Art EQ341, EQ355, EQ351 User Manual
EQ300 Series
Graphic Equalizers
EQ341
EQ351
EQ355
DUAL CHANNEL 15-BAND 2/3 OCTAVE EQUALIZER
SINGLE CHANNEL 31-BAND 1/3 OCTAVE EQUALIZER
DUAL CHANNEL 31-BAND 1/3 OCTAVE EQUALIZER
USER'S GUIDE
IMPORTANT SAFETY INSTRUCTIONS – READ FIRST
This symbol, wherever it appears, This symbol, wherever it appears, alerts you
alerts you to the presence of uninsulated to important operating and maintenance
dangerous voltages inside the enclosure that instructions in the accompanying literature.
may be sufficient to constitute a risk of shock. Please read the 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
Only connect the unit to mains power 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 rain, moisture or use in damp or wet
conditions. Do not place container of liquid on it, which may spill into any openings
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, spilled liquid or
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.
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IMPORTANT SAFETY INSTRUCTIONS – READ FIRST
.................................................................2
OVERVIEW
GENERAL INFORMATION
INSTALLATION..............................................................................................................................................5
POWER CONNECTORS ...............................................................................................................................5
INPUT/OUTPUT CONNECTIONS..................................................................................................................5
SIGNAL LEVELS............................................................................................................................................5
CHASSIS GROUNDING ................................................................................................................................6
INITIAL SETUP..............................................................................................................................................6
OPERATION
FRONT PANEL CONTROLS
POWER SWITCH .......................................................................................................................................7
FILTER LEVEL CONTROLS.......................................................................................................................7
FILTER RANGE SWITCH & INDICATORS.................................................................................................7
BYPASS SWITCH & CLIP INDICATOR LED..............................................................................................7
HI PASS FILTER (LOW-CUT FREQUENCY CONTROL) (EQ351 and EQ355 only).................................8
.....................................................................................................................................................................4
..................................................................................................................................5
..................................................................................................................................................................7
...........................................................................................................................7
LOW PASS FILTER (HIGH-CUT FREQUENCY CONTROL) (EQ351 and EQ355 only)............................8
LEVEL CONTROL ......................................................................................................................................8
REAR PANEL CONNECTORS & CONTROLS
POWER CORD...........................................................................................................................................9
FUSE HOLDER, LINE VOLTAGE SWITCH & GROUNDING SCREW........................................................9
GROUND LIFT SWITCH.............................................................................................................................9
INPUT/OUTPUT CONNECTORS .............................................................................................................10
APPLICATIONS
WARRANTY INFORMATION
Limited Warranty.......................................................................................................................................13
Exclusions.................................................................................................................................................13
SERVICE
........................................................................................................................................................................14
SPECIFICATIONS
.........................................................................................................................................................12
............................................................................................................................13
....................................................................................................................................................15
...................................................................................9
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OVERVIEW
The ART EQ300 Series of graphic equalizers have been designed and engineered to
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 important.
Active Filter Sections
The EQ300 Series of graphic equalizers feature
active filter sections, which incorporate a constantQ 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 EQ300 Series of graphic equalizers utilize
20mm precision slide potentiometers. These
center-detented, precision faders are graphically
positioned on ISO center frequencies between
25Hz-16kHz for the EQ341, 20Hz to 20kHz for the
EQ351 and EQ355.
Independent Variable Hi and Low Pass Filtering
In order to deliver superlative performance and
control, the EQ351 and EQ355 graphic equalizers
incorporate 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, allows 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 EQ300 Series.
Additional Controls and Indicators
The EQ300 Series of graphic equalizers utilize a
variable output level control, clip level indicator,
ground lift switch, and selectable line voltage.
A passive bypass switch allows for direct
comparison between the equalized and nonequalized signal for each channel.
Multiple Connectivity
The EQ300 Series of graphic equalizers can be
connected with a wide variety of audio devices.
Each unit has three sets of input and output
connectors wired in parallel. These connections
include XLR connectors, 1/4" phone jacks and RCA
phono jacks.
Durability by Design
The EQ300 Series of 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 EQ341 and EQ351, and 3.5
inches for the EQ355. The depth is 7 inches,
exclusive of power cord.
Rugged construction and solid audio performance
make these equalizers particularly well suited to
fixed installation as well as touring live sound
systems.
Precision and Quality
When considering quality equalization, the ART
EQ300 Series of graphic equalizers are an
excellent choice. They deliver extremely precise,
powerfully flexible and simply great sounding
equalization, with the quality features and reliable
design necessary for top-level audio performance.
Additional features include selectable scale
switching - high slider resolution (±12dB) or normal
resolution (±6dB), active balanced and unbalanced
input/output connectors, and RFI filtering.
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GENERAL INFORMATION
Your ART equalizer is a professional quality unit 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 unbalanced input and output
connectors, RFI filters, independent variable Hi Pass (low cut) and Low Pass (high cut) filters (for the
EQ351 and EQ355), variable input level control, passive bypass switch, clip level indicator, ground lift
switch, and selectable line voltage. Rugged construction and solid audio performance make these
equalizers particularly 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
EQ351 and EQ341, and 3.5 inches for the EQ355. The depth is 7 inches, exclusive of the power
cord.
POWER CONNECTORS
These equalizers have internal power supplies and are designed for operation with 120 or 240 volt
(as determined by the rear panel line voltage switch), 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 EQ300 series graphic equalizers have three sets of input and output connectors wired in parallel:
1/4" phone, XLR, and RCA connectors. Only one of the three inputs should be used per channel. Any
combination of output connectors may be used.
1/4" phone jack 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 1/4” phone cable,
which will automatically ground the ring to the sleeve.
XLR connections are balanced where pin 2 is High (+), pin 3 is Low (-), and pin 1 is Ground.
RCA jack connections are unbalanced.
SIGNAL LEVELS
Signal levels from -10dBm to +4dBm are considered normal with maximum levels of approximately
+18dBm balanced or +22dBm 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.
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