Item# DBX2231V
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$529.95529.95 each
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You used to have to settle for second best in a reasonably priced EQ but not any more. With the new 20 Series from dbx® Professional Products you get a great EQ circuit, a graceful yet powerful limiter and the revolutionary new design of the Type III® Noise Reduction.
At a Glance:
  • Built-in dbx Type III® Noise Reduction
  • Patent-pending PeakPlus® Limiter
  • Four segment LED bargraph for both Gain Reduction and Output Level
What's in the Box:
  • 1 x dbx 2231 dual channel 31 band graphic equalizer
  • 1 x AC power cord
  • 1 x Operation manual
  • 1 x Registration card
  • 4 x Rack mount screws and washers
It's amazing. One little button. It has so much effect. The Type III® Noise Reduction is an entirely new concept... virtually instantaneous encode/decode within the circuitry of the box. We started out to build the finest EQ's possible, boxes with the heritage and performance to rival our famous 30 Series EQ's. And to no one's surprise they came out awfully darn good. (Ask to see the Audio Precision plots compared to the competition.) But then, Roger (our chief engineer, a nice guy, as far as engineers go) got the crazy idea of putting this new noise reduction stuff in the box. We listened to it and were amazed. The EQ's sounded great without it but with it the performance was nothing short of incredible. Check it out yourself and see. But hey, Roger wasn't about to stop there. PeakPlus™ Limiter. Who knows more about limiting than the folks at dbx®; nobody... that's who. So when the guys were developing this new series of EQ's they wanted something that would be unique to these EQ's. That's when Roger got another one of his bright ideas and said "I bet they'll work a lot better if there's a cool limiter built in." Next thing you know, all the guys are in the studio amazed at the new limiter Roger had designed specially for the 20 Series. Once again, hearing is believing... With a threshold range of 0 to +20dbu, the PeakPlus limiter is designed to tame your program material from the subtlest nuances to the rowdiest hits. Also, the four stage LED ladder gives you a great visual indication as to what the limiter is doing. 20 Series EQ's. You used to have to settle for second best in a reasonably priced EQ but not any more. With the new 20 Series from dbx® Professional Products you get a great EQ circuit, a graceful yet powerful limiter and the revolutionary new design of the Type III® Noise Reduction.
Product Features:
  • Revolutionary Type III Noise Reduction
    Access the 2231's incredible, built-in Type III circuit at the push of a button. It instantly encodes/decodes the signal and can increase signal to noise ratio by up to 20dB.
  • PeakPlus™ Limiter
    The 2231 features a patent-pending PeakPlus™ Limiter threshold range from 0dBu to +24dBu (off) that can transparently tame the wildest hits or the subtlest nuances of any signal.
  • Bypass switch
    Bypass the EQ with a simple press of the 2231's bypass switch that is conveniently located on the front panel.
  • ±15 dB input gain range
    The 2231 is capable of -15 dB to +15 dB of gain.
  • 4-segment LED bargraph for both the Gain Reduction and Output meters
    Easily determine the processing status of the 2231 via the front panel LEDs.
  • XLR and TRS Inputs and Outputs
    The 2231 has balanced inputs and outputs that can be used with any balanced or unbalanced line-level device.
  • Frequency Response of better than 10Hz to 50kHz, +0.5/-3dB
    The 2231 is able to easily respond and adjust for a speaker's frequency response based on its amazing 10 Hz to 50 kHz frequency response range.
  • Dynamic range of greater than 120dB, unweighted
    The 2231's wide dynamic range ensures clean, clear audio regardless of the audio content being processed.
Manuals & Downloads:
General Specifications:
Input Connectors
1/4" TRS, female XLR (pin 2 hot), and barrier terminal strip
20Hz to 20kHz, +/-0.5dB
Frequency Response
<10Hz to >50kHz, +0.5/-3dB
Signal-to-Noise (NR In
+/-6 and +/-15dB ranges)
Dynamic Range (NR In
+/-6dB and +/-15dB ranges)
Signal-to-Noise (NR Out
+/-6dB range)
Dynamic Range (NR Out
+/-6dB range)
Signal-to-Noise (NR Out
+/-15dB range)
Dynamic Range (NR Out
+/-15dB range)
<0.04%, 0.02% typical at +4dBu, 1kHz
Interchannel Crosstalk
<-80dB, 20Hz to 20kHz
Noise Reduction
Up to 20dB of dynamic broadband noise reduction
NR Switch
Activates dbx Type III Noise Reduction
Bypass Switch
Bypasses the graphic equalizer section in the signal path
Low cut Switch
(recessed) Activates the 40Hz 18dB/octave Bessel high-pass filter
Range Switch
(recessed) Selects either +/- 6dB or +/- 15dB slider boost/cut range
I/O Meter
4-LED bar graph (Green, Green, Yellow, Red) at -10, 0, +10, and +18dBu
Gain Reduction Meter
4-LED bar graph (all Red) at 0, 3, 6, and 10dB
NR Active (Yellow); EQ Bypass (Red); Clip (Red); Low Cut (Red); +/-6dB (Yellow); +/-15dB (Red)
Operating Voltage
100VAC 50/60Hz; 120VAC 60Hz; 230VAC 50/60Hz
Power Consumption
Power Connector
IEC receptacle
Audio Specifications:
Input Type
Electronically balanced/unbalanced, RF filtered
Input Impedance
Balanced 40 kOhm, unbalanced 20 kOhm
Max Input
>+21dBu balanced or unbalanced
>40dB, typically >55dB at 1kHz
Output Connectors
1/4" TRS, male XLR (pin 2 hot), and barrier terminal strip
Output Type
Impedance-balanced/unbalanced, RF filtered
Output Impedance
Balanced 200 ohm, unbalanced 100 ohm
Max Output
>+21dBu balanced/unbalanced into 2 kOhm or greater; >+18dBm balanced/unbalanced (into 600 ohm)
10.6 lb (4.8 kg)
5.25 in (13.4 cm)
7.9 in (20.1 cm)
19 in (48.26 cm)

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