dbx 2231 Dual 31-Band Graphic Equalizer

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. dbx 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 (dbx's chief engineer, a nice guy, as far as engineers go) got the crazy idea of putting this new noise reduction stuff in the box. They 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. Check out the dbx 20 Series graphic EQ's at your pro audio outfitter. You'll see, with the 20 Series EQ's you get both MORE!!!

Features
Revolutionary patent-pending instant encode/decode Type III Noise Reduction increases S/N ratio by up to 20dB.

PeakPlus Limiter (also patent pending) threshold range from 0dBu to +20dBu

Four segment LED bargraph for BOTH Gain Reduction AND Output Level.

Status LEDs offer visual feedback for all settings on the front panel.

Technical Info

Inputs
Connectors: 1/4 in. TRS, female XLR (pin 2 hot), and barrier terminal strip
Type: Electronically balanced/unbalanced, RF filtered
Impedance: Balanced 40kS, unbalanced 20kS
Max Input Level: >+21dBu balanced or unbalanced
CMRR: >40dB, typically >55dB at 1kHz

Outputs
Connectors: 1/4 in. TRS, male XLR (pin 2 hot), and barrier terminal strip
Type: Impedance-balanced/unbalanced, RF filtered
Impedance: Balanced 200S, unbalanced 100S
Max Output Level: >+21dBu balanced/unbalanced into 2kS or greater
>+20dBm balanced/unbalanced (into 600)

System Performance
Bandwidth: 20Hz to 20kHz, +/-0.5dB
Frequency Response: <10Hz to >50kHz, +0.5/-3dB
Noise Reduction In (+/-6 and +/-12dB range):
Signal-to-Noise: >102dB, unweighted, ref: +4dBu, 22kHz measurement bandwidth
Dynamic Range: >120dB, unweighted
Noise Reduction Out: (+/-6dB range):
Signal-to-Noise: >94dB, unweighted, ref: +4dBu, 22kHz measurment bandwidth
Dynamic Range: >112dB, unweighted
Noise Reduction Out: (+/-12dB range):
Signal-to-Noise: >90dB, unweighted, ref: +4dBu, 22kHz measurement bandwidth
Dynamic Range: >108dB, unweighted
THD+Noise: <0.04%, 0.02% typical at +4dBu, 1kHz
Interchannel Crosstalk: <-80dB, 20Hz to 20kHz (2215/2231)
Noise Reduction: Up to 20dB of dynamic broadband noise reduction

Function Switches
Type III NR: Activates dbx Type III' Noise Reduction
EQ Bypass: Bypasses the graphic equalizer section in the signal path
Low Cut (recessed): Activates the 40Hz 18dB/octave Bessel high-pass filter
Range (recessed): Selects either +/- 6dB or +/- 15dB slider boost/cut range

Indicators
Output Level 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
Type III NR Active: Yellow LED
EQ Bypass: Red LED
Clip: Red LED
Low Cut Active: Red LED
+/-6dB range: Red LED
+/-12dB range: Red LED

Power Supply
Operating Voltage: 100VAC 50/60Hz, 120VAC 60Hz
230VAC 50/60Hz
Power Consumption: 23W
Mains Connection: IEC receptacle
Physical
Dimensions: 3.5" H X 19" W X 7.9" D (8.9cm x 48.3cm x 20.1cm)

Dual 31-band graphic EQ with built-in Type III noise reduction and PeakPlus limiter! XLR, TRS, and barrier strip I/O.