Single Channel 31 Band Graphic Equalizer


Single Channel 31 Band Graphic Equalizer


The single channel 31 band EQ from Applied Research Technology features a 1/3 octave graphic equalizer constant Q circuitry with a 3% center frequency accuracy, 20mm center detent sliders, selectable boost/cut range of 6dB or 12dB, active balanced and unbalanced input and output connections, adjustable high pass filter, adjustable low pass filter, variable input level control, clip level indicators, ground lift switch, internal power supply and selectable line voltage switch. 

A range control switch is provided which allows you to set the maximum boost or cut for each band of equalization to either 6dB or 12dB. The high pass filter rolls off lower frequencies which is useful for decreasing rumble or low frequency hum from a signal . Its range is adjustable from 10Hz to 250Hz. Frequencies below this setting are rolled off, while frequencies above are unaffected. The low pass filter rolls off higher frequencies which is useful for reducing hiss or sibilance from a signal. Its range is adjustable from 3kHz to 40kHz. The rugged, all-steel constructed chassis occupies 1U rack space and is intended for installation in standard 19" equipment racks. 

The 351 Single Channel 31 Band Eq has the features and performance you need for any of your audio applications requiring equalization.


  • Single Channel 31- Band Graphic Equalizer

  • Constant-Q Filtering

  • Balanced XLR, Active Balanced 1/4", and

  • Unbalanced RCA Input and Output Connectors

  • +/- 6dB or +/-12dB Level Adjustments

  • 20mm Center Detected Frequency Band Sliders

  • Independent Level and Bypass Controls Per Channel

  • Designed for Years of continuous, reliable performance

  • Rugged All Steel Construction

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Channel Separation > 50dB

Power On/Off Switch; Filter Range Switch; Bypass Switch; Level Control; AC Voltage Selector; Ground Lift Switch

Filter Type

Constant Q - 3% center accuracy

Frequency Bands 31, 1/3 octave, ISO spacing
Frequency Response 20Hz to 20kHz, +0.5dB

6dB/12dB Range LEDs; Bypass and Clip LEDs

Input Impedance 20k Ω (bal), 15k Ω (unbal)
Input/Output Connections

Active balanced XLR and 1/4"
TRS {XLR pin 2/ 1/4" tip = Hot (+)}

Maximum Input Level +22dBm
Maximum Output Level +18dBm (bal), +22dBm (unbal)
Power (Switchable) 95-130VAC, 50/60Hz
Power Consumption 12 W
Range +/-6dB or +/-12dB selectable
Signal to Noise Ratio -94dB
Slider Travel

20mm w/ positive center detent

Total Harmonic Distortion 0.0001
Dimensions 1.75"H x 19"W x 8.5"D
Weight 4.5lbs (2.5kg)