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. It’s no wonder that dbx has been a leader in the industry for over 25 years. FEATURES: Switchable Boost/Cut range between ±6dB and ±15dB 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" TRS, female XLR (pin 2 hot), and barrier terminal strip 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), and barrier terminal strip Type: Impedance-balanced/unbalanced, RF filtered Impedance: Balanced 200 ohm, unbalanced 100 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: 50kHz, +0.5/-3dB +/-15dB range +/-6dB range Dynamic Range: 109dB 115 dB Signal-to-Noise: 90 dB 97dB THD+Noise:
