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DBX 2231 Dual 31-Band Graphic Equalizer with Type III Noise Reduction
  • DBX 2231 Dual 31-Band Graphic Equalizer with Type III Noise Reduction
  • DBX 2231 Dual 31-Band Graphic Equalizer with Type III Noise Reduction

DBX 2231 Dual 31-Band Graphic Equalizer with Type III Noise Reduction

Item #: DBX-2231   •   MFG #: 2231


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With a prestigious heritage extending back to the heralded 30 Series equalizers, the dbx 2231 easily lives up to the revered dbx reputation. Besides including two 31-band channels of 1/3-octave equalization, the 2231 empowers you with flexible features like our PeakPlus limiter circuit, and DBX's amazing Type III Noise Reduction system. It also includes +12 dB input gain range; switchable +6 or +15 dB boost/cut range; XLR, Barrier strip, and 1/4in inputs; nonconductive nylon sliders; and an intuitive user interface with comprehensive output and gain reduction metering. As always, the inevitable result of our meticulous attention to detail and top-quality componentry is exceptional sound, performance, and reliability.

The most revolutionary feature of the 2231 is our proprietary Type III Noise Reduction system, which enables you to boost signal-to-noise ratios by up to an incredible 20dB. The result of this instant encode/decode process is that you're no longer forced to employ drastic EQ settings in effort to reduce system noise. Instead, you're freed to dedicate all EQ bands to the most important thing, the music. Further, DBX's PeakPlus limiter technology allows you to easily safeguard your gear against hazardous dynamic surges in program material. In addition to these formidable tools, the 2231's front panel provides at-a-glance insight as to gain reduction and output level status via its four-stage LED ladders. With such power and finesse built into such a reasonably priced package, it's easy to see why dbx 20 Series equalizers are relied upon by studio and touring professionals the world over. With such affordable quality, there's no longer any excuse for compromising your sound.

  • Features

    • Revolutionary instant encode/decode Type IIIr Noise Reduction in-circuit at the push of a button. Increases S/N ratio by up to 20dB
    • Patent-pending PeakPlusT Limiter threshold range from 0dBu to +24dBu (off) can transparently tame the wildest hits or the subtlest nuances of any signal
    • Four segment LED bargraph for BOTH Gain Reduction AND Output Level
    • Status LEDs offer visual feedback for all settings on the front panel
  • Specifications

    • Input Connectors: 1/4" TRS, female XLR (pin 2 hot), and barrier terminal strip
    • Input Type: Electronically balanced/unbalanced, RF filtered
    • Input Impedance: Balanced 40 kOhm, unbalanced 20 kOhm
    • Max Input: >+21dBu balanced or unbalanced
    • CMRR: >40dB, typically >55dB at 1kHz
    • Output Connectors: 1/4" TRS, male XLR (pin 2 hot), and barrier terminal strip
    • Output Type: Impedance-balanced/unbalanced, RF filtered
    • Output Impedance: Balanced 200 ohm, unbalanced 100 ohm
    • Max Output: >+21dBu balanced/unbalanced into 2 kOhm or greater; >+18dBm balanced/unbalanced (into 600 ohm)

    • Bandwidth: 20Hz to 20kHz, +/-0.5dB
    • Frequency Response: <10Hz to >50kHz, +0.5/-3dB
    • Signal-to-Noise (NR In: +/-6 and +/-15dB ranges): >102dB, unweighted, ref: +4dBu, 22kHz measurement bandwidth

    • Dynamic Range (NR In: +/-6dB and +/-15dB ranges): >120dB, unweighted
    • Signal-to-Noise (NR Out: +/-6dB range): >94dB, unweighted, ref: +4dBu, 22kHz measurment bandwidth

    • Dynamic Range (NR Out: +/-6dB range): >112dB, unweighted
    • Signal-to-Noise (NR Out: +/-15dB range) : >90dB, unweighted, ref: +4dBu, 22kHz measurement bandwidth

    • Dynamic Range (NR Out: +/-15dB range): >108dB, unweighted
    • THD+Noise: <0.04%, 0.02% typical at +4dBu, 1kHz
    • Interchannel Crosstalk: <-80dB, 20Hz to 20kHz
    • Noise Reduction: Up to 20dB of dynamic broadband noise reduction
    • NR Switch: Activates dbx Type III Noise Reduction
    • Bypass Switch: Bypasses the graphic equalizer section in the signal path
    • Low cut Switch: (recessed) Activates the 40Hz 18dB/octave Bessel high-pass filter
    • Range Switch: (recessed) Selects either +/- 6dB or +/- 15dB slider boost/cut range
    • I/O Meter: 4-LED bar graph (Green, Green, Yellow, Red) at -10, 0, +10, and +18dBu
    • Gain Reduction Meter: 4-LED bar graph (all Red) at 0, 3, 6, and 10dB
    • Indicators: NR Active (Yellow); EQ Bypass (Red); Clip (Red); Low Cut (Red); +/-6dB (Yellow); +/-15dB (Red)

    • Operating Voltage: 100VAC 50/60Hz; 120VAC 60Hz; 230VAC 50/60Hz
    • Power Consumption: 28W
    • Power Connector: IEC receptacle
    • Dimensions: 5.25" H X 19" W X 7.9" D (13.335cm x 48.3cm x 20.1cm)

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