3U Dual 31 Band EQ

The dbx 12 Series were designed to meet the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls. The 1231 provides standard features like dual-channels, 31 1/3 octave bands, ISO frequency centers, +/12 dB input gain range, and switchable 40Hz/18 dB per octave low-cut filters, but also includes other insightful features. These include 45 mm faders; selectable +/-6dB or +/-15dB boost/cut range for precise gain adjustments; XLR, barrier strip, and 1/4inch TRS connectors for installation ease; balanced inputs and outputs for quiet operation; and chassis/signal ground lift capabilities for quick hum isolation. The visionary design of the dbx 12 Series makes your job easier.

The dbx 12 Series Equalizers were precision engineered to provide years of maintenance-free operation in any application. The magnetically isolated transformer, electronically balanced/unbalanced inputs and servo balanced/unbalanced outputs, RF-filtered inputs and outputs, and power-off hard-wire relay bypass with 2 second power up delay were steps our engineers took to ensure compatibility for all installations. Only the best components were utilized, yielding a 10Hz to 50kHz frequency response, greater than 90dB SNR (ref +4dBu), less than 0.005% THD +Noise (1kHz at +4dBu), and interchannel crosstalk of less than -80dB from 20Hz to 20kHz. All this attention to detail is contained in a 3U steel/aluminum chassis.

 

Features

 

Switchable boost/cut ranges of ±6 or ±15 dB
Electronically balanced/unbalanced inputs
Servo balanced/unbalanced outputs
RF filtered inputs and outputs
XLR, Barrier Strip, and 1/4″ TRS connectors
-12dB/+12dB input gain range
18dB/octave 40Hz Bessel low-cut filter
Chassis/signal ground lift capability
Internal power supply transformer
Power-off hardwire relay bypass with 2-second power-up delay

 

Downloads

 

 
Version
Language
Size
Uploaded

 1231 CAD drawing front
 
 
207 KB
Feb 15, 2022

 1231 CAD drawing rear
 
 
236 KB
Feb 15, 2022

 1231 Cut Sheet-English
 
 
327 KB
Feb 15, 2022

 1231 Owner’s Manual-English
 
 
1.5 MB
Feb 15, 2022

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Specifications

 

Input Connectors
1/4″ TRS, female XLR (pin 2 hot), and barrier terminal strip

Input Type
Electronically balanced/unbalanced, RF filtered

Input Impedance
Balanced 40 kOhm, unbalanced 20 kOhm

Max Input
>+21dBu balanced or unbalanced

CMRR
>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)

Bandwidth
20Hz to 20kHz, +0.5/-1dB

Frequency Response
50kHz, +0.5/-3dB; +/-15dB range; +/-6dB range

Dynamic Range
109dB; 115dB

Signal to Noise Ratio
90dB, 97dB

THD+Noise
<0.005%

Interchannel Crosstalk
<-80db, 20Hz to 20kHz

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

Indicators
EQ Bypass (Red); Clip (Red); Low Cut (Red); +/-6dB (Yellow); +/-15dB (Red)

Operating Voltage
100VAC 50/60Hz; 120VAC 60Hz; 230VAC 50/60Hz

Power Consumption
24W

Power Connector
IEC receptacle

Dimensions
5.25" H X 19" W X 7.9" D (13.4cm x 48.3cm x 20.1cm)

Unit Weight
10.6 lbs.

Shipping Weight
11.6 lbs.