HQ31 – Pro Single 31 Band EQ w/ FDC? Overview
The HQ SERIES HQ-31 features ART?s FDC Feedback Detection Circuitry. The A R T 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-31 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.
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 HQ31 also features Constant-Q circuitry, 45mm center detent sliders with selectable boost or cut
range of 6dB or 12dB, balanced XLR, Ό? 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? equipment racks.
Applications for the HQ-31 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
HQ31 – Pro Single 31 Band EQ w/ FDC? Features:
FDC? Feedback Detection Circuit
Single Channel 31-Band Graphic Equalizer
Output Level VU Metering on Each Channel
Individual High and Low pass filters
Full 45mm 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