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dbx 2231 Graphic Equaliser Front Panel

With a prestigious heritage extending back to the heralded dbx 30 Series equalizers, the dbx 2231 easily lives up to the revered dbx reputation. In addition to including two 31-band channels of 1/3-octave equalization, the dbx 2231 provides the unique features of the dbx PeakPlus™ limiter circuit, and the amazing dbx Type III™ Noise Reduction system. It also includes +12 dB input gain range, switchable +6 or +15 dB boost/cut range, nonconductive 45mm stroke nylon sliders, and an intuitive user interface with LED bar output and gain reduction metering. The most revolutionary feature of the dbx 2231 is the proprietary dbx Type III™ Noise Reduction system, which enables you to boost signal-to-noise ratios by up to an incredible 20 dB 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 can dedicate all EQ bands to the most important thing, the music. The built-in dbx PeakPlus™ limiter technology allows you to easily protect your equipment against destructive dynamic surges in program material. The dbx 2231 EQ’s front panel provides at-a-glance insight as to gain reduction and output level status via its four-segment LED bar graphs. 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.


Features

  • Dual Channel.
  • Selectable instant encode/decode dbx Type III Noise Reduction increases S/N ratio by up to 20 dB
  • Patent-pending PeakPlus™ Limiter threshold range from 0 dBu to +24 dBu (off).
  • Electronically balanced inputs via XLR, barrier strip and TRS connectors.
  • Servo balanced inputs via XLR, barrier strip and TRS connectors.
  • RF-filtered inputs and outputs.
  • 45 mm stroke faders with centre detent.
  • 31 1/3 octave bands per channel on ISO frequency centres.
  • 18 dB per octave 40 Hz Bessel low-cut filter with recessed switch.
  • Selectable +/-6 dB or +/-15 dB boost/cut range with recessed switch for precise gain adjustment.
  • Equaliser bypass switch to bypass the graphic equalizer section in the signal path.
  • Noise Reduction switch activates dbx Type III Noise Reduction.
  • Low-Cut and Range switches recessed to prevent accidental operation.
  • Output level indicator - four segment LED bar graph (Green, Green, Yellow, Red) at -10, 0, +10, and +18 dBu.
  • Gain Reduction indicator - four segment LED bar graph (Green, Green, Yellow, Red) at -10, 0, +10, and +18 dBu.
  • LED indicators for Type III NR Active, EQ Bypass, Clip, Low Cut Active, +/-6 dB, +/-15 dB.
  • Chassis/signal ground lift capabilities for quick hum isolation
  • 3U rack mounting steel/aluminium chassis.
  • Magnetically shielded internal power supply transformer.

Rear Panel Layout

dbx 2231 Graphic Equaliser Rear Panel

Technical Specifications

Frequency Response < 10 Hz to > 50 kHz, +0.5/-3 dB
T.H.D. + Noise < 0.04 %, 0.02 % typical at +4 dBu, 1 kHz
Interchannel Crosstalk < -80 dB, 20 Hz to 20 kHz
CMRR > 40 dB, typically > 55 dB at 1 kHz
Input Level Max > +21 dBu balanced or unbalanced
Input Impedance Balanced 40 k ohms, unbalanced 20 k ohms
Input Connectors 1/4" TRS, female XLR (pin 2 hot), and barrier terminal strip
Input Type Electronically balanced/unbalanced, RF filtered
Output Level Max > +21 dBu into 2 k ohms or greater,> +18 dBm into 600 ohms
Output Impedance Balanced 200 ohms, unbalanced 100 ohms
Output Connectors 1/4" TRS, female XLR (pin 2 hot), and barrier terminal strip
Output Type Impedance-balanced/unbalanced, RF filtered
Noise reduction In (+/-6 and +/-15 dB range)
Signal to Noise Ratio > 102 dB, unweighted, ref: +4 dBu, 22 kHz measurement bandwidth
Dynamic Range > 120 dB, unweighted
Noise Reduction Up to 20 dB of dynamic broadband noise reduction
Noise reduction Out (+/-6 dB range)
Signal to Noise Ratio > 94 dB, unweighted, ref: +4 dBu, 22 kHz measurement bandwidth
Dynamic Range > 112 dB, unweighted
Noise reduction Out (+/-15 dB range)
Signal to Noise Ratio > 90 dB, unweighted, ref: +4 dBu, 22 kHz measurement bandwidth
Dynamic Range > 108 dB, unweighted
Power Supply Required AC Mains 100 VAC 50-60 Hz, 120 VAC 60 Hz, 230 VAC 50-60 Hz
Power Consumption 23W
Construction Steel and aluminium panels, Black enamel finish

Dimensions

Width ..... 483 mm
Depth ..... 201 mm
Height ..... 134 mm
Weight .... 4.9 Kg
dbx 20 Series Graphic EQ Dimensions

Ordering Information

Description Order Code
dbx 2231 Graphic Equaliser DBX-2231
The information presented on this page is provided by courtesy of dbx Professional Products.
Revised: 21-Dec-2010 Copyright (C) 2010 Adena Limited