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DBX1231

Dual Channel 31-Band Equalizer




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 1/4'' 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

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

<10Hz to >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. 

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