Art HD 131 User Manual page 3

The new ART HD-Series of Precision Graphic Equalizers have been designed
and engineered to exceed extremely high standards for audio performance and
functionality. These innovative, high-quality equalizers are perfect for virtually any
audio application where precision frequency tailoring, reliable performance, rug-
ged design and extremely silent processing is of the utmost priority.
Active Filter Sections
The HD-Series of Precision Graphic Equalizers
feature active filter sections, which incorporate a
constant-Q design. This constant-Q design, with
accurate precision center frequencies, ensures
that the bandwidth of every individual filter will be
narrow enough to prevent unnecessary interaction
between filters, yet still create an equalization curve
wide enough to produce the exact and precise
processing of audio frequencies the user seeks.
Precision Slide Potentiometers
The HD-Series of Precision Graphic Equalizers
utilize 20mm precision slide potentiometers. These
center-detented, precision faders are graphically
positioned on ISO center frequencies between
25Hz-20kHz for model 215, 20Hz to 20kHz for
models 131 and 231.
Independent Variable Hi and Low Pass Filtering
In order to deliver superlative performance and
control, the HD-Series of Precision Graphic Equal-
izers incorporates independent variable Hi Pass
(low cut) and Low Pass (high cut) filters. Having
separate and variable precision control for both
the Hi Pass and Low Pass filters, allow the user to
custom tailor the audio signal to perfection.
Many competing products only feature shelving
switches which have a fixed frequency point.
Others do not have separate filtering for both high
and low frequencies. These designs do not offer
the precision or control of the ART HD-Series.
Automatic Relay Bypass
The HD-Series of Precision Graphic Equalizers
also feature automatic relay bypass of audio, an
essential function if power to the unit is lost.
Rugged construction and solid audio performance
make these equalizers particularly well suited to
fixed installation as well as touring live sound
systems.
Additional Controls and Indicators
The HD-Series of Precision Graphic Equalizers
utilize a variable input level control, clip level
indicator, ground lift switch, and selectable line
voltage.
Additional features include selectable Scale Switch-
ing - (High Slider Resolution +/-12dB - or Normal
Resolution (+/-6dB), active balanced and unbal-
anced input/output connectors, and RFI filtering.
A passive Bypass switch allows for direct compari-
son between the equalized and non-equalized
signal for each channel.
Multiple Connectivity
The HD-Series of Precision Graphic Equalizers are
connectable with a wide variety of audio devices.
Each unit has three sets of input and output con-
nectors wired in parallel. These connections include
XLR, 1/4" phone, and Euroblock barrier strip
connectors.
Durability by Design
The HD-Series of Precision Graphic Equalizers are
designed and engineered to be durable and rug-
ged. They are an ideal choice when the need for a
robust equalizer is of paramount concern. They are
designed for mounting in a standard 19" equipment
rack or one of the many rack type portable cases in
existence. The vertical height is 1.75 inches for the
HD215 and HD131, and 3.5 inches for the HD231.
The depth is 7 inches.
Precision and Quality
When considering quality equalization, the ART HD
Series of Precision Graphic Equalizers are an
excellent choice. They deliver extremely precise,
powerfully flexible and simply great sounding
equalization, with the quality features and reliable
design criteria necessary for top-level audio per-
formance.
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