Art HD215 User Manual
HD131 SINGLE CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC
EQUALIZER
HD215 DUAL CHANNEL 15 BAND 2/3 OCTAVE GRAPHIC EQUALIZER
HD231 DUAL CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER
IMPORTANT SAFETY INSTRUCTION – READ FIRST
This symbol, whenever it appears, This symbol, wherever it appears, alerts you
alerts you to the presence of uninsulated to important operating and maintenance
dangerous voltage inside the enclosure-voltage instructions in the accompanying literature.
that may be sufficient to constitute a risk of shock. Please Read manual.
Read instructions:
Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the
equipment. Follow the operating instructions printed in this user guide.
Do not open:
There are no user serviceable parts inside. Refer any service work to qualified technical personnel only.
Power sources:
Connect the unit to mains power only of the type described in this user guide or marked on the rear panel. The
power source must provide a good ground connection.
Power cord:
Use the power cord with sealed mains plug appropriate for your local main supply as provided with the equipment. If the provided plug does not fit into you outlet consult your service agent. Route the power cord so that it
is not likely to be walked on, stretched or pinched by items placed upon or against.
Grounding:
Do not defeat the grounding and polarization means of the power cord plug. Do not remove or tamper with the
ground connection on the power cord.
Moisture:
To reduce the risk of fire or electrical shock, do not expose the unit to moisture or use in damp or wet conditions. Do not place container of liquid on it.
Heat:
Do not locate the unit in a place close to excessive heat or direct sunlight, as this could be a fire hazard.
Locate the unit away from any equipment, which produces heat such as: power supplies, power amplifiers and
heaters.
Environment:
Protect from excessive dirt, dust, heat, and vibration when operating and storing. Avoid tobacco ash, drink
spillage and smoke especially that associated with smoke machines.
Handling:
Protect the controls from damage during transit. Use adequate padding if you need to ship the unit. To avoid
injury to yourself or damage to the equipment take care when lifting, moving or carrying the unit.
Servicing:
Switch off the equipment and unplug the power cord immediately if it is exposed to moisture, the power cord or
plug becomes damaged during a lightning storm or if smoke odor or noise is noted. Refer servicing to qualified
technical personnel only.
Installation:
Install the unit in accordance with the instruction printed in the user guide.
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, rugged 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 Equalizers 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
Switching _ (High Slider Resolution +/-12dB _ or
Normal Resolution (+/-6dB), active balanced and
unbalanced input/output connectors, and RFI
filtering.
A passive Bypass switch allows for direct comparison 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 connectors 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 rugged. 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 performance.
GENERAL INFORMATION
Congratulations on the purchase of your new ART equalizer. This professional equalizer is perfect for
virtually any audio application where frequency tailoring is needed. It’s features include: constant Q
circuitry with accurate center frequencies, selectable 6dB or 12dB range, active balanced and unbal-
anced 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. The unit also features automatic relay bypass of audio if power to the unit
is lost or too low. Rugged construction and solid audio performance make these equalizers particu-
larly well suited to fixed installation as well as touring live sound systems.
INSTALLATION
This series of 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 1.75 inches for the
HD131 and HD215, and 3.5 inches for the HD231. The depth is 7 inches.
POWER CONNECTORS
These equalizers have internal power supplies and are designed for operation with 120 or 240 volt
(as determined by the rear fuse block orientation), 50-60Hz mains supply. In new installations and
portable sound systems, or any situation where the mains power is in question, it is wise to confirm
the voltage and select the appropriate line voltage setting BEFORE connecting the equalizer to power
sources.
INPUT/OUTPUT CONNECTIONS
The HD series graphic equalizers have 3 sets of input and output connectors wired in parallel: XLR,
1/4" phone, and Euroblock barrier strip 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.
1/4" Phone connections may be used balanced or unbalanced. When balanced, the tip is High (+),
the ring is Low (-) and the sleeve is ground. To use unbalanced use a mono _” phone cable, this will
automatically ground the ring to the sleeve.
EUROBLOCK CONNECTIONS
Insert the wires, and then snug down with the set screw. The entire barrier strip can be removed for
quick service without disconnecting the individual wires.
SIGNAL LEVELS
Signal levels from -10dBu to +4dBu are considered normal with maximum levels of approximately
+22dBu balanced or +16dBu unbalanced. Do not connect microphones directly to the equalizer. Most
Microphones, as well as instrument pickups, require a preamp to get the signal level up to a line level.
The outputs of the equalizer are also designed to connect into line level inputs and should not be
connected into sensitive Microphone or Instrument Inputs for best results.
CHASSIS GROUNDING
The equalizers are equipped with a rear panel Ground Lift switch. This should normally be set to the
Ground position. After set up, if your system exhibits excessive hum or buzzing, the problem may be
a due to a ground differential between your equalizer and other equipment in the same system. The
Ground Lift switch lets you try several combinations to minimize system hum.
NOTE: ALWAYS TURN YOUR AMPLIFIERS DOWN BEFORE CHANGING GROUNDS.
Try different combinations of lifting grounds on units that are supplied with ground lift switches or
make sure all chassis are connected to earth ground, either through the AC Power cord ground or by
the front panel rack mount screws.
If the HD series equalizer is mounted in a grounded rack of equipment, the ground to the case of the
equalizer may be lifted to prevent multiple ground paths, which may cause a ground loop to occur.
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