EQUALIZER 31x2
dbx 1231 Dual 31Band Graphic Equalizer
อีควอไลด์เซอร์ สไลด์ยาว 31ช่อง x2
OVERVIEW
The 1231 is dual channel, 31 band 1/3 octave graphic equalizer. It was designed to meet the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls.
The sliders of the 1231 are 45mm center detent, with two selectable boost/cut ranges for precise gain adjustments. The unit features high pass filters with bypass, active balanced input and output connections, chassis/signal ground lift capabilities for quick hum isolation and an internal power supply. Multiple input and output configurations are provided for ease of use. The XLR and 1/4" TRS connectors use active balanced, low noise circuitry, with the addition of barrier strips.
The 1231 was precision engineered to provide years of maintenance-free operation in any application. The magnetically isolated transformer, RF-filtered inputs and outputs, and power-off hard-wire relay bypass with two second power up delay, ensures compatibility with all types of installations.
FEATURES
- Switchable boost/cut ranges of ±6 or ±15 dB
- 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
| 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, +0.5/-1dB |
| Frequency Response | <10Hz to >50kHz, +0.5/-3dB; +/-15dB range; +/-6dB range |
| Dynamic Range | 109dB; 115dB |
| Signal to Noise Ratio | 90dB, 97dB |
| THD+Noise | <0.005% |
| Interchannel Crosstalk | <-80db, 20Hz to 20kHz |
| 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 |
| Indicators | EQ Bypass (Red); Clip (Red); Low Cut (Red); +/-6dB (Yellow); +/-15dB (Red) |
| Operating Voltage | 100VAC 50/60Hz; 120VAC 60Hz; 230VAC 50/60Hz |
| Power Consumption | 24W |
| Power Connector | IEC receptacle |
| Dimensions | 5.25" H X 19" W X 7.9" D (13.4cm x 48.3cm x 20.1cm) |
