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441 DUAL CHANNEL 15 BAND 2/3 OCTAVE GRAPHIC EQUALIZER
451 SINGLE CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER
455 DUAL CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER
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The new ART 400 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 400 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.
Additional Controls and Indicators
The 400 Series of Precision Graphic Equalizers
utilize a variable input level control, clip level
indicator, ground lift switch, and selectable line
voltage.
Precision Slide Potentiometers
The 400 Series of Precision Graphic Equalizers
utilize two x thirty-one 20mm oil-damped precision
slide potentiometers. These center-detented,
precision faders are graphically positioned at 1/3octave ISO frequencies between 25Hz-20kHz.
A passive Bypass switch allows for direct comparison between the equalized and non-equalized
signal for each channel.
Additional features include selectable Scale Switching - (High Slider Resolution +/-6dB - or Normal
Resolution (+/-12dB), active balanced and unbalanced input/output connectors, and RFI filtering.
Multiple Connectivity
The 400 Series of Precision Graphic Equalizers are
connectable with a wide variety of audio devices
and each unit has three sets of input and output
connectors wired in parallel. These connections
include XLR, 1/4" phone, and RCA phono connectors.
Independent Variable Hi and Low Pass Filtering
In order to deliver superlative performance and
control, the 400 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 an ART 400 Series
equalizer.
Durability by Design
The 400 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, 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
441 and 451, and 3.5 inches for the 455. The depth
is 7 inches.
Automatic Relay Bypass
The 400 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.
Precision and Quality
When considering quality equalization, the ART
400 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.
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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 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. The unit also features automatic relay bypass of audio 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.
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 441
and 451, and 3.5 inches for the 455. The depth is 7 inches.
POWER CONNECTORS
These equalizers have internal power supplies and are designed for operation from 120 or 240 volt,
50-60Hz mains supply. Power consumption is 7.5 watts. 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 400 series graphic equalizers have 3 sets of input and 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.
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.
RCA connections are always unbalanced.
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SIGNAL LEVELS
Signal levels from -10 dBu to +4 dBu are considered normal with maximum levels of approximately
+19dBu. Do not connect microphones directly to the equalizer. Microphones require a preamp.
CHASSIS GROUNDING
The equalizers are equipped with a rear panel Ground lift switch. After setting up your system, if the
system exhibits excessive hum or buzzing, the problem may be a ground incompatibility between
your equalizer and other equipment in the same system. There are several combinations that can be
tried. 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 400 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.
OPERATING INSTRUCTIONS
Before starting to equalize your sound system there is some information you should know and procedures you should follow. Your equalizer is equipped with a bypass switch. The bypass switch, when
activated, lights the LED and cancels all equalization settings while allowing signal to flow through the
unit at unity gain.
Also included is a range selection switch with LED indicators, 6dB =green, 12dB= yellow. In addition
to the range selection switch there is an output level control potentiometer. The level control operates
between off and +6dB. Note: If there is too much gain, your equalizer has a red LED Clip indicator
that illuminates when signals are within 4dB of clipping. If the Clip LED flashes occasionally, this is
okay, but if this LED is steadily on you must readjust the level control.
INITIAL SET UP
Here are some tips to help you with the initial set up:
1. Set channel levels to the center detent 0dB on the front panel.
2. Select the Bypass switch to bypass the equalizer (Note: The red LED is on).
3. Set the frequency slide controls to the center detent (or 0dB).
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4. Select the 6dB range switch (Note: The green LED is on).
5. Apply signal to the system.
6. Release the bypass switch (Note: The red LED is off).
7. If the Clip LED is on, you must turn down the input level control.
8.You may now start equalizing your system.
9. If you do not have enough equalization control, switch the range switch to the 12dB setting.
FRONT PANEL CONTROLS
1. POWER SWITCH
To turn the equalizer ON or OFF, press the upper or lower portion of this button. CAUTION: Always
turn on your equalizer BEFORE your power amplifiers are turned on, and always turn off your equalizer AFTER your power amplifiers have been turned off.
2. FILTER LEVEL CONTROLS
Each of these sliders controls the output level of each of the 31 (or 15) bandpass filters. A detent at
the center position helps center the controls for a flat response.
3. FILTER RANGE SWITCH & INDICATORS
The gain range of the filter sliders is switchable (as a group) from +/- 6dB to + /-12dB for maximum
boost/cut capability. At 6dB the green LED will illuminate, and at 12dB the yellow LED will illuminate.
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4. BYPASS SWITCH & CLIP INDICATOR LED
Bypass Switch: When the red LED is illuminated, this indicates that the unit or channel is in
the bypass mode. Signal is routed directly from the input to the output without passing through
any circuit (often referred to as ”hard-wire bypass”). Use this switch to compare equalized and
unequalized material, or to bypass the EQ section in the event of power loss or unit failure.
Clip Indicator: - This red LED illuminates if any section of the equalizer is within 4dB of clipping. Occasional flickering of this LED is acceptable, but if it remains on more than intermittently you should turn down either the equalizer’s level controls or reduce the output level of
the preceding component to avoid audible distortion.
5. HI PASS FILTER (LOW-CUT FREQUENCY CONTROL)
To cut down on unwanted low frequency signals, this control determines the roll-off frequency of the
High-Pass Filter (HPF). The roll-off frequency can be adjusted from 10Hz to 250Hz by turning this
knob. Because of its high roll-off slope, the HPF can be efficiently used to cut down the ”HUM” noise
from preceding instruments, or to reduce low frequency resonances, when speakers are installed in
an enclosed acoustic environment.
6. LOW PASS FILTER (HIGH-CUT FREQUENCY CONTROL)
To cut down on unwanted high frequency signals, this control determines the roll-off frequency of the
Low-Pass Filter (LPF). The roll-off frequency can be adjusted from 3kHz to 40kHz by turning the
knob. Because of its high roll-off slope, the LPF can be effectively used to cut down the high frequency noise from preceding instruments, or roll-off excessive high frequency sounds to obtain a
more natural sound in some acoustic situations.
7. LEVEL CONTROL
This controls the level of signal coming into the equalizer. Turn this control down if the Clip LED
illuminates steadily (meaning too strong an input signal). Unity gain can be set by turning this knob to
the center detent position.
Signal levels should be kept normalized through the equalizer. That is, the signal level, when bypassed, should be the same (or a little lower) than when active. The reason for this is if the equalizer
loses power (which causes the unit to go into bypass), the signal will be equal or lower than the active
eq gain. This will ensure that a signal with undesirably higher levels will not be passed inadvertently.
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REAR PANEL CONNECTORS & CONTROLS
8. POWER CORD
This cord is used connect the AC power source to your equalizer. CAUTION: Equipment for USA
installation includes a power cord with a three pin polarized plug. DO NOT REMOVE THE CENTER
GROUNDING PIN.
9. FUSE HOLDER
This fuse holder contains the AC primary fuse. This fuse should be replaced with the same type fuse
if it is blown. If they continuously blow, stop replacing fuses and refer servicing to qualified personnel.
CAUTION: After checking the AC supply voltage, be sure that the correct fuse is in the fuse holder 0.5Amp for 95-125VAC, as well for 220-240VAC.
10. AC VOLTAGE SELECTOR
Set this slide switch to match your line voltage supply. CAUTION: For new installations and portable
sound systems, or any situation in which the mains power is suspect, it is wise to confirm appropriate
voltage and line polarity BEFORE connecting the instrument to power source.
11. GROUND LIFT SWITCH
This switch is used to disconnect signal ground from the mains and chassis earth ground. You may
set the switch to the LIFT position if ”Hum”, caused by a ground loop, can be heard at the speakers.
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12. INPUT/OUTPUT CONNECTORS
1/4 TRS
The TRS (Tip Ring Sleeve) connector is balanced and wired as tip = Hi (+), Ring = Lo (-), and Sleeve
= Ground.
CAUTION: Only one of these sockets should be chosen for audio connection at the same time.
XLR
The XLR input connector is balanced and wired as Pin 2=Hi (+), Pin 3=Lo (-), and Pin 1=Ground.
CAUTION: Only one of these sockets should be chosen for audio connection at the same time.
RCA PHONO
The RCA Phono input is unbalanced at the tip = Hi (+) and the Sleeve = Ground.
CAUTION: Only one of these sockets should be chosen for audio connection at the same time.
FOR BALANCED CONNECTIONS
Wire the connectors as follows:
Phone Jack
Connection
tip
=
high
ring
=
low
sleeve
=
ground
FOR UNBALANCED CONNECTIONS
Use 1/4 inch tip-ring-sleeve or mono phone plug connectors or RCA phone jack connectors wired as
follows:
Phone Jack
Connection
tip
=
high
ring
=
no connection
sleeve
=
ground
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APPLICATIONS
Graphic equalizers may be used wherever modification of the frequency contour of a sound system is
needed. A graphic equalizer is a solution to any number of sound problems or creative urges.
Typical reinforcement application of
a two channel equalizer
Equalizaton of audio signals from a
mixer
Return
Mixer
P Amp
Speaker
P Amp
Speaker
EQ
Mixer
EQ
Send
Equalization of a musical instrument
Equalization of a guitar effects loop
Guitar
Amp
Amp
Instrument
EQ
Amp
PreAmp
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Stereo
Effects
loop
EQ
Amp
WARRANTY INFORMATION
Limited Warranty
Applied Research and Technology will provide warranty and service for this unit in accordance
with the following warrants:
Applied Research and Technology, (A R T) warrants to the original purchaser that this product
and the components thereof will be free from defects in workmanship and materials for a period of one year from the date of purchase. Applied Research and Technology will, without
charge, repair or replace, at its option, defective product or component parts upon prepaid delivery to the factory service department or authorized service center, accompanied by proof of
purchase date in the form of a valid sales receipt.
Exclusions
This warranty does not apply in the event of misuse or abuse of the product or as a result of
unauthorized alterations or repairs. This warranty is void if the serial number is altered, defaced, or removed.
A R T reserves the right to make changes in design or make additions to or improvements
upon this product without any obligation to install the same on products previously manufactured.
A R T shall not be liable for any consequential damages, including without limitation damages
resulting from loss of use. Some states do not allow limitations of incidental or consequential
damages, so the above limitation or exclusion may not apply to you. This warranty gives you
specific rights and you may have other rights, which vary from state to state.
For units purchased outside the United States, an authorized distributor of Applied Research
and Technology will provide service.
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SERVICE
The following information is provided in the unlikely event that your unit requires service.
1) Be sure that the unit is the cause of the problem. Check to make sure the unit has power
supplied, all cables are connected correctly, and the cables themselves are in working condition.
2) If you find the unit to be at fault, write down a complete description of the problem, including
how and when the problem occurs. Please write down a description of your complete setup before calling Customer Service.
3) Contact our Customer Service department at (585) 436-2720 for your Return Authorization
number or questions regarding technical assistance or repairs. Customer Service hours are
9:00 AM to 5:00 PM Eastern Time, Monday through Friday.
4) Pack the unit in its original carton or a reasonable substitute. The packing box is not recommended as a shipping carton. Put the packaged unit in another box for shipping. Print the
RA number clearly on the outside of the shipping box. Print your return shipping address on
the outside of the box.
5) Include with your unit: a return shipping address (we cannot ship to a P.O. Box), a copy of
your purchase receipt, a daytime phone number, and a description of the problem.
6) Ship only your unit (keep your manual!) to:
APPLIED RESEARCH AND TECHNOLOGY
215 TREMONT STREET
ROCHESTER, NEW YORK 14608
ATTN: REPAIR DEPARTMENT
RA# ____________________
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SPECIFICATIONS:
EQUALIZER
Bands
Type / Accuracy
Travel
Range
Overall Gain Range
INPUTS
Type
Connectors
Impedance
Maximum Level
OUTPUTS
Type
Connectors
Impedance
Maximum Level
RFI filters
Passive Bypass Switches
Overload LED Threshold
High Pass Filter
Low Pass Filter
Frequency Response
THD + Noise
IM Distortion (SMPTE)
Signal to Noise Ratio
Headroom
Dynamic Range
Channel Separation
Common Mode Rejection
2 x 15, 2/3 Octave, ISO Spacing (441)
1 x 31, 1/3 Octave, ISO Spacing (451)
2 x 31, 1/3 Octave, ISO Spacing (455)
Constant Q, 3% Center Frequency
20mm (Positive Center Detent).
+/-6dB or +/-12dB (Selectable)
Off to +6dB (Unbalanced out) Sliders Centered
Off to +12dB (Balanced out) Sliders Centered
Active Balanced/Unbalanced
3-Pin XLR, 1/4” TRS (Balanced), RCA (Unbalanced)
24k Ohms Balanced; 12k Ohms Unbalanced
+19dBm (Level Control at Center)
Active Balanced/Unbalanced
3-Pin XLR, 1/4” TRS (Balanced), RCA (Unbalanced)
Typical <150 Ohms
+19dBm (Balanced) (10k Ohm load)
+13dBm (Unbalanced) (10k Ohm load)
Yes
Yes
4 dB (Below Clipping)
10-250Hz, 12dB/Oct
3k-40kHz, 12dB/Oct
20-20kHz, +/-0.5dB
less than .01% (20Hz-20kHz, 0dBu)
0.005%
greater than 94dB, Ref: 0dBu, (Balanced) (+/-6dB range)
greater than 89dB, Ref: 0dBu, (Balanced) (+/-12dB range)
20Hz - 20kHz, unweighted.
+19dB, Ref, 0dBu, (Balanced) (+/-6dB and +/-12dB range)
greater than 113dB, (Balanced) (+/-6dB range)
greater than 108dB, (Balanced) (+/-12dB range)
greater than 50dB
50:1 typical
LINE VOLTAGE
95-125VAC, 50/60Hz
190-250VAC, 50Hz
INPUT AC POWER
9 Watts (441 and 451), 14Watts (455), typical
CONSTRUCTION
All Steel Chassis
SIZE
1.75” H *19” W *7.0” D (1U) (441 and 451)
(4.45cm * 48.3cm * 21.6cm)
3.5” H *19” W *7.0” D (2U) (455)
(8.9cm * 48.3cm * 21.6cm)
WEIGHT
7.5 Ibs (3.4 kg). (441 and 451)
12 Ibs. (5.4 kg). (455)
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APPLIED RESEARCH & TECHNOLOGY
215 TREMONT STREET
ROCHESTER, NEW YORK 14608 USA
(585) 436-2720 – Voice
(585) 436-3942 – Fax
www.artproaudio.com
E-mail: cserve@artproaudio.com
400 SERIES
model 441 - DUAL CHANNEL 15 BAND 2/3 OCTAVE GRAPHIC EQUALIZER
model 451 - SINGLE CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER
model 455 - DUAL CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER
400 SERIES400-5004-100
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