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    Monoprice Dual 31-Band Graphic Equalizer with Sub Out
    Product # 615031
    In Stock This item should ship today (10/16/2018) if ordered within 9 hours 7 minutes

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    Model 615031
    Type 2x 31-band, 1/3 octave
    Rack Spacing 2U
    Slider Travel 20mm with positive center detent
    Range ±6dB or ±15dB selectable
    Input Connections Active balanced XLR and 1/4" TRS
    Unbalanced RCA
    Input Impedance 20kΩ (balanced)
    15kΩ unbalanced
    Maximum Input Level 14dBu
    Output Connections Active balanced XLR and 1/4" TRS
    Unbalanced RCA
    Subwoofer Output Active balanced XLR
    Frequency: 50 ~ 250 Hz
    Output Impedance < 600Ω
    High Pass Filter 40 Hz (12dB/octave)
    Low Pass Filter 16 kHz (12dB/octave)
    Frequency Response 20 Hz ~ 50 kHz (-1.5dBu)
    Total Harmonic Distortion < 0.01% (@ 1kHz, all VR at 0dB)
    Signal-to-Noise Ratio > 110dB
    Power Source 95 ~ 120 VAC, 60 Hz
    220 ~ 240 VAC, 50/60 Hz
    Power Consumption 18 watts (maximum)
    Dimensions 19.0" x 8.7" x 3.5" (483 x 220 x 88 mm)

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    Browse 4 questions Browse 4 questions and 15 answers
    Are the rack mount ears removable?
    New User U on Apr 7, 2018
    BEST ANSWER: No. It has a full width (19") face plate. No "ears" to remove. It does include 4 "feet" that can be added to the bottom for stacking though. I'm happy with mine for the price, but I hate that bright blue power light. Black tape fixed that though. :P
    Is this equalizer appropriate for playing good, quality music on a vast home stereo setup?
    A shopper on Aug 14, 2017
    BEST ANSWER: I have a system that's worth about 30k high end everything I use it as a sub out for a stereo only system and it is the high pass filtee for my Magne pan 3.7i's and it does an amazing job, I bought it just for a laugh and it actually does well its funny I have cables and power cords that are worth 7x what the eq cost just for one cable and it is on par with any of the higher end eqs it's all about marketing but I put a logo over the monoprice logo so it don't look ghetto :-)
    I bought this and am completely confused why it does not have a standard rca connector for hooking up either of my subwoofers. The crappy manual is no help as it comes from a company that owes its success to cables yet does not tell mw what cable I should get to hook up my cheap old Klipsch subwoofers. Can someone please tell technically challenged old man exactly what cable to buy to connrct my sub, otherwise this is useless to me. Sorry to sound grumpy but if this is being sold as a home entertainment piece, it shoul not require expertise beyond standard hookup knowhow. Part number of apprpriate cable?
    James M on Aug 2, 2017
    BEST ANSWER: Thank you for your interest in this EQ. As this is a professional grade equalizer, the subwoofer out is XLR only. Please follow the link below to the XLR-RCA cable you will need. There are lengths up to 15'.
    Monoprice 6ft Premier Series XLR Female to RCA Male Cable, 16AWG (Gold Plated)
    Monoprice 6ft Premier Series XLR Female to RCA Male Cable, 16AWG (Gold Plated)
    what is the warranty of this equalizer?
    Abraham R on Jan 6, 2017
    BEST ANSWER: The Dual 31-band EQ has a 1-year warranty.
    4.4 / 5.0
    16 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Star
    Great Stereo EQ, for BASIC use, and SQ
    I'm going to rate this as a 9/10 because it does BASIC EQ functions very, very well. It lacks in some areas, especially compared to higher priced options with more features. However, as an actual stereo EQ, it does very well.

    Input and Output options are great. Rackmounting is great. Band peak frequencies are standard, and well chosen. Q values are good, overlap is fairly decent. Gain select (6db vs 13db) is useful. Input and output options are flexible. +/-6db preamp gain, that cuts to -infinity is adequate. Signal path is preserved when the unit is powered off (this is great). Unit consumes around 15w during operation and doesn't warm much to the touch. Half rack size is great for cable routing.

    There's a very decent power-on and off pop, so be careful if gains aren't set well. As mentioned, the subwoofer gain selector frequency is too high. The highpass and lowpass filters for the main stereo EQ are very weak (little filtering, range too narrow). LEDs are too bright (easily fixed).

    All facts considered, the EQ sounds great for the ~110$ price point. Injects no noise into the stream over XLR or TRS, flexible grounding and input/output options are helpful, good control (knob/slider) feel, good frequency points, good frequency overlap and slider Q width.

    I havn't found a similar sounding EQ for the same price. Behringer EQ models and ebay EQ models in the same price range don't compare, although they may have more features.

    PS: being able to drive dual 12" woofers tuned to 23hz, with +6db on the 20hz band is nearly life-changing.

    PROS: Floating Ground Option, and secondary ground point.

    XLR, TRS and Unbalanced RCA In and out.

    Separate Sub Channel out, that takes bridged input, no Y cables needed.

    20hz control for the low end is wonderful as a subsonic filter OR a bass booster depending on application.

    Decent subwoofer separation with variable lowpass.

    Low Power Consumption

    Nice controls, smooth actuation, nice knobs.

    CONS: Subwoofer frequency gain selector range is 50hz-250hz, is terrible. Most subs play below 50hz, should be able to Select gain to 30-ish hz.

    DECENT power-on and off pop noise injected to input. BE CAREFUL.

    LEDs are very bright.

    Highpass and Lowpass filter buttons on main channels are extremely weak. Very little filtering.
    November 30, 2015
    Dual 31 Band Equalizer
    I am using this in a home theater that uses separate outboard amps for all channels, except the Atmos speakers. I like to make the center channel have a bit of push in the vocal range to cut through all of the rest of the channels without overpowering them. This unit sounds fine, low noise, no distortion that I can hear, and does exactly what I need without a lot of "blinken lights" to distract the viewer.
    However, BE VERY CAREFUL about how you connect this unit! It has a signal ground connection that is tied to the house ground!
    If your receiver has only a 2 prong power cord, then you MUST use the ground lift switch on the back to remove that ground connection. It fried my center channel output on my Denon receiver within a few hours of operation. Also, it's a good idea to use an signal isolation transformer from the reciever to this unit as a further precaution. Get an isolator that can output a balanced signal to the equalizer, then to the amp if it has a balanced input, or use the RCA if unbalanced. This will also eliminate any ground loop noise that my be coming through.
    Now, this could be the fault of the Denon as it should be able to handle this kind of connection, but in my experience of over 40 years of sound installs, house grounds connected with units that do not have house grounds can cause all kinds of weird problems.
    FYI, I am not using the internal equalizer of the receiver for 2 main reasons: one, I have to disable the Audyssey 32 filters to use the internal EQ, and two, the internal EQ has very few bands to work with. The MONOPRICE unit has plenty of bands up in the vocal range to really precisely adjust the sound.
    So, in summary, always use an isolator/ground loop eliminator for external amps (this should be done anyway in all cases) if the
    source and or sink does not have any house ground connections, and use the ground lift switch on this unit as well.
    Other than that, if you need this kind EQ in your system, for the price, you can't beat this unit.
    January 4, 2017
    1 year ago
    nice eq, great value
    I won't rehash the pros, except that I'm very glad the EQ doesn't have to stay powered on to keep the in/out signal path alive! Even when it is powered on, there are bypass buttons that trip these relays if you choose. Sound is VERY clean. If you love the old school analog EQs for customizing your sound, this is an unbeatable value. I am not using the sub outs at this time.

    PROS: Balanced and RCA ins/outs for channels and sub

    Passive relays that keep the signal path alive even when the power is off

    Smooth action on the sliders, with a small slider parking notch at the 0db middle line

    Soft start on power ononly a barely audible tick is heard through the outputs

    CONS: None so far
    November 6, 2014
    A Quality EQ missing a few features
    The sound and adjustment are extremely good. The rotational pots feel marginal (maybe they should be anchored better, or higher quality parts should be used, but work great. The subwoofer low cutoff should go down to 20 hz.(It doesn't). There are some indicator LEDs, which give you a little information, but something more like an LED meter (or better yet a spectrum display) would really put this unit over the top. I haven't experienced the popping commented on in other reviews because I always turn the EQ on before I turn on my amp (it is just good practice), but if I had designed the unit the on/off switch would have a de-bounce circuit to resolve that issue.

    Despite the above minor flaws, the unit really has a quality sound to it and the sliders and adjustment are exceptional for a unit at this price point (I think it's exceptional at just about any price point actually). I'm using it with Marantz power amps and a turntable for a variety of musical types tailored just the way I like them. Better (sonically and from an adjustability perspective) than other EQs at twice the price.
    January 6, 2017
    1 year ago
    Monoprice 31 dual band equalizer
    I own Rane and DBX dual band equalizers that cost much more and then this unit and for me works in the same manner.
    The ability to tune frequency's is a real plus to having a proper performing system in both a home setting and a Pro audio setup. It will bring your systems alive.

    PROS: None

    CONS: To properly setup a 31 band EQ requires another piece of equipment, a Real Time Analyzer (RTA). This reads thru a calibrated microphone the level of each slider on the EQ. This is the only way to actually adjust a 31 band EQ. Hey Monoprice, how about producing an affordable RTA. :)
    October 28, 2016
    Model 615031 2X 31-band 1/3 octave Graphic Equalizer
    I received the equalizer last evening and did the unboxing and condition inspection. As usual, MONOPRICE had it well boxed and shipped quickly. Next came the interconnection into the stereo sound system. First impressions: 1) I very much like the understated use of LEDs - they are there where they need to be for operational information, but the thing doesn't glow like some others I've considered. It is not distracting at all! All the controls operate smoothly and correctly. 2) Operation is as expected - adds boost (or cut) up to 15db with 31 bands - as much frequency control as anyone could possibly want at a reasonable price!

    PROS: Pros: It does what it is supposed to do! So far, it is working flawlessly. It fits nicely into the system, especially if you are rack mounting. The price is amazing!

    CONS: Cons: I haven't found any as of yet. Thanks MONOPRICE!
    December 22, 2015
    Big Bang for Buck!
    Very impressed at this price point - using it (right now anyway) as a surrogate for a 1960-1970's original Bose 901 active speaker EQ - not using it with a subwoofer so I cannot comment on that aspect - but quiet, transparent, versatile :-)
    July 12, 2018
    4 months ago
    good product
    I used this only once so far in my home studio on vocals. It worked fine.
    May 17, 2018
    6 months ago
    Excellent EQ.
    The main reason I like the equalizer is for the sub out level and frequency controls. I just started to test the EQ and the upper frequency response is excellent but I haven't tried out the sub out yet. So far I would give it a thumbs up. The controls are very responsive and the front panel has a professional feel and look.
    July 15, 2018
    3 months ago
    Excellent EQ, especially for the price
    I use this to make in-room response more accurate--boost the bass and the midrange floor bass cancellation, also lower the treble in a fairly reflective room. It's very quiet and transparent--doesn't affect the quality of the sound in a good stereo (Tannoy speakers, tube amplifier), only the frequency response. I deducted one star because one circuit light was out when shipped--however, I flicked the ground switch a few times and it came on. Highly recommended.
    May 29, 2018
    5 months ago