1231

1231 dual 31-band 3U equalizer

Technical parameter:

Dual 31-band graphic equalizer: selectable boost/attenuation range: ±6dB and ±15dB, electronic balanced/unbalanced input, servo balanced/unbalanced output, both input and output are equipped with RF filters XLR, row-shaped Terminal block and 1/4" TRS interface, -12dB/+12dB input gain range, 18dB/octave 40Hz Bessel type low-frequency switching filter, chassis/signal grounding suspension capability, built-in power supply, power off Hardwire relay bypass and power-on delay of 2 seconds.

Input

Interface: 1/4 inch TRS, XLR socket (2-pin are hot positive, female plug), and strip terminal

Type: Electrically balanced/unbalanced, with RF filtering

Impedance: Balanced is 40kΩ, unbalanced is 20kΩ

Maximum input level: >+21dBu, balanced or unbalanced

Common analog ratio: >40dB, typical value>55dB, 1KHz

Output

Interface: 1/4 inch TRS, XLR socket (2-pin are hot positive, female plug), and strip terminal

Type: Impedance balanced/unbalanced, with RF filtering

Impedance: Balanced is 200Ω, unbalanced is 100Ω

Maximum input level: >+21dBu, balanced/unbalanced 2kΩ load or greater

Total analog ratio: 18dBu, balanced/unbalanced (connected to 600Ω load)

System performance

Bandwidth: 20Hz-20KHz, +0.5dB/-1Db

Frequency response

Dynamic range: 109dB 115dB

Signal to noise ratio: 90dB 97dB

Total harmonic distortion + noise: <0.005%

Crosstalk between channels: ＜-80dB, 20Hz-20KHz

Function switch

Equalization bypass: bypass the graphic equalization part in the signal path

Low frequency switching (concealed): Start 40Hz 18dB/oct Bessel high-pass filter

Range (concealed type): select ±6dB or ±15dB fader boost/attenuation range

Indicator light

Output level: 4-LED bar graph indicator lights (green, green, yellow, red) corresponding to -10, 0, +10 and +18dBu

Equalization bypass: one LED: red Clipping indication: one LED; red

Low frequency switching: one LED: red +/6dB; one LED; yellow

±15dB: One LED: red

power supply:

Working voltage: 230VAC 50Hz

Power consumption: 24W

Power interface: IEC plug

Dimensions and weight:

1231: (Height 13.4cm×Width 48.3cm×Depth 20.1cm)