalizer, 12dB High Bass Adjustment, Output Input, 3.5mm Input Int CONTROL RANGE : 7-band equalization circuit control range ± 12dB, equalization bands: 60HZ, 150HZ, 400HZ, 1KHZ, 3KHZ, 6.Depisuta  NewDepisuta Stereo Digital Equalizer with Balance Volume Control, 3 Band Sound Equalizer, Car Audio Equalizer, EQ Preamp fo 【3 Band Equalizer】Experience superior sound control with our 3 band equalizer. It fits seamlessly into your setup, delivNumark  NewNumark NS4FX – 4-channel DJ Controller, Touch Jog Wheels with Display, Performance Pads and Effects, Booth and Main Outp Professional 4-deck/channel DJ controller for streaming and club DJs, with dedicated controls for each deck and 3-band EAUDIOBANK  NewAudiobank EQ7 1/2 Din 7 Band Car Audio Equalizer EQ w/Front, Rear/Frequency Adjustable /3 RCA Input for Portable Devices Seven equalization bands (50Hz, 125Hz, 315Hz, 750Hz, 2.2kHz, 6kHz, and 12kHz), each frequency is adjustable from -12 toGOVRN  New31 Bands Graphic Equalizer, Professional Sound System Equalizers, Audio Digital Equalizador for Stage Performance (Color This machine adopts new DSP digital processor technology, which is used for processing of digital analog integration comCaline  NewCaline USA, CP-24 10-Band EQ equalizer Guitar Effects pedal 10-Band equalizer professional guitar pedal,gives players huge amounts of tone shaping and level controlTaramp's  NewTaramps EQ BASS Digital Audio for Control Your Bass Volume, with RCA Output/Input, Perfect Match The Output Signal Level NEGATIVE POWER TERMINAL: Use the shortest possible 1.5mm² cable, connected to the negative pole of the battery.21% Off Source Audio  NewSOURCE AUDIO ONE SERIES EQ 2 PEDAL SOURCE AUDIO ONE SERIES EQ 2 PEDALStetsom  NewStetsom Modular Central - SMC Remote Controller for Stetsom STX 2436 BT DSP Bluetooth Full Digital Signal Processor EQ P The SMC is a wired remote controller that allows you to view and change configurations in STETSOM products, such as theLine 6  NewLine 6 FBV Express MkII 4-button Foot Controller Hands free channel switching and more for your Line 6 amp and POD, 4 channel switches: A, B, C and DGeneric  New6 Band Eq Guitar Pedal Equalizer Effect Pedal for Electric Guitar Effect Pedal True Bypass Dc 9V and Battery Supported 6 🫐【True Bypass Design】: The true bypass design mizes tone loss, ensuring the best possible sound quali . Whether you'reSTRICH  NewSTRICH EQ Pedal for Electric Guitar,10-Band Equalizer Effects Pedal, Equalizer for Guitar and Bass, 10 Frequency Bands ( Premium Guitar / Bass EQ Pedal: Crafted from high-quality aluminum alloy for exceptional durability and artistic appeal.Hertz  NewHertz SPL Show S8 DSP Compact Digital Interface Processor 6 in + Digital in & 8 outputs S8 DSP is a distilled essence of technology at the service of the highest audio quality in a corrosion-free case cast inSHUAIGUO  NewEQ pedal,SHUAIGUO 10-Band EQ Guitar Effect Pedal Mini Guitar Equalizer with True Bypass for Guitar Bass Aluminum Alloy B Mini equalizer pedal with true bypass designed for guitar.briidea  NewBriidea Load Equalizer and Stabilizer Controller/Resistor Compatible with Harley Davidson Motorcycle, Led Turn Signals, ACHIEVE STABLE TURN SIGNAL PERFORMANCE: The load equalizer and stabilizer controller is designed to optimize the electriMEIRIYFA  NewMEIRIYFA Car Bass Volume Control Knob, Universal RCA Bass Amplifier Controller, Car Audio Gain Equalizer Regulator Frequ MEIRIYFA Car Bass Volume Control Knob utilizes one dual-channel RCA input and one dual-channel RCA output for easy operaMagiDeal  NewCar Audio Amplifier Equlizer Remote Level Bass Sound Volume Knob This remote amplifier level control is used to adjust an amplifier's power level, stereo, equalizer or crossover volumeGeneric  NewDaseeme 10-Band EQ Guitar Effect Pedal Mini Guitar Equalizer with True Bypass for Guitar Bass Aluminum Alloy Body - BAND Low power consumption t supply.Snnisttek  NewAcoustic 5-Band EQ Equalizer Guitar Preamp Piezo Pickup Tuner with LCD Display and Easy to Read Shape sound and eliminate feedback with 5 bands of equalization.Behringer  NewBehringer 305 EQ/MIXER/OUTPUT Legendary Analog Parametric EQ, Mixer and Output Module for Eurorack Combination of amazing parametric EQ, mixer/oscillator and headphone amplifier module from the early '80sBOSS Audio Systems  NewBOSS Audio EQ1208 4 Band Pre-Amp Half-DIN Car Equalizer, Subfoofer Output, Dual Color Illumination Half-DIN 4 Band Pre-Amp EQBHCASE  NewBHCASE 10-Band EQ Guitar Effect Pedal Mini Guitar Equalizer with True Bypass for Guitar Bass Aluminum Alloy Body - Band Mini equalizer pedal with true bypass designed for guitar.14% Off E-Lektron  NewE-lektron A28 DSP FX Studio Audio Mixer 6-Channel with Bluetooth USB Play Audio interface Compact audio mixer with options for 2 mono + 2 Stereo input channels, plus a minijack stereo input. Each mono channel hNew Rage Cycles  NewDual-Load Equalizer Dual-Load EqualizerGeneric  New10 Band EQ Mini Equalizer Effect Pedal Timbre Shaping for Guitar Bass Alloy Body [Elegant Design] Sleek alloy metal case with a matte finish exudes a technical and stylish feelTaramp's  NewTaramps Crx4 Electronic 4 Way Crossover RCA Channels 8 Volts Rms Car Audio Processor Stereo Equalizer Great for Low/High CompactLrocaoai  New4X 6S Active Equalizer Balancer Lifepo4 / Lipo/LTO Battery Energy Equalization Capacitor Board With under-voltage sleep protection, the voltage automatically stop entering the sleep state when the voltage is lower tMagiDeal  NewMagiDeal 7 Band Car Audio Equalizer DSP Chip Metal Intelligent Noise Reduce Frequency Adjustable Graphic Equalizer Car E 【Advanced 7 Band Equalization】: This car audio equalizer features 7 adjustable bands (50Hz, 125Hz, 315Hz, 750Hz, 2.2kHz,PreSonus  NewPresonus Faderport8 FADERPORT 8 8-Channel Mix Production Controller 8 touch-sensitive, 100 mm long-throw, motorized fadersBehringer  NewBehringer X-Touch Compact Universal Control Surface Universal Remote Control for DAWs, Instruments, Effects and Lighting applicationsEMSea  NewEMSea PWM DC Motor Speed Controller Module 12V 24V 36V 48V Adjustable Speed PWM Electronic Governor Controller Regulatio This DC motor speed controller uses PWM speed control technology (pulse width modulation), which is characterised by higBehringer  NewBehringer STUDIO M Premium Passive Studio Controller, Compatible with PC and Mac All-in-one master volume controller, source selector and monitor switcherBehringer  NewBehringer MONITOR1 Premium Passive Stereo Monitor and Volume Controller Premium passive stereo volume controller and attenuator