ART HQ-231 Bruksanvisning

ART hi-fi system HQ-231

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HQ-231
DUAL CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER
with FDC™ - Feedback Detection Circuit
USER’S GUIDE
GENERAL INFORMATION
HQ-231 DUAL CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER WITH FDC™
Congratulations on the purchase of your new ART equalizer. This professional equalizer is perfect for
all applications and is also well suited for signal processing in situations where feedback is possible.
It’s features include ART FDC™ (Feedback Detection Circuit), and constant Q circuitry with a 3%
center frequency accuracy. It also features LED level metering, selectable range 6dB or 12dB, 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. The unit also features automatic bypass if power
to the unit is lost.
FDC™ - ART’s FEEDBACK DETECTION CIRCUIT
FDC (Feedback Detection Circuitry – designed and developed by ART Engineering) instantly illumi-
nates the corresponding EQ band with the greatest signal. That is, if feedback occurs, FDC identifies
the band with the feedback frequency for quick correction.
During operation, various LED’s will illuminate as the signal passes. The loudest band will correspond
with the brightest LED. When you hear feedback, FDC (and it’s brightest LED) shows you where to
attenuate.
FDC confirms what you hear (feedback), and shows you exactly where it is. You’ll also know you
have properly attenuated the signal as the LED reduces its illumination. FDC - it is both precise and
simple.
FDC APPLICATIONS
FDC allows you to observe those frequency bands with the greatest energy when program material is
being played. In a live sound system where the HQ EQ is in the path between a microphone and
loudspeakers, dominant room modes may be seen as bands with a lot of energy when the sound
system gain is increased. These bands with excess energy will brightly illuminate the corresponding
led in the offending frequency’s fader. These frequencies will generally be the first where feedback is
likely to occur.
2
FDC can also be employed as a simple spectrum analyzer along with its primary use with the equal-
izer. This will allow you to identify “hot” spots – area of potential feedback – and attenuate accordingly
before feedback occurs. Of course, during a musical performance, FDC will help you quickly locate
and eliminate feedback if it occurs.
Be careful when running a sound system close to its feedback limit. Feedback can damage equip-
ment as well as hearing.
FDC SYSTEM PRECISION
The HQ EQ circuitry is extremely precise. The equalizer features Constant-Q Filtering, which helps
the HQ’s FDC work with great efficiency. When feedback occurs at a certain band, the ensuing
attenuation will not affect surrounding bands. This precision is, of course, critical for professional
applications.
INSTALLATION
These equalizers are designed for mounting in a standard 19” equipment rack or one of the many
rack type portable cases available on the market. The vertical height is 3.5 inches and depth is 7.5
inches.
POWER CONNECTORS
This series of graphic equalizers have internal power supplies and are designed for operation from
120 or 240 volt, 50-60Hz mains supply. Power consumption is 30 watts. In new installations and
portable sound systems, or any situation in which the mains power is in question, it is wise to confirm
the voltage and select the appropriate line voltage switch BEFORE connecting the equalizer to power
sources.
INPUT/OUTPUT CONNECTIONS
This series of graphic equalizers have 3 sets input output connectors wired in parallel: XLR, 1/4"
phone, and RCA phono connectors.
Only one of the 3 inputs should be used per channel. Any combination of output connectors may be
used.
XLR connections are balanced where pin 2 is High (+), pin 3 is Low (-), and pin 1 is ground.
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Produktspecifikationer

Varumärke: ART
Kategori: hi-fi system
Modell: HQ-231

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