The newest member of the HQ Series, HQ 231, features ART's FDC Feedback Detection Circuitry. The ART proprietary FDC differs from similar systems in that it is extremely fast. Although it illuminates the band with the greatest energy with the brightest LED, it doesn't fully discriminate between bands and will not get "stuck" on one band when there is no signal.
The HQ 231 utilizes a set of indicators that show which of the many EQ bands has the greatest energy. The LED indicators can immediately show which band corresponds to the feedback frequency, allowing the sound engineer to reduce gain in that band to quickly kill the feedback while having a minimal impact on the sound of the live program material. The FDC also acts as a simple spectrum viewer while the concert proceeds showing where the 'hot' areas are. During system setup and sound check, the FDC may be used to help identify room and sound system resonances. By increasing the gain until feedback, it is easy to identify those frequencies that are likely to be problems. Reducing the gain in these bands helps tune the sound system, and, remove problem areas before the show begins. It also helps increase the gain margin before feedback.
The unit also features constant Q circuitry, 45mm center detent sliders with selectable boost or cut range of 6dB or 12dB, balanced XLR, 1/4 in. and unbalanced RCA input and output connections, high and low pass filters, analog level metering, variable input controls, signal clip level indicators, ground lift switch, internal power supply and selectable line voltage. The rugged, all-steel chassis occupies 2U rack spaces and is intended for installation into standard 19 in. equipment racks.
Applications for the HQ-231 include Live Sound Systems/PA, Permanent or Fixed Installations, Church, Club and Practice PA Systems, DJ Sound Systems, Home and Project Recording Systems, and Monitor Systems.
Features:
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 Chanel
Center-Detented Frequency Band Sliders
Independent Level and Bypass Controls on Each Channel
Relay Bypass -- If Power is Lost, Signal Will Still Pass
Occupies 2 Rack Spaces
Variable Input Controls
Signal Clip Level Indicators
Ground Lift Switch
Internal Power Supply
Selectable Line Voltage
Technical Info
Dimensions: 7.5 in d x 19.0 in w x 3.5 in h
Filter Type: Constant Q 3% center accuracy
Frequency Bands: 2 x 31, 1/3 octave, ISO spacing
Frequency Response: 20Hz 20kHz, +/- 0.5dB
Output Noise: 94dBm (unweighted)
Input Impedance: 20K ohms typical
Input/Output Connections: Active balanced XLR and 1/4in 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% (20Hz20kHz+10 dBu )
Weight: 12 lbs.
