ART HQ231 Dual 31 Band Graphic Equalizer (with FDC Feedback Detection)


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Dale #:ART-HQ231

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  • The HQ231 Dual 31-band Graphic EQ is perfect for any live sound application where there is a high feedback potential including monitor mixes, side-fill cabinets or high powered front-of-house mixes situations. The HQ231 features ART's proprietary FDC™ (Feedback Detection Circuit), with constant Q circuitry capable of delivering a 3% center frequency accuracy. Professional features like LED level metering, selectable 6dB or 12dB slider range, active balanced and unbalanced input & output connectors, RFI filters, independent variable Hi Pass (low cut) and Low Pass (high cut) filters, variable input level control, passive bypass switch, clip level indicator, ground lift switch, and selectable line voltage switch make it ideal for any professional application or touring system.


    • FDC Feedback Detection Circuit
    • Dual Channel 31-Band Graphic Equalizer
    • Output Level VU Metering on Each Channel
    • Constant-Q Filtering
    • Individual High and Low Pass Filters on Each Channel
    • Center-Detented Frequency Band Sliders
    • Independent Level and Bypass Controls on Each Channel
    • Relay Bypass - If Power is Lost, Signal Will Still Pass
    • Variable Input Controls
    • Signal Clip Level Indicators
    • Ground Lift Switch
    • Internal Power Supply
    • Selectable Line Voltage
  • Filter TypeConstant Q -3% center accuracy
    Frequency Bands2 x 31, 1/3 octave, ISO spacing
    Frequency Response20Hz- 20kHz, +/-0.5dB
    IndicatorsOUTPUT NOISE: -94dBm (unweighted)
    Input Impedance20K ohms typical
    Input/Output ConnectionsActive balanced XLR and 1/4" TRS, Unbalanced RCA
    Maximum Input Level+22dBm
    Maximum Output Level+22dBm
    Power (Switchable)95-125 VAC, 50/60Hz, 190-250 VAC, 50Hz
    Range+/-6dB or +/-12dB selectable
    Total Harmonic Distortion.01% (20Hz-20kHz+10 dBu )
    Dimensions7.5" d x 19.0" w x 3.5" h
    Weight12 lbs
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