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.
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
230VAC 50/60Hz
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.
