dbx 1231 Dual-Channel 31-Band Graphic Equalizer
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Description
The dbx 1231 is a two-channel, 31-band graphic equalizer with 1/3-octave bands on ISO center frequencies. It is built for demanding sound reinforcement and installed systems, with straightforward controls in a 3U steel and aluminum chassis.
The 45 mm center-detent faders work over a selectable ±6 dB or ±15 dB range. Each channel has ±12 dB of input gain and a switchable 40 Hz low-cut filter. XLR, 1/4 in. TRS and barrier strip connectors ease installation, and a chassis/signal ground lift helps isolate hum. A hard-wired relay bypasses the unit when the power is off and waits 2 seconds after power-up before switching back in.
Features
- Two channels of 31-band, 1/3-octave equalization on ISO center frequencies
- 45 mm center-detent faders
- Switchable ±6 dB or ±15 dB boost/cut range
- ±12 dB input gain range
- Switchable 40 Hz, 18 dB per octave Bessel low-cut filter
- Electronically balanced inputs and servo-balanced outputs
- RF-filtered inputs and outputs
- XLR, 1/4 in. TRS and barrier strip connectors
- Chassis/signal ground lift
- Internal power supply transformer
- Power-off hard-wire relay bypass with a 2-second power-up delay
Specifications
- Channels: 2
- Bands: 31 per channel, 1/3-octave, ISO centers
- Input Connectors: 1/4 in. TRS, female XLR (pin 2 hot) and barrier strip
- Input Type: Electronically balanced/unbalanced, RF filtered
- Input Impedance: 40k ohms balanced, 20k ohms unbalanced
- Maximum Input Level: More than +21 dBu, balanced or unbalanced
- CMRR: More than 40 dB, typically more than 55 dB at 1 kHz
- Output Connectors: 1/4 in. TRS, male XLR (pin 2 hot) and barrier strip
- Output Type: Impedance-balanced/unbalanced, RF filtered
- Output Impedance: 200 ohms balanced, 100 ohms unbalanced
- Maximum Output Level: More than +21 dBu into 2k ohms or greater; more than +18 dBm into 600 ohms
- Bandwidth: 20 Hz to 20 kHz, +0.5/-1 dB
- Frequency Response: Under 10 Hz to over 50 kHz, +0.5/-3 dB
- Signal-to-Noise Ratio: More than 90 dB, ref. +4 dBu
- THD+Noise: Less than 0.005%, 1 kHz at +4 dBu
- Interchannel Crosstalk: Below -80 dB, 20 Hz to 20 kHz
- Boost/Cut Range: ±6 dB or ±15 dB, recessed switch
- Low-Cut Filter: 40 Hz, 18 dB/octave Bessel high-pass, recessed switch
- Meters: 4-LED bar graph at -10, 0, +10 and +18 dBu
- Power Consumption: 24 W
- Power Connector: IEC receptacle
- Rack Space: 3U
- Dimensions (H x W x D): 5.25 x 19 x 7.9 in. (13.4 x 48.3 x 20.1 cm)
- Weight: 10.6 lb (4.8 kg)
In the Box
- dbx 1231 graphic equalizer
- AC power cord
- Operation manual
- Registration card
- Four rack mount screws and washers