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The dbx12 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 in. 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 dbx12 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 in. 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
Inputs
- Connectors: 1/4 in. 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: andgt;+21dBu balanced or
unbalanced
- CMRR: andgt;40dB, typically andgt;55dB at 1kHz
Outputs
- Connectors: 1/4 in. 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: andgt;+21dBu balanced/unbalanced
into 2k ohm or greater
- andgt;+18dBm balanced/unbalanced (into 600 ohm)
System Performance
- Bandwidth: 20Hz to 20kHz, +0.5/-1dB
- Frequency Response: andlt;10Hz to andgt;50kHz, +0.5/-3dB
+/-15dB range +/-6dB range
- Dynamic Range: 109dB 115 dB
- Signal-to-Noise: 90 dB 97dB
- THD+Noise: andlt;0.005%
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
- Mains Connection: IEC receptacle
Physical
- Dimensions: 3.5 in. H X 19 in. W X 7.9 in. D
(8.9cm x 48.3cm x 20.1cm)
- Weight: 8.5 lbs. (3.9 kg)
- Shipping Weight: 9.5 lbs. (4.3 kg)
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