| 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
Inputs
- Connectors: 1/4 inch TRS, fenals XLR (pin 2 hot), and barrier terminal strip
- Type: Electronically balanced/unbalanced, RF filtered
- Maximum Input Level: >+21dBu balanced or unbalanced
- CMRR:>40dB, typically >55dB at 1kHz
Outputs
- Connectors: 1/4 inch TRS, male XLR (pin 2 hot), and barrier terminal strip
- Type: Impedance-balanced/unbalanced, RF filtered
- Impedance: Balanced 200 ohms, unbalanced 100 Ohms
- Maximum Output Level: >+21dBU balanced/unbalanced into 2kOhms or greater
>+18dBm balanced/unbalanced (into 600 ohms)
System Performance
- bandwidth: 20Hz to 20kHz, +0.5/-1dB
- Frequency Response: <10Hz to >50kHz, +0.5/-3dB
- Dynamic Range:
- +/-15dB Range: 109dB
- +-6dB Range: 115dB
- Signal-to-noise Ratio:
- +/-15dB Range: 90dB
- +-6dB Range: 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
- Rance (recessed): Selects either +/-6dB to +/-15dB slider boosy/cut range
Indicators
- Output Level: 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, 230VAC 50/60Hz
- Power Consumption: 24W
- Mains Connection: IEC receptacle
Physical
- Dimensions: 5.25 x 19 x 7.9 inches (8.9 x 48.3 x 20.1cm)
- Weight: 10.6 lbs.
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