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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.

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

INPUT

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

Type: Electronically balanced/unbalanced, RF filtered

Impedance: Balanced 40 kOhm, unbalanced 20 kOhm

Max Input Level: >+21dBu balanced or unbalanced

CMRR: >40dB, typically >55dB at 1kHz

OUTPUTS

Connectors: 1/4" TRS, male XLR (pin 2 hot), and barrier terminal strip

Type: Impedance-balanaced/unbalanced, RF filtered

Impedance: Balanced 200 ohm, unbalanced 100 ohm

Max Output Level: >+21dBu balanced/unbalanced into 2 kOhm or greater
>+18dBm balanced/unbalanced (into 600 ohm)

SYSTEM PERFORMANCE

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: 90dB, 97dB

THD + Noise: <0.005%

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

FUNCTION SWITCHES

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

EQ Bypass: 1 LED: Red

Clip: 1 LED: Red

Low Cut: 1 LED: Red

+/-6dB: 1 LED: Yellow

+/-15dB: 1 LED: Red

POWER SUPPLY

Operating Voltage: 100VAC 50/60Hz, 120VAC 60Hz

Power consumption: 24W

Main Connection: IEC receptacle

PHYSICAL

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

Weight: 10.6 lbs.

Shipping Weight: 11.6 lbs.

Note: Specifications subject to change without notice.

 

For more information check out the Cut Sheet &/or the Operating Instructions

Warranty Information: