Nady Systems GEQ 231, GEQ 215LF, GEQ131, GEQ 131LF, GEQ 215 User Manual
OWNER’S MANUAL
OWNER’S MANUAL
GEQ 131/ 131LF
Single Channel 31 Band Graphic Equalizer
GEQ 215/ 215LF
2 Channel 15 Band Graphic Equalizer
GEQ 231
2 Channel 31 Band Graphic Equalizer
GEQ 131LF
20 31.5 50 100 200 500 1.25K 2.5K 6.3K 12.5K25 40 80 160 400 1K 2K 5K 10K63 125 315 800250 630 1.6K 4K3.15K 8K 16K 20K
10
+12
+6
+3
5
0
40
-3
15
-6
0
-12
HI PASS
LEVEL
GEQ 131LF
31 BAND GRAPHIC EQUALIZER
15K
BYPASS
3K 50K
LOW PASS
22K7K
RANGE
CLIP –6 –12
60
25010
POWER
ON
OFF
Contents
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GRAPHIC EQUALIZER SERIES
Congratulations!
You have just purchased one of the finest graphic
equalizers on the market today. This EQ was developed using the expertise of professional sound engineers and working musicians. You will find your new
NADY AUDIO EQ has superior performance and
greater flexibility than any other graphic equalizer in its
price range.
Read this manual carefully to get the most out of your
new EQ. Thanks for selecting NADY AUDIO for your
choice in graphic equalizers.
Date of Purchase__________________________
Dealer’s Name____________________________
City_____________________________________
State___________ Zip______________________
Model#__________________________________
Serial #__________________________________
FEATURES............................................................................................................................................3
WARNING..............................................................................................................................................3
INSTALLATION......................................................................................................................................4
Input/Output Connections ............................................................................................................4
Power Connection ......................................................................................................................4
Precautions..................................................................................................................................5
Signal Levels ..............................................................................................................................5
Chassis Grounding......................................................................................................................5
OPERATING INSTRUCTIONS..............................................................................................................5
FRONT P ANEL CONTROLS AND CONNECTIONS ............................................................................6
REAR PANEL CONTROLS AND CONNECTIONS ..............................................................................7
TYPICAL SET-UP..................................................................................................................................8
Sound Reinforcement Applications..............................................................................................8
Musical Instrument Application................................................................................................. ...8
Studio Applications......................................................................................................................8
SPECIFICATIONS ................................................................................................................................9
• GEQ 131: 1 Channel, Single Rack Space, 31—1/3rd Octave
Bands
• GEQ 131LF: 1 Channel, Double Rack Space, 31—1/3rd
Octave Bands, Long Throw Faders (60mm travel)
• GEQ 215: 2 Channel, Single Rack Space, 15—2/3rd Octave
Bands Each Channel
• GEQ 215LF: 2 Channel, Double Rack Space, 15—2/3rd
Octave Bands Each Channel, Long Throw Faders (60mm
travel)
• GEQ 231: 2 Channel, Double Rack Space, 31—1/3rd Octave
Bands Each Channel
• Active balanced (XLR and 1/4" TRS) and unbalanced (RCA)
input/output connectors
• Constant Q bandwidth from each filter with a 3% center
frequency accuracy
• Parallel filter design for minimal phase distortion
• Ultra low-noise circuitry
• Variable low-cut and low pass filters, 12dB/octave (GEQ 131/
131LF/GEQ 231), switchable filters (GEQ 215LF)
• Selectable range 6dB or 12dB
• Variable input level control
• Equalizer ON/OFF bypass switch
• Peak (overload threshold) LED
• Internal power supply with AC input and selectable line
voltage (110-240VAC, 50/60Hz)
• Ground lift switch
• Power off automatic bypass function
FEATURES WARNING
An equilateral triangle enclosing a
lightening flash/arrowhead symbol is
intended to alert the user to the
presence of uninsulated "dangerous
voltage" within the product’s enclosure, which may be of sufficient
magnitude to constitute a risk of
electric shock.
An equilateral triangle enclosing an
exclamation point is intended to alert
the user to the presence of
important operating and service instructions in the literature enclosed
with this unit.
CAUTION! TO REDUCE THE RISK OF FIRE, RE
PLACE ONLY WITH SAME TYPE FUSE.
ATTENTION! UTILISER UN FUSIBLE DE RECHANGE DE
MEME TYPE.
WARNING! TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK. DO NOT EXPOSE
THIS PRODUCT TO RAIN OR MOISTURE.
DO NOT REMOVE CHASSIS (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
PERSONNEL.
3
GEQ 131/131LF
Single Channel 31 Band Graphic Equalizers
GEQ 215/215LF
2 Channel 15 Band Graphic Equalizers
GEQ 231
2 Channel 31 Band Graphic Equalizer
Graphic Equalizer GEQ Series
POWER
10
+12
+6
-6
+3
-3
0
-12
0
LEVEL
5
31 BAND GRAPHIC EQUALIZER
GEQ 131LFGEQ 131LF
OFF
ON
BYPASS
CLIP –6 –12
RANGE
40
60
15
25010
HI PASS
15K
22K7K
3K 50K
LOW PASS
20 31.5 50 100 200 500 1.25K 2.5K 6.3K 12.5K25 40 80 160 400 1K 2K 5K 10K63 125 315 800250 630 1.6K 4K3.15K 8K 16K 20K
To ensure years of enjoyment from your NADYAUDIO graphic equalizer, please read and understand
this manual thoroughly before using the unit.
These five equalizer models are each designed for
mounting in a standard 19" equipment rack or one of
the many rack type portable cases available on the
market. The units are either single rack (1.75") or
double rack (3.5") as noted. All five models are 8.66
inches deep.
Install the equalizer in a rack with the rack screws
provided. Route the A.C. power cord to a convenient
power outlet away from audio lines. The unit may be
turned on and off from the front panel power switch or
a master equipment power switch. Since the unit
draws a relatively small amount of current during idle,
the unit may be left on continuously. NADY AUDIO
equalizers do not generate an unduly large amount of
heat and do not need to be specially ventilated or
cooled. The units should not be subjected, however,
to high heat environments.
Although the unit’s chassis is shielded against radio
frequency (RF) and electromagnetic interference
(EMI), extremely high fields of RF and EMI should be
avoided.
Paralleling inputs and outputs may be accomplished
by using any of the 3 connectors.
Note: The 1/4" TRS are normally used for this
function.
INSTALLATION
4
VOLTAGE SELECTOR
Europe (except UK): 230V, 50Hz
UK and Australia: 240V, 50Hz
USA and Canada: 120V, 60 Hz
For other areas, please check with
local authorities.
If the voltage selector is not set for your area:
Confirm that the power cord is not plugged into a wall
outlet. Move the voltage selector switch with a small
screwdriver so that the marker is set to the voltage
for your area.
The 1/4" phone jack, RCA jack, and XLR connector
inputs and outputs can be used for balanced and
unbalanced connections. CAUTION: Using more
than one connector at a time for the INPUT/OUTPUT
pair could unbalance balanced lines, cause phase
cancellation, short a conductor to ground, or cause
damage to the other equipment connected to the
equalizer.
Input/Output Connections
For unbalanced operation,
wire the connectors as follows:
Each of these five NADY AUDIO graphic equalizers is
designed for operation from 120-240 volts, 50-60 Hz
AC supplies. Power requirements for electrical
equipment differ from area to area. In new installations and portable sound systems, or any situation in
which the AC power is in question, it is wise to
confirm the voltage and select the appropriate line
voltage switch before connecting the instrument to
power sources.
Check to see that the unit is set to the voltage for
your area by referring to the table below:
Power Connection
115V 230V
120V 240V
For balanced connection,
wire the connectors as follows:
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