Applied Research and Technology (ART) HQ231 Specification

HQ-231

D UAL 31-BAND GRAPHIC EQUA L I Z E R

WITH FDC™F E E D BACK DETECTION CIRCUIT

The A RT HQ-231 Dual 31-Band EQ features A RT ’s
p r o p r i e t a ry FDC™ (Feedback Detection Circ u i t )
found exclusively in A RT equalizers. FDC shows
you exactly where feedback is occurring – quick l y
and precisely – making the proper attenuation of
offending frequencies fast and easy.

Professional quality feature s , functionality and
a new low-noise design make the HQ-231 an
outstanding equalizer. The HQ-231 has Constant­Q filtering with ISO centers,independent va r i a b l e
high-pass and low-pass filters, L E D - i l l u m i n a t e d
detented slide potentiometers,s w i t chable +/- 6db
or +/-12db boost/cut ra n g e, i n d e p e n d e n t level a n d
bypass controls,and EQ output LED metering.

During opera t i o n , various EQ band LED’s will
illuminate as the HQ-231 processes a signal. T h e
loudest band will correspond with the brightest
L E D. When feedback occurs,FDC (and it’s brightest
L E D ) s h ows you exactly where to attenuate – it’s
that simple! You’ll also know you have properly
attenuated the signal as the LED reduces it’s
i l l u m i n a t i o n .

The HQ-231 EQ circ u i t ry is ex t remely pre c i s e,a n d
the Constant-Q filtering helps the HQ’s FDC wo r k
with great efficiency. When f e e d b a ck occurs at a
certain band, the ensuing attenuation will not
affect surrounding bands. This p recision is, o f
c o u r s e, absolutely critical for professional
applications and situations where top audio
p e r f o rmance is a re q u i re m e n t .

A d d i t i o n a l l y, FDC enables you to observe those
f re q u e n cy bands with the greatest energy when
p r o gram material is being playe d , and can help
to quickly locate dominant room modes during
system setup.

The HQ-231 is ex t remely useful for equalization
and feedback elimination in a wide variety of
s i t u a t i o n s , including live sound re i n f o rc e m e n t ,
monitor mixes, nightclub and DJ applications,
ch u rch e s , re s t a u rants and many more environ­ments where precision equalization and feedback
detection is essential.

HQ231 FEATURES:

✔ Low Noise –High Performance

Circuitry

✔ Dual 31–Band EQ
✔ FDC™ Feedback Detection

Circuit

✔ Constant–Q filtering with

ISO Centers

✔ LED Illuminated Detented

Sliders

✔ Switchable Power Line Voltage
✔ 2U Rack Spaces
✔ Independent Variable High–P a s s

and Low-Pass Filters

✔ Switchable +/- 6db or +/-12db

Boost/Cut Range

✔ Independent Level and

Bypass Controls

✔ Equalizer Output LED Metering

F rom the innovative minds at ART.

F rom the innovative minds at ART.

Applied Research & Te c h n o l o g y • 215 Tre m o n tSt., Rochester, NY 14608 •USA • 585.436.2720 tel • 585.436.3942 fax •w w w. a rt p ro a u d i o . c o m

H Q - 2 3 1

D UAL 31-BAND GRAPHIC EQUALIZER WITH FDC

D i m e n s i o n s 7.5” d x 19.0” w x 3.5” h
We i g h t 12 lbs.
Frequency Bands 2 x 31, 1/3 octave, ISO spacing
Filter Ty p e C o n s tant Q –3% center accuracy
R a n g e +/–6dB or +/–12dB selecta b l e
Frequency Response 20Hz– 20kHz, +/–0.5dB
Output Noise – 94dBm (unweighted)
T HD + Noise . 01% (20Hz–20kHz+10 d B u )
Input/Output Connections Active balanced XLR and 1/4” TRS

Unbalanced RCA
Maximum Input Le v e l + 2 2 d B m
Maximum Output Le v e l + 2 2 d B m
Input Impedance 20K ohms typica l
Power (Switch a b l e ) 95 – 1 2 5 VAC, 50 / 60 H z

190 – 2 50 VAC, 50 H z

HQ-231
APPLICATIONS:

™

✔ Professional, Home

and Project Recording
Studios

✔ Live Sound Systems
✔ PA Systems

Permanent/Fixed
Installs

✔ Churches and

Concert Halls

✔ Nightclubs and Practice

PA systems

✔ DJ and Karaoke Sound

Systems

✔ Monitoring Systems

Date:
ART Representative:

ART Representative Information:

Notes:

F rom the innovative minds at ART.

F rom the innovative minds at ART.

Applied Research & Te c h n o l o g y • 215 Tre m o n tSt., Rochester, NY 14608 •USA • 585.436.2720 tel •585.436.3942 fax •w w w. a rt p ro a u d i o . c o m

Features and specifications subject to change without notice. ©2002 Applied Research and Te ch n o l o g y ART- HQ 2 3 1 - S p e c s - 090 2