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dbx 131s Single Channel 31-Band Graphic Equalizer 

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When the pros need an EQ, they turn to dbx. With a proven track record that spans four decades, dbx EQs are the industry standard for touring, studio...Click To Read More About This Product

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Exceptional sound and rugged reliability.

When the pros need an EQ, they turn to dbx. With a proven track record that spans four decades, dbx EQs are the industry standard for touring, studios, and audio installations. With the dbx heritage of revered pro EQs, the 131s meets the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls.

The dbx 131s includes a single 31-band channel 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 110 dB dynamic range to the quality componentry and meticulous attention to detail, the 131s offers exceptional sound and rugged reliability that guarantees you will always sound your best.

Sure to find a home in the studio, on tour and with installed sound venues, the dbx 131s is destined to take its rightful place in the lineage of great dbx 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.

  • Single 31-band, 1/3-octave Constant Q frequency bands
  • Switchable boost/cut ranges of ±6 or ±12dB
  • 12dB per octave, 3dB down @ 50Hz low-cut filter
  • Front panel bypass switch
  • ±12 dB input gain range
  • 4-segment LED ladders for monitoring output levels
  • XLR and TRS Inputs and Outputs
  • Frequency Repsonse of 50kHz
  • Dynamic range of greater than 108dB

131s Single Channel 31-Band Graphic Equalizer

  • Input
    Connectors: 1/4" TRS, female XLR (pin 2 hot)
    Type: Electronically balanced/unbalanced, RF filtered
    Impedance: Balanced 40k ohm, unbalanced 20k ohm
    Max Input Level: >+21dBu balanced or unbalanced
    CMRR: >40dB, typically >55dB at 1kHz

    Connectors: 1/4" TRS, male XLR (pin 2 hot)
    Type: Impedance-balanaced/unbalanced, RF filtered
    Impedance: Balanced 100 ohm, unbalanced 50 ohm
    Max Output Level: >+21dBu balanced/unbalanced into 2k ohm or greater
    >+18dBm balanced/unbalanced (into 600 ohm)

    System Performance
    Bandwidth: 20Hz to 20kHz, +0.5/-1dB
    Frequency Response: <10Hz to >50kHz, +0.5/-3dB
    Dynamic Range: Typicall >112dB
    Signal-to-Noise: Typically >95dB
    THD+Noise: <0.003%
    Interchannel Crosstalk: <-90dB, 20Hz to 20kHz

    Function Switches
    EQ Bypass: Bypasses the graphic equalizer section in the signal path
    Low Cut: Activates the 50Hz 12dB/octave high-pass filter
    Range: Selects either +/- 6dB or +/- 12dB slider boost/cut range

    Power Supply
    Operating Voltage: 100VAC-240VAC 50/60Hz
    Power consumption: 15W
    Mains Connection: IEC receptacle

    Weight: 4.8 lbs. (2.17 kg) Shipping weight 6.2 lbs. (2.81 kg)
    Dimensions: 1.75" (4.44 cm) H x 6"(15.24 cm) D x 19" (48.26 cm) W

Review Snapshot

by PowerReviews
dbx131s Single Channel 31-Band Graphic Equalizer

(based on 2 reviews)

Ratings Distribution

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Reviewed by 2 customers

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(8 of 8 customers found this review helpful)


Great basic function EQ.

By Lee Mason

from North Carolina

Comments about dbx 131s Single Channel 31-Band Graphic Equalizer:

Overall I am happy and would recommend this equilizer to anyone looking for the basics. If you are going to be fiddling around with the sliders a lot or need to change the settings often this may not be the eq for you as you may wish to find one with presets like Alesis offers. But if you are going to set and forget or only adjust a little here and there this might be the one. I have owned dbx equipment before and have been satified so far in most every aspect.
Nice EQ with basic features. Its nothing terribly fancy but has what I need to get the job done. I use this equilizer for fine tuning my bass rig which is sort of overkill considering the number of bands, but I like the flexibility it lends in helping to shape your sound. It is also great for helping to get rid of muddy or boomy sound that you may sometimes have trouble with.
Well built piece of gear. Expect it to last me a long time. Controls are pretty solid, 31 sliders (20Hz to 20kHz) have a good quality feel about them with a center detent that clicks. My only gripe is that there is no power switch, but that is minor and I suspect most similar units don't have a power switch either. Has an XLR and TRS input / output, along with the following controls: bypass, low cut, and 6 / 12 dB modes of operations, input gain (-12 to 12dB). Also included is a clip LED and a basic LED level meter (-10 to +18dBu). It is also very quiet which I like very much and has good dynamic range. Specs are pretty good in general.
Good basic eq. Though there are fancier units out there, I think this unit is worth $160. If I have no trouble with it, it will be money well spent.

(2 of 2 customers found this review helpful)


Works Great

By Kap'n

from Ohio

About Me Experienced

Verified Buyer


  • Clear Sound
  • Easy To Use
  • Versatile


    Best Uses

    • Guitar
    • Performances

    Comments about dbx 131s Single Channel 31-Band Graphic Equalizer:

    This was a replacement for an older 31 band EQ. This went right into my rig and worked great right out of the box. Pro quality product, heavy duty and rack mountable. I would say give this a try. Love the 12db gain feature.

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