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.

When the pros need an EQ, they turn to dbx. With a proven track record of ruggedness and reliability, dbx EQ’s are widely known as the industry standard at all levels. They just work, in the studio or on the road. The respected dbx heritage includes over 30 years of experience, patents, and awards, and these EQ’s maintain that tradition of excellence.

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

Application

Installed Sound
Portable Sound
Tour Sound
Studio Sound

DETAILED SPECIFICATIONS

Input

• Connectors: 1/4" TRS, female XLR (pin 2 hot)
• Type: Electronically balanced/unbalanced, RF filtered
• Impedance: Balanced 40k ohm, unbalanced 20k ohm
• Max Input Level: >+21dBu balanced or unbalanced
• CMRR: >40dB, typically >55dB at 1kHz

Outputs

• Connectors: 1/4" TRS, male XLR (pin 2 hot)
• Type: Impedance-balanaced/unbalanced, RF filtered
• Impedance: Balanced 100 ohm, unbalanced 50 ohm
• Max Output Level: >+21dBu balanced/unbalanced into 2k ohm 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
• Dynamic Range: 108dB
• Signal-to-Noise: 90dB
• THD+Noise: <0.004%
• Interchannel Crosstalk: <-80dB, 20Hz to 20kHz

Function Switches

• EQ Bypass: Bypasses the graphic equalizer section in the signal path
• Low Cut: Activates the 50Hz 12dB/octave high-pass filter
• Range: Selects either +/- 6dB or +/- 12dB slider boost/cut range

Power Supply

• Operating Voltage: 100VAC 50/60Hz, 120VAC 60Hz, 230VAC 50/60Hz
• Power consumption: 15W
• Main Connection: IEC receptacle