dbx 131s 31-band Graphic Equalizer Certified Open Box

Name: dbx 131s 31-band Graphic Equalizer
Brand: dbx
Rating: 4 (5 reviews)

Single-channel 31-band Equalizer

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Item ID: 131Sd3

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This returned item is in like-new condition and perfect working order. Includes all original accessories.This item ships in its original factory packaging.

This item was thoroughly inspected by our factory-authorized service team and is backed by Sweetwater's exclusive 2-year warranty. The images shown do not necessarily represent the condition of this particular item.

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The Benchmark of Live EQs

There's a reason many of today's top live sound professionals turn to dbx for live sound EQs. With dbx's impeccable history of making robust and reliable graphic EQs, they've become a standard in touring rigs and installed PA systems everywhere. The dbx 131s 31-band graphic equalizer lives up to the legacy - providing 1/3-octave Constant Q control beyond the audible frequency spectrum. Equipped with a switchable +/-6dB or +/-12dB and an internal toroidal transformer, the 131s gives you fine control and superb sound quality. And with over 108dB of dynamic range, you know your sound is in good hands when you trust it to the dbx 131s graphic EQ.

dbx 131s Single-channel 31-band Equalizer Features at a Glance:

1/3-octave Constant Q frequency bands
Switchable boost/cut ranges of +/-6 or +/-12dB
12dB/octave, 3dB down at 50Hz low-cut filter
Front panel bypass switch
+/-12dB input gain range
4-segment LED ladders for monitoring output level
XLR and TRS inputs and outputs
Internal toroidal transformer
Frequency response of <10Hz to >50kHz
Dynamic range of greater than 108dB
Weight: 4.8 lbs.
Dimensions: 1.75" x 6" x 19"

For precision control and quality sound, count on the dbx 131s 31-band graphic equalizer!

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At Sweetwater, we're so picky that what we call "Certified Open Box" is actually better than what most music retailers sell as "new" gear! Our gear hasn't endured hundreds of people a week plunking away at all the keyboards, fumbling through Stairway to Heaven on every guitar or playing with every fader and knob on a mixer or control surface.

Certified Open Box (also known as a demo) means we’ve had it out of the box for our YouTube channel, displayed at events, tested in our studio, or maybe it was in a customer’s hands for a few days and isn’t ‘factory fresh’ as a result. Every Certified Open Box item we sell has Sweetwater’s 2-year Total Confidence Coverage™ warranty and has been tested and verified up to ‘new’ specs by our factory-authorized technicians to make sure it’s in perfect working order before we ship it to you.

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Resources

From the Manufacturer

131s Spec Sheet

215s, 131s, and 231s User Manual

Signal Processing Buying Guide

EQ Frequencies of Musical Instruments Explained

Apr 6, 2025

Warranty Info

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Tech Specs

Number of Bands: 1 x 31-band
Q Type: Fixed
Boost/Cut Range: ±6 dB, ±12 dB (Switchable)
Low Cut Filter: 50Hz, 12 dB/octave
Faders Throw: Short-throw
Analog Inputs: 1 x XLR, 1 x 1/4"
Analog Outputs: 1 x XLR, 1 x 1/4"
Rack Spaces: 1U
Power Source: Standard IEC AC cable
Height: 1.75"
Width: 19"
Depth: 6"
Weight: 4.8 lbs.
Manufacturer Part Number: DBX131SV

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Don't doubt the power of American made audio equipment! Gets straight to the point.

Great EQ , easy to set up works great

Very nice piece of gear. Straight forward and easy to operate. Instruction do not include all functions of the unit and there is no off/on switch. From a functional point of view I'd give it an A

If your thinking of purchasing this gear there's two things you need to be aware off... First, When you buy this please make sure you have or go purchase you some Balanced connections. When I say "Balance Connections" I mean Balanced Connections on both ends or you gonna end up pulling out your hair trying to figure out why your signal is so low or not playing at all. Secondly, this gear DOES NOT have a power switch, REPEAT no power switch, it will turn off when you either unplug it or turn off your power conditioner like me. The sound quality is "Okay" I heard better thou.

Sweetwater proved it again that they are the place to buy gear. The first unit was defective but Sweetwater made the replacement very easy. DBX is not the company of the past. The unit is somewhat noisy as compared to my older gear. But it is still in the acceptable range for live performances but not for recording.

See also: Graphic Equalizers, dbx, dbx Graphic EQ