12 best pro graphic equalizers

• Package Includes: Rockville REQ20 19" Rack Mount Pro Dual 10 Band Graphic Equalizer EQ w/VU Meters, Rockville RCDR10B 10' Dual RCA to Dual RCA Pro Audio Cable 100% Copper
• Features Of REQ20: Dual 10 Band Graphic Equalizer (20 Bands Total), Frequency Response: 20Hz - 20KHz, Dual VU Meters Level Monitor, Blue LED on each Equalizer Slide Control, Stereo RCA Line Input, Stereo RCA Line Output
• Vacuum Fluorescent Display, Bass/Midrange/High EQ Controls, Separate Left/Right Channel Volume gain control, Signal to Noise Ratio: >88dB, Input Power: AC ~ 110V 60H/220V 50Hz, 110/220V Switchable, Front Panel Power Switch, Removable Rack Mount Brackets, Dimensions: 17"(19" w/brackets) x 9" x 2.2", Weight: 5 lbs
• Features of RCDR10B: Rockville RCDR10B Black Dual Mono Right Angle RCA to Straight RCA Patch Cable, Dual RCA to Dual RCA, Nickel-Plated for Rugged Durability and Efficient Signal Transfer, 100% Copper Conductors for Enhanced Signal Clarity, OFC Spiral Shields for Effective EMI and RFI Rejection and Flexibility, Length: 10 Ft, Color: Black

User questions & answers

Question:	Will this work with denon avr 2112ci receiver
Answer:	Yes you can. I only use 2 channel receivers. Not into cinema and avr receivers. I use an external audio source selector. Available on Amazon. Mine handles 3 sources. But selectors with more source inputs are available. I run my sources to the inputs on the selector. Then run the single output to the auxiliary input or in the case of newer receivers, input 1,2 or 3. For my application it works very well. Technically you can connect this eq to your Denon or any other receiver without the in out loop.
Question:	what would cause this to make an awfull hissing sound ? right now its useless
Answer:	Trying to diagnose sound equipment is not always easy. A hum usually means a bad ground. A his could be a lose connection or a bad cable. First see if the noise is on both sides or just one. Single side noise try changing a cable from the left to the right to see if the hiss changes sides. If it does change does change out the cable. If the his stays then you have a speaker problem. If the his is on both sides check your ground. Hope this helps.
Question:	Can I connect this to a yaqin mc-13s
Answer:	You should beable to if u use aux cables for it
Question:	Can it be connected straight to a 200 watt am/fm home reciever
Answer:	Yes it will work very good with all types of recievers And 200 watts that's enuff to do alittle bit on thumppin I also have 200 watt receiver and with ROCKVILLE SOUNDS EVEN GREAT DEPENDED ON UR SPEAKER SIZE I HAVE 2 15 AND 2 SURRENDER NICE

Product features

Rockville REQ20 19" Pro Rack Mount Dual 10-Band Graphic Equalizer EQ+VU Meters

Package Includes:

• Rockville REQ20 19" Rack Mount Pro Dual 10 Band Graphic Equalizer EQ w/VU Meters
• Rockville RCDR10B 10' Dual RCA to Dual RCA Pro Audio Cable 100% Copper

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Features of REQ20:

• REQ20: Dual 10 Band Graphic Equalizer
• Dual 10 Band Graphic Equalizer (20 Bands Total)
• Frequency Response: 20Hz - 20KHz
• Dual VU Meters Level Monitor
• Blue LED on each Equalizer Slide Control
• Stereo RCA Line Input
• Stereo RCA Line Output
• Stereo RCA Line Output for Record
• Vacuum Fluorescent Display
• Bass/Midrange/High EQ Controls
• Separate Left/Right Channel Volume gain control
• Signal to Noise Ratio: >88dB
• Input Power: AC ~ 110V 60H/220V 50Hz
• 110/220V Switchable
• Front Panel Power Switch
• Removable Rack Mount Brackets
• Dimensions: 17"(19" w/brackets)  x 9" x 2.2"
• Weight: 5 lbs

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Features of RCDR10B:

• Rockville RCDR10B Black Dual Mono Right Angle RCA to Straight RCA Patch Cable
• Dual RCA to Dual RCA
• Nickel-Plated for Rugged Durability and Efficient Signal Transfer
• 100% Copper Conductors for Enhanced Signal Clarity
• OFC Spiral Shields for Effective EMI and RFI Rejection and Flexibility
• Length: 10 Ft
• Color: Black

Product description

Professional audio engineers have known for decades that a good EQ makes all the difference in how a performance is perceived. Although multi-band graphic equalizers have been around for a long time, they have changed very little... until now! The ULTRAGRAPH PRO FBQ3102HD takes the graphic equalizer into the realm of high-definition audio, providing robust features and Behringer proprietary FBQ Feedback Detection System - at a price that makes them a must-have for anyone who records or operates a live sound system. Professional 31-band stereo graphic equalizer for live and studio applications Revolutionary FBQ Feedback Detection system instantly reveals critical frequencies and can also be used as audio analyzer Ultra-low noise 4580 operational amplifiers for highest signal integrity Dedicated mono subwoofer output with adjustable crossover frequency Additional sweepable high and low-cut filters for each channel remove unwanted frequencies, e.g. floor rumble, hiss etc. Highly accurate 12-segment LED input/output metering and input gain controls for easy level setting Relay-controlled hard-bypass with an auto-bypass function during power failure (fail-safe relay) Servo-balanced inputs and outputs with 1/4" TRS and gold-plated XLR connectors Planet Earth switching power supply for maximum flexibility (100 - 240 V approx.), noise-free audio, superior transient response plus low power consumption for energy savingLess Than

User questions & answers

Question:	Can you use this product for home audio
Answer:	For home audio you will need to buy XLR to RCA adapters.

Product description

The flagship of the entire FBQ series, the ULTRAGRAPH PRO FBQ6200 is an ultra-musical 31-band stereo graphic equalizer that goes the distance to offer a maximum in performance and flexibility in both live and studio applications. Start with the forward-looking, patent-pending FBQ Feedback Detection System that instantly reveals feedback frequencies and also can be used as an audio analyzer. A whole battery of superb features makes the FBQ6200 score high on the ease-of-use scale: dedicated limiters with gain reduction meters for each channel protect your sound system from overload and distortion, and a pink noise generator provides test signals for equalizing your sound system to any room acoustics. A mono subwoofer output with dedicated level control and adjustable crossover frequency gives your music some extra verve.

The flagship of the entire FBQ series. Click to enlarge.

Sweepable high and low cut filters, highly accurate 8-digit LED input/output metering and input gain control.

Built-in limiters and noise generator.

Additional sweepable high and low cut filters for each channel remove unwanted frequencies such as floor rumble and tape hiss. Level setting is no sweat thanks to the highly accurate 8-digit LED input/output metering and input gain control. Top-drawer components such as the ultra low-noise audio operational amplifiers, servo balanced inputs and outputs with 1/4" TRS and gold-plated XLR connectors and the relay-controlled hard-bypass with an auto-bypass function offer outstanding audio performance.

Expect reliability in the long run with the high-quality illuminated 45-mm faders, detent potentiometers and illuminated switches. Any way you look at it, the FBQ6200 has all the right stuff to become a welcome addition to your touring rack.

FBQ Feedback Detection System

The FBQ Feedback Detection System is one of the most outstanding characteristcs of Behringer's graphic equalizers. This ingenious circuitry lets you immediately recognize and eliminate feedback frequencies. The FBQ Feedback Detection System uses the LEDs in the frequency band faders to indicate the critical frequencies. This way, what once used to be a labor-intensive search for feedback frequencies is now an activity that even a child could master.

In normal operation, the fader LEDs indicate frequency ranges with the highest energy levels, therefore replacing a separate audio analyzer. If you keep an eye on the LEDs while you play back your music (or during the sound check before a show), you can easily identify those frequency ranges showing the highest energy levels. Similarly, increased signal levels on individual frequency bands indicate a higher likelihood that feedback may occur.

Relay-Controlled Hard Bypass

The so-called hard bypass relays were integrated into the development concept of the FBQ6200 and the FBQ3102. These relays assure that your equalizer is automatically switched into bypass mode in the event of loss of power or faulty power delivery. These fail-safe relays also produce a slight delay during powering up in order to avoid dangerous switch-on thumps.

Balanced Inputs and Outputs

The BEHRINGER ULTRAGRAPH PRO models feature electronic servo-balanced inputs and outputs. The servo function performs automatically, recognizing when unbalanced signals are connected and internally converts the nominal signal level so that no signal level difference between input and output signals occurs (6 dB correction).

Future-Oriented Behringer Technology

To assure the highest possible degree of usability, all Behringer's equipment is manufactured adhering to the highest quality standards in the audio industry, under ISO9000 certified management system.

What's in the Box

Behringer FBQ6200 31-Band Stereo Graphic Equalizer, Power Cable, User's Manual

• Professional 31-band stereo Graphic Equalizer for both live and studio applications
• Revolutionary FBQ Feedback Detection System instantly reveals critical frequencies and can also be used as Audio Analyzer
• Dedicated limiters with gain reduction meters for each channel protect your sound system from overload and distortion
• Pink noise generator provides test signals for equalizing your sound system to any room acoustics
• Highly accurate 8-digit LED input/output metering and input gain control for easy level setting

User questions & answers

Question:	These equalizer i use in home o in the car
Answer:	Best application is semi-pro or home use. It can be used in a vehicle but you MUST provide a proper power source. In the U.S., that would be 120 Volts AC, 60 Hertz. Inverters are available that could be used for this application. It is also possible to redesign the internal power supply if this is a permanent vehicle installation. This degree of modification is called re-engineering and you have to have quite a bit of expertise in electronics to do it. Also keep in mind this EQ was not designed for the harsh environment of a vehicle..... hot, cold, humidity, vibration, etc.
Question:	Can i use this equalizer with my audio sound system
Answer:	Also it is not ballanced which means if there are multi amps you have to make sure they are all at equal volume
Question:	can you connect a 4 channel power amp to this eq
Answer:	Hi Richard,I use the Behringer FBQ6200 for both studio and live applications. this EQ is designed for 3 outputs (right, left and sub). However, there are many ways to accomplish what you want. The answer is yes. What I have done is use channels 1 and 2 for mains (R and L) and used a Y splitter on the sub-out and connect them channels 3 and 4 (mono subs) but the over all sound of the kik and bass guitar is amazing.I have included a link to the EQ's manual. Have fun. http://www.behringer.com/assets/FBQ6200_FBQ3102_FBQ1502_M_EN.pdfSir Julio - SirReale Productions - Santa Rosa, CA
Question:	Is this made in USA
Answer:	This is made in germany.

Product description

In the world of audio engineers, club sound designers and professional grade home theater systems EQ’s are one of the most priceless pieces of gear you have at your disposal. No matter where you are or what room you may be in the frequencies of music will vary depending on the architecture of the room set up. Finding the right sound or that "Sweet Spot" is where a professional EQ will come into play. Technical Pro’s EQ7153 dual 21 Band Professional EQ was designed with exactly this in mind. Their superior design and quality parts once again sets this EQ apart from the rest! The ABILITY TO ADJUST 21 BANDS OF FREQUENCIES is a sound designer’s dream come true! This unit will give you so much control over your sound that after you integrate it into your studio, mobile rig or venue you will wonder how you ever survived without it! The EQ7153 is built with superior parts and will hold up under very tough conditions. This unit will work for a mobile rig or in the studio. The removable rack mountable brackets will allow you to fit it into any standard rack. You can connect up to 4 sources using the RCA inputs. Connect such sources as a CD player, DVD player audio, tuner etc. An additional input is available for an iPod, iPhone or MP3 player. Connect your iPhone or iPod by using the MP3 input and play your songs through this system! The outputs consist of an RCA record and main out which can easily be integrated into any sound system.

• Dual 21 band equalizer with individual LED indicators - Inputs: RCA (4 audio sources), MP3 (1/8'')
• Outputs: RCA (record, main) - Frequency response: 20Hz-20kHz - Equalizations Points: 32Hz, 63Hz, 100Hz+, 1kHz, 2kHz, 4kHz, 6kHz, 8kHz, 10kHz+
• Adjustment Range: ±12dB - Fluorescent spectrum display - Direct / Equalizer function allows option of unfiltered pass-through
• Bass booster increases the low frequency levels - Loudness booster increases the low and high frequency levels
• Removable rack-mount brackets - Dimensions (L x W x H): 19'' x 5.75'' x 3.75''

User questions & answers

Question:	Is there any way to din or turn off the led lights on the levers? they are blinding
Answer:	Get some acrylic model paint ( black or color of your choice) get a fine tip brush. Turn the eq upright ( knobs up ) place a small dab of paint on each light, let dry and make another pass. This will help deaden the glare.
Question:	Can i use a wire to ground the unit to my reciever to remove the hiss
Answer:	You could try. It is also possible the noise is coming from a component connected to your EQ. My EQ makes no audible sound, with all but two inputs being used, and no ground. Good Luck !
Question:	I have a sherwood rx 4105 am/fm stereo receiver and a teac cd-p650 compact disc player.will these hook up with this equilizer
Answer:	Yes
Question:	Is this 220 volts
Answer:	No, it's 110 volts. I'm really disappointed with mine. The blue led lights on the sliders are bright enough to light up the room. Also not happy with the performance.

Product description

8 Microphone inputs Recording capabilities Built-in dual 10-band equalizer USB/SD inputs Digital display Playback controls Built-in cooling fan

• Built-in Cooling Fan
• Built-in Dual 10-band Equalizer
• Recording Capabilities
• 8 Microphone Inputs

User questions & answers

Question:	This is made in China
Answer:	Hi, I don't know where its made. I suggest calling the dealer or manufacture. I do know I returned mine because of defects!
Question:	can i get a remote for it
Answer:	From my research about the unit-no. However I did not ask the manufacture. Try contacting them to see. Hope that helps-Stan
Question:	Can i connect 2 passive 500watts boxes on side a and a passive 800 watts on side b and will it push everything to the limits
Answer:	Sorry, that I do not know and further, I returned mine due to problems. I would call the manufacture on that one.
Question:	Can u put a music sd in it
Answer:	Hi, I returned mine, it did not perform correctly and there was sd slot in it-

Product description

The Rockville REQ231 is an extremely high quality professional rack mountable equalizer. This is a 2 channel equalizer with 31 bands per channel. The main focus on this was sound quality and making it rugged and tough. We wanted to build a professional product that will instantly make a good speaker sound better, and after months of testing we know we did it!



This graphic EQ also has a low cut crossover filter switch, with status LED, that helps remove rumble from mics. Another great feature is the bypass switch, with LED indicator, which is very convenient when doing sound checks.



We added a sub output with frequency controls which is something that we see a need for. Many brands for some odd reason do not give you a sub output and sub controls. We made sure to include this important function.



If you want the best sounding EQ on the market at a great price, then we highly recommend you try out our REQ231. If you are unsatisfied with the quality we will give you a 90 day money back guarantee including return shipping!



Features:



Rockville REQ231 Dual 31 Band 1/3 Octave Graphic Equalizer With Sub-Output

Dual channel (31 bands per channel)

Variable stage low and high cut filters

1/3 octave filter sets (ISO centers)

20 Hz to 20 kHz effective equalization range

Constant Q filters

Selectable 6dB or 12dB cut or boost range

Output level LEDs (-10 to +17 dB)

Bypass switch with status LED

Balanced XLR input/output

Subwoofer out

Channels: 2 (stereo)

Connectors: XLR balanced inputs and outputs

Bands: 31 per channel

• Rockville REQ231 Dual 31 Band 1/3 Octave Graphic Equalizer With Sub-Output. Dual channel (31 bands per channel). Variable stage low and high cut filters.
• 1/3 octave filter sets (ISO centers). 20 Hz to 20 kHz effective equalization range. Constant Q filters. Selectable 6dB or 12dB cut or boost range. Output level LEDs (-10 to +17 dB).
• Bypass switch with status LED. Balanced XLR input/output. Subwoofer out. Channels: 2 (stereo). Connectors: XLR balanced inputs and outputs. Bands: 31 per channel.
• Frequency Centers: 20 Hz, 25 Hz, 31.5 Hz, 40 Hz, 50 Hz, 63 Hz, 80 Hz, 100 Hz, 125 Hz, 160 Hz, 200 Hz, 250 Hz, 315 Hz, 400 Hz, 500 Hz, 630 Hz, 800 Hz, 1 kHz, 1.25 kHz, 1.5 kHz, 2 kHz, 2.5 kHz
• Control Range: Selectable +/-12dB 0r +/-6dB. Input Impedance: 50k ohms. Output Impedance: 600 ohms. Maximum Output Level: +21dBLevel Control: +/- 10 dB. Signal to Noise: >93 dB. Distortion: 0.005%.

User questions & answers

Question:	Can i connect speakers to the equilizer
Answer:	Mixer to eq then eq to powered speakers or mixer to eq then eq to amp then amp to unpowered speakers
Question:	can this EQ to subwoofer
Answer:	Its good i hve 1 single channel but it qorks great..
Question:	Would this work to boost the bass up a good bit in my home 2 channel stereo? I like a lot of bass without a subwoofer
Answer:	As any equalizer it is just going to help arrange the different frequencies. If you want more bass you should get a subwoofer. What an eq does is re-arrange what power is already there. You could make it sound more bassy by turning down the higher frequencies but that's working backwards. If you want more bass I would suggest using the money to buy a more powerful amplifier. (Or again getting a subwoofer)
Question:	Is the output for each channel stereo or mono
Answer:	Mono per side. Use both channel for stereo. For few bucks extra I suggest you to get Behringer EQ instead. Amazon always have great price for those EQ.

Product features

Rockville REQ231 Dual 31 Band 1/3 Octave Graphic Equalizer With Sub-Output

The Rockville REQ231 is an extremely high quality professional rack mountable equalizer. This is a 2 channel equalizer with 31 bands per channel. The main focus on this was sound quality and making it rugged and tough. We wanted to build a professional product that will instantly make a good speaker sound better, and after months of testing we know we did it!

This graphic EQ also has a low cut crossover filter switch, with status LED, that helps remove rumble from mics. Another great feature is the bypass switch, with LED indicator, which is very convenient when doing sound checks.

We added a sub output with frequency controls which is something that we see a need for. Many brands for some odd reason do not give you a sub output and sub controls. We made sure to include this important function.

If you want the best sounding EQ on the market at a great price, then we highly recommend you try out our REQ231. If you are unsatisfied with the quality we will give you a 90 day money back guarantee including return shipping!

Features:

Product description

The Model 355 Dual 31-Band 1/3 Octave Graphic Equalizer may be used in a variety of applications such as live sound, recording studios, instrument racks, DJ sound systems and fixed equipment installations. Designed to interface into any audio system, the Model 355 is a powerful tool for solving audio problems and creating interesting sound textures. The Model 355 possesses a long list of impressive features including: constant Q circuitry, 20mm center detent sliders (with a selectable boost/cut range of 6dB or 12dB), balanced XLR and 1/4? and unbalanced RCA input and output connections, adjustable high pass and low pass filters, variable input level controls, signal clip level indicators, ground lift switch, internal power supply and selectable line voltage switch. The rugged, all-steel constructed chassis occupies 2U rack spaces and is intended for installation into standard 19? equipment racks. The 355 Dual Channel 31 Band EQ has the features and performance you need for any of your audio applications requiring precise equalization. Dimensions: 3.5?H x 19? W x 8.5? D Weight: 9.0lbs. (4.1kg) Frequency Bands: 31, 1/3 octave, ISO spacing Filter Type: Constant Q - 3% center accuracy Slider Travel: 20mm w/ positive center detent Range: +/-6dB or +/-12dB selectable High Pass Filter: 10Hz to 250Hz, 12dB/oct Low Pass Filter: 3kHz to 40kHz, 12dB/oct Input Connections: Active balanced XLR and 1/4? TRS {XLR pin 2, 1/4? tip = Hot (+)} Unbalanced RCA ...

• Constant Q circuitry 20mm center detent sliders Selectable boost/cut range of 6dB or 12dB Balanced XLR and 1/4" Unbalanced RCA input and output connections Adjustable high-pass and low-pass filters Variable input level controls Signal clip level indicators Ground lift switch Internal power supply Selectable line voltage switch Rugged, all-steel chassis 2U rackspace required

User questions & answers

Question:	does it have 48v phantom for both XLR mic inputs
Answer:	No.
Question:	I have read this unit takes two racks spaces, albeit it states above it is 5.9 inches, so which is it? Thank you
Answer:	Just measured, the height is 3.5 inches.
Question:	Is this true?...i have been told that i cannot connect this to a onkyo 737 home theatre receiver because it does not have a tape loop
Answer:	Hi Steve. I looked up the Onkyo 737 so I could answer your question intelligently. I need to know how you want to use the EQ before I an give you a good answer. You could use the Zone 2 output to feed the EQ input and then connect the EQ output to another source input, say if you own a tape deck and you want to equalize the response, but I do not see the traditional "tape loop" that would enable you to equalize the front two channels irregardless of which source you pick. So the simple answer is no you can't use it effectively. Sorry.
Question:	whay are the in put / out put in each channel are crossing? like. rca has in put and out put on same channel
Answer:	RCA is unbalanced, meaning its susceptible to noise problems. XLR (and 1/4 trs - not 1/4 tr) are balanced, and more immune to noise problems picked up in interconnecting audio equipment. Balanced connections use shielded, twisted-pair cable and three-conductor connectors (like XLR or TRS connectors). This noise cancellation is called “Common Mode Rejection.” It's also good for long cable runs. And so XLR and TRS cables are used to transmit balanced audio from one balanced device to another. In an audio rack you might be tempted to use an inexpensive cable like RCA because the cable runs are short. That's your choice, but the professionals use XLR cables for the cleanest sound they can engineer.

Product description

When the pros need an EQ, they turn to db. With a proven track record that spans four decades, dB EQs are the industry standard for touring, studios, and audio installations. With the db. heritage of revered Pro EQs, the 231s meets the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls. The db. 231s includes two 31-band channels of 1/3-octave equalization, 12 dB input gain, switchable 6 dB or 12 dB boost/cut range, 20mm nonconductive sliders, an intuitive user interface, and output level metering. From its extended 10Hz to 50kHz frequency response and 112 dB dynamic range to the quality componentry and meticulous attention to detail, The 231s offers exceptional sound and rugged reliability that s you will always sound your best. Sure to find a home in the studio, on tour and with installed sound venues, The db. 231s is destined to take its rightful place in the lineage of great dB signal processors that are the professional's choice in signal processing. With such affordable quality, There's no longer any excuse for compromising your sound.

• Dual 31-band, 1/3-octave constant Q frequency bands
• Switchable boost/cut ranges of 6 or 12 dB
• Front panel bypass switch
• 12 dB input gain range
• 4-Segment LED ladders for monitoring output levels
• Inputs: ¼” TRS and female XLR (pin 2 Hot)
• Outputs: ¼” TRS and male XLR (pin 2 Hot)

User questions & answers

Question:	Can the rack "ears" be cut off ? I have a very strict width limit
Answer:	Any ears can be cut off, but I would be very careful. If you damage the corners, the integrity of the cabinet is gone.
Question:	If using xlr to rca connector will it make noise
Answer:	rca connectors are typically noisy on any application.
Question:	Does this amp have low frequency’s for body shaking bass
Answer:	It is not an amp. You will need an amp between this and your speakers. This adjusts the bass thru treble in 31 frequency bands from 10-20K HZ. I'd suggest Googling graphic equalizer if you are not sure!
Question:	Can it be used in a car
Answer:	At 19" wide and several inches deep, requiring a/c power, I can't envision a situation where it would be practical to use this product in a car. Also, electrical noise from car electronics would be a factor.

Product features

dbx 231s Graphic EQ

When the pros need an EQ, they turn to dbx. The dbx 215s includes two 15-band channels of 2/3-octave equalization, ±12 dB input gain, switchable ±6 dB or ±12 dB boost/cut range, 20mm nonconductive sliders, an intuitive user interface, and output level metering. From its extended frequency response and dynamic range, to the quality componentry and meticulous attention to detail, the 215s offers exceptional sound and rugged reliability that guarantees you will always sound your best.

Product description

The HQ231 Dual 31-band Graphic EQ is perfect for any live sound application where there is a high feedback potential including monitor mixes, side-fill cabinets or high powered front-of-house mixes situations. The HQ231 features ARTs proprietary FDC Feedback Detection Circuit, with constant Q circuitry capable of delivering a 3 center frequency accuracy. Professional features like LED level metering, selectable 6dB or 12dB slider range, active balanced and unbalanced input output connectors, RFI filters, independent variable Hi Pass low cut and Low Pass high cut filters, variable input level control, passive bypass switch, clip level indicator, ground lift switch, and selectable line voltage switch make it ideal for any professional application or touring system. FDC Feedback Detection Circuit - FDC Feedback Detection Circuitry designed and developed by ART Engineering instantly illuminates an LED on the corresponding EQ band fader with the greatest sustained signal. The LED indicators can immediately show which band corresponds to the feedback frequency, allowing the sound engineer to reduce gain in that band to quickly kill the feedback while having a minimal impact on the sound of the live program material. The FDC also acts as a simple spectrum viewer while the concert proceeds showing where the hot areas are. During system setup and sound check, the FDC may be used to help identify room and sound system resonances. By increasing the gain until feedback, it is easy to identify those frequencies that are likely to be problems. Reducing the gain in these bands helps tune the sound system, and, remove problem areas before the show begins. It also helps increase the gain margin before feedback.

• FDC Feedback Detection Circuit.
• Dual Channel 31-Band Graphic Equalizer.
• Output Level VU Metering on Each Channel.
• Constant-Q Filtering.
• Individual High and Low Pass Filters on Each Channel.

User questions & answers

Question:	is this a octive eq? can the lights be placed on non flickering
Answer:	The fencing I received is black.
Question:	what kind of inputs and outputs does it have
Answer:	yes, there are 5 pieces at 13" each which makes 65" total
Question:	is the face blue or black
Answer:	5 feet only
Question:	Do the sliders light up red? or no? whats the diff between this and the 355? version
Answer:	Just put the stakes down for one part and only one stake down for the other so that it would swing with the hinge used as a gate.

Product description

Nady A-B Box (GEQ-215)

• Active balanced XLR, 1/4" TRS and unbalanced RCA inputs and outputs
• Constant Q bandwidth from each filter with 3% frequency accuracy
• Parallel filter design for minimal phase distortion

User questions & answers

Question:	are the sliders lighted
Answer:	No, this is a single channel equalizer, if you bought 2, one for each channel it would work. But there is a better answer, the ART 341 is dual channel for stereo systems. However it comes with 15 band per channel, 2/3s octave. Better function in my estimation. And provided you have RCA input, mini-plug or 3 prong connections on your amp, going from CD to amp to eq to speakers is easy. This eq is by far the most versatile of the ART eqs.
Question:	Can it be used on 220v
Answer:	YES
Question:	is this for cars or home stereo
Answer:	Cables are not included. Cost depends on brand.

Product description

Professional Dual 15-Band Stereo Graphic Digital Equalizer 19" Rack Mount / Input Gain ***BRAND NEW -- NEVER USED*** Very high quality Professional Dual 15-Band Equalizer with Crystal Clear Sound quality MUSYSIC MU-EQ15B One Year Limited Manufacturer Warranty in USA The MUSYSIC MU-EQ15B is a professional Equalizer at your disposal is priceless and can make or break your overall sound! MUSYSIC’s MU-EQ15B Dual 15-Band Professional Equalizer was designed with exactly this in mind. This is a professional Equalizer system that can be used to adjust your overall sound to a professional level!

• Digital Stereo dual 15-band graphic equalizer /
• Two Audio Source Line Input / 1/4" & XLR line input sources / 1/4" & XLR line output source
• Low Cut, Range +/- 12, ByPass, Clip / Input Gain control / Low noise circuitry
• 19" Rack Mount

User questions & answers

Question:	Can this unit be used with a home stereo receiver using 1/4" to rca adapter cords
Answer:	It's not an amp. It's a equalizer unit to fine tune music. This unit goes between the head unit and amplifier. Most head units provide 2 volt signal to the amp, this eq will provide 7 volt signal to the amp.
Question:	are the cables included with this EQ? If not, how much do they cost
Answer:	If I understand your question correctly then yes, it does have a plug to receive hi-level input from your stereo
Question:	I received a “three prong vertical” power cord but it does not fit into the back of the unit
Answer:	Yes each of the 31 bands represents an octave spanning 20Hz to 20kHz. Never tried to turn off the LEDs. They are not real bright but when they flicker it helps to locate the frequency of the feedback.
Question:	I want to know i put sound to equalizer than go to mixer or go to mixer than go to to equalizer
Answer:	The HQ231 has XLR, 1/4 TS, and RCA inputs for each channel.

Product description

The EQS755 is 1/2-DIN chassis Graphic EQ w/ built-in low-pass filter. Equipped with a full-featured 7-band Graphic equalizer, you will enjoy superior control over the audio spectrum with frequency adjustments in the 50 Hz to 16 kHz range over seven bands. This gives you the power to get the most of your sound system, and the ability to contour the sound output to your musical taste.

• 1/2-DIN chassis graphic equalizer with built-in low-pass filter6-channel/ 8-Volt RCA outputs (front, rear and subwoofer)7-ban graphic equalizer (50Hz, 125Hz, 315Hz, 750Hz, 2.2Khz, 6Khz, 16Khz)
• 3.5mm Front aux input2-channel RCA aux input with variable gain adjustments and high level speaker inputs
• Blue illuminationindependent master volume and subwoofer level Control with fader control select able 12Db low-pass Filer (60Hz or 90Hz)
• Ground loop isolation circuit Dimensions: 7"(w)x4-1/4"(l)x1"(h)

User questions & answers

Question:	What size are the screws
Answer:	Do not know. But it is well made and probably not need of repair for a long while to come.
Question:	Can you hook this up to subwoofer and door speakers? Got 3000watt ssl evo amp and 2500watt audiotek for doors. Please help
Answer:	Yes ,I guess so
Question:	does this amp remove distorcion and make speakers louder
Answer:	Yes it's a 2 channel equalizer
Question:	Does this double as a line converter for factory sterols without RCA outputs
Answer:	I ordered these twice and got 5 pieces with each order