Nady Systems Stereo Equalizer GEQ 131 User Manual

20  
25  
31.5  
40  
50  
63  
80  
100  
125  
160  
200  
250  
315  
400  
500  
630  
800  
1K 1.25K 1.6K 2K 2.5K 3.15K 4K  
5K 6.3K  
8K  
10K 12.5K 16K 20K  
+12  
+6  
+3  
0
10  
GEQ 131LF  
5
31 BAND GRAPHIC EQUALIZER  
ON  
40  
15K  
-3  
BYPASS RANGE  
60 7K  
22K  
15  
-6  
OFF  
10  
250 3K  
HI PASS  
50K  
POWER  
-12  
0
LOW PASS  
CLIP  
–6 –12  
LEVEL  
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  
OWNER’S MANUAL  
 
FEATURES  
WARNING  
GEQ 131/131LF  
Single Channel 31 Band Graphic Equalizers  
20  
25  
31.5  
40  
50  
63  
80  
100  
125  
160  
200  
250  
315  
400  
500  
630  
800  
1K 1.25K 1.6K 2K 2.5K 3.15K 4K  
5K 6.3K  
8K  
10K 12.5K 16K 20K  
+12  
+6  
+3  
0
10  
GEQ 131LF  
5
31 BAND GRAPHIC EQUALIZER  
ON  
40  
15K  
-3  
BYPASS RANGE  
6
0
7
K
22K  
15  
-6  
OFF  
CAUTION!  
TO REDUCE THE RISK OF FIRE, RE  
PLACE ONLY WITH SAME TYPE FUSE.  
UTILISER UN FUSIBLE DE RECHANGE DE  
MEME TYPE.  
10  
250 3K  
HI PASS  
50K  
POWER  
-12  
0
LOW PASS  
CLIP  
–6 –12  
LEVEL  
ATTENTION!  
GEQ 215/215LF  
2 Channel 15 Band Graphic Equalizers  
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.  
GEQ 231  
2 Channel 31 Band Graphic Equalizer  
Graphic Equalizer GEQ Series  
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)  
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 enclo-  
sure, which may be of sufficient  
magnitude to constitute a risk of  
electric shock.  
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  
An equilateral triangle enclosing an  
exclamation point is intended to alert  
the user to the presence of  
important operating and service in-  
structions in the literature enclosed  
with this unit.  
• 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  
3
 
INSTALLATION  
Power Connection  
To ensure years of enjoyment from your NADY AU-  
DIO graphic equalizer, please read and understand  
this manual thoroughly before using the unit.  
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 installa-  
tions 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.  
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.  
Check to see that the unit is set to the voltage for  
your area by referring to the table below:  
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.  
VOLTAGE SELECTOR  
Europe (except UK): 230V, 50Hz  
115V  
120V  
230V  
240V  
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:  
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.  
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.  
Input/Output Connections  
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.  
For balanced connection,  
For unbalanced operation,  
wire the connectors as follows:  
wire the connectors as follows:  
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.  
4
 
Precautions  
Protecting yourself from electric shock:  
• Never touch the plug with wet hands.  
Before starting to equalize your sound system there  
is some information you should know and procedures  
you should follow:  
• Always pull out by the plug and never the cord.  
• Only let a qualified professional repair the  
equipment. An unauthorized person might touch the  
internal parts and receive a serious electric shock.  
• Never allow a child to put anything, especially  
metal, into the equipment.  
• These NADY AUDIO equalizers are equipped  
with a BYPASS switch with an LED indicator. If  
you disable the BYPASS switch, the LED will turn  
off and all equalization settings will be restored. In  
bypass mode, the audio signal will flow through  
at unity gain.  
• Use the range selection switch to select between  
a 6db or 12dB level adjust range. The dual color  
range LED will indicate green for 6dB and red for  
12dB.  
Protecting your NADY AUDIO Graphic Equalizer:  
• Use only a household AC power source. Never use  
a DC power source.  
• If water is spilled on or in the unit, unplug it and call  
for service.  
• Make sure that the equipment is well ventilated and  
away from direct sunlight  
• Avoid damage to the internal circuits and the  
external surface by keeping the unit away from  
sources of high heat.  
• Avoid using spray type insecticide or solvents  
near the equipment. It can damage the finish an  
might ignite suddenly  
• The input level control allows adjustment between  
OFF (center detent) and +/-6dB. Note: The unit is  
equipped with a red overload LED, which  
illuminates when the signal reaches 5dB prior to  
clipping. It is normal for the overload LED to flash  
occasionally, but if the overload LED is on steady  
you must readjust the level control. Below are  
some tips to follow while doing the initial set-up.  
To avoid damaging the finish, never use denatured  
alcohol, paint thinner or other similar chemicals to  
clean 6 the equipment.  
• Place the unit on a flat and solid surface or in a  
rack.  
To enjoy your NADY AUDIO graphic equalizer for a  
long time, please read this owner’s manual  
thoroughly.  
1. Set channel levels to the center detent (0dB-unity  
gain) on the front panel.  
2. Enable the BYPASS switch (Note: The red LED is  
ON).  
3. Set all slide controls to the center detent or 0dB  
(unity gain) position.  
4. Select the 6dB range switch (green LED ON).  
5. Apply signal to the system.  
6. Disable the BYPASS switch, red LED OFF.  
7. If the CLIP (overload) LED is on you must turn  
down the level control.  
8. You may now start equalizing your system.  
9. Switch the range switch to 12dB (red LED is lit) if  
the 6dB range does not provide sufficient gain.  
Signal Levels  
Signal levels from -18dBu to +18dBu are considered  
normal. Do not directly connect microphones into the  
equalizers. Microphones require a pre amp.  
Chassis Grounding  
NADY AUDIO equalizers are equipped with a rear  
panel ground lift switch. If, after setting up your  
system, the system exhibits excessive hum or  
buzzing, the problem may be that there is a ground  
incompatibility between your equalizer the other  
equipment in the same system. There are several  
combinations that can be attempted. Note: ALWAYS  
TURN YOUR AMPLIFIERS DOWN BEFORE  
CHANGING YOUR GROUNDS AROUND. Try  
different combinations of lifting grounds with the  
ground lift switches or make sure all chassis are  
connected to earth ground, either through the A.C.  
power cord ground or by the front panel rack mount  
screws.  
5
 
FRONT PANEL CONTROLS AND CONNECTIONS  
GEQ 131/131LF  
Single Channel 31 Band Graphic Equalizers  
6
4
8
3
5
1
7
2
20  
25  
31.5  
40  
50  
63  
80  
100  
125  
160  
200  
250  
315  
400  
500  
630  
800  
1K 1.25K 1.6K 2K 2.5K 3.15K 4K  
5K 6.3K  
8K  
10K 12.5K 16K 20K  
+12  
+6  
+3  
0
10  
GEQ 131LF  
5
31 BAND GRAPHIC EQUALIZER  
ON  
40  
15K  
-3  
BYPASS RANGE  
6
0
7
K
22K  
15  
-6  
OFF  
10  
250 3K  
50K  
POWER  
-12  
0
HI PASS  
LOW PASS  
CLIP  
–6 –12  
LEVEL  
6
4
2
3
8
7
1
5
GEQ 215/215LF  
2 Channel 15 Band Graphic Equalizers  
6
4
6
4
1
7
7
2
2
5
5
4
5
1
4
5
7
7
2
2
6
6
3A  
8A  
3A  
8A  
GEQ 231  
2 Channel 31 Band Graphic Equalizer  
4
1
3
8
6
7
2
5
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.  
5. In/Out Bypass Switch & Indicator  
This switch inserts or removes the equalizer channel from the  
signal path. The red LED lights when the switch is depressed to  
indicate that the unit or channel is in the equalizing mode. In the  
bypass mode, the signal is routed from the input directly to the  
output. The bypass function is FET switched to prevent switching  
transients when inserting the equalizer into the circuit path. Use  
this switch to compare equalized and unequalized material. When  
there is no power to the unit, the equalizer automatically reverts  
to bypass.  
2. Input Level Control  
This controls the level of signal to the equalizer. It is capable  
of +/- 6dB of gain.  
This control is used to adjust for variation in input level to the  
equalizer channel, or to compensate for the equalization  
applied to the input signal. Turn this control down if the CLIP  
LED illuminates steady (meaning too strong an input signal).  
Unity gain can be set by turning this knob to its center detent  
position.  
6. Peak/Clip Indicator  
This red LED illuminates if any section of the equalizer is within  
5dB of clipping. Occasional blinking 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.  
3. Low-Cut/High-Pass Filter (GEQ 131/131LF/231)  
These equalizers are equipped with a 10Hz, 12dB/octave,  
variable Low Cut/High-Pass Filter (HPF) to cut down unwanted  
low frequency signal. Because of its high roll-off slope, the HPF  
can be efficiently used to attenuate the "HUM" noise from preced-  
ing instruments, or to prevent the low frequency resonance that  
can occur when speakers are installed in an enclosed acoustic  
environment.  
7. Filter Level Slider Controls  
Each one of these linear potentiometers will boost or cut its noted  
frequency by either +/-6dB or +/-12dB depending on the filter  
range selected. When all of the sliders are in center detented  
position, the output of the equalizer is flat. Each slider is marked  
with the center frequency of its band pass filter.  
8. Low-Pass/High-Cut Filter (GEQ 131/131LF/231)  
This filter rolls off higher frequencies. This is useful for reducing  
hiss or sibilance from a signal. Its range is adjustable from 3KHz  
to 50KHz.from 3KHz to 50KHz.  
3A. High-pass Filter Switch and Indicator (GEQ 215/215LF)  
40 Hz, 12dB/octave HPF. LED lights when activated.  
4. 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 12 dB the red LED will illuminate.  
8A. Low-Pass Filter Switch and Indicator (GEQ 215/215LF)  
16KHz, 12 dB/octave LPF. LED lights when activated.  
6
 
REAR PANEL CONTROLS AND CONNECTIONS  
10  
9
GEQ 131/131LF  
Single Channel 31 Band Graphic Equalizers  
12  
11  
9
13  
10  
12  
10  
11  
9
13  
GEQ 215/215LF  
2 Channel 15 Band Graphic Equalizers  
12  
11  
9
13  
13  
10  
12  
11  
9
13  
13  
GEQ 231  
2 Channel 31 Band Graphic Equalizer  
10  
12  
11  
13  
9. IEC Power Cord Receptacle  
This is used to connect the AC power source to your equalizer.  
Power requirements: 115/230VAC, 50/60Hz  
13. Input/Output Connectors  
See INPUT/OUTPUT CONNECTIONS section (page 2) for  
proper wiring of the XLR, 1/4" TRS and RCA connectors for  
desired active balanced or unbalanced operation.  
10. AC Voltage Selector  
Set this slide switch to match your line voltage supply.  
CAUTION: For new installations and portable sound systems, or  
in any situation in which the AC power is suspect, it is wise to  
confirm appropriate voltage and line polarity BEFORE connecting  
the instrument to the power source.  
Paralleling inputs and outputs may be accomplished by using any  
of the 3 connectors. Note: The 1/4" TRS connectors are normally  
used for this function.  
Note: while you can use any input connector with any output con-  
nector, only one of these connectors is to be used at a time.  
11. Fuse Holder  
This fuse holder contains an AC primary fuse. This fuse should  
be replaced with the same type fuse when this is blown out. If  
they continuously blow, stop replacing the fuse and refer  
servicing to qualified personnel.  
CAUTION: After checking the AC supply voltage, be sure that  
the correct fuse is in the fuse holder: 0.5 Amp for 100-130VAC  
and for 220-240V AC.  
12. Ground-Lift Switch  
This switch is used to disconnect the signal ground from the AC  
power and chassis earth ground. This switch should be put in the  
LIFT position if the speakers produce humming sounds caused  
by a ground loop.  
7
 
TYPICAL SETUP  
NADY AUDIO graphic equalizers may be used wher-  
ever 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.  
INSTALLATION  
TYPICAL SET-UP  
Sound Reinforcement Applications  
By routing the signal from the mixer to the main  
power amplifiers (or crossover), the overall frequency  
of the mix may be altered to do a number of things.  
A. Through the use of a real-time audio spectrum  
analyzer, a calibrated microphone, and a pink  
noise source, the audio system may be "TUNED"  
to make the overall audio spectrum response of  
the audio reinforcement system and the room  
environment flatter in its frequency response.  
B. By turning up the audio reinforcement system to  
the feedback point, then attenuating the oscillating  
frequency (1/3 octave resolution), then turning  
the system up to attenuate the 2nd oscillating  
frequency, and then the 3rd, and so on, you can  
enable the entire audio system to have much  
more gain before feedback.  
C. Amplifiers and speakers may be protected by the  
use of the LOW CUT feature of the equalizer.  
Wind noise or the loud percussive sound of  
dropped microphones, etc., could potentially  
cause damage to the amps and/or speakers. By  
rolling off the extreme LOW frequencies with the  
LOW CUT filter, a measure of protection is added  
to the system without severely affecting the overall  
sound quality.  
Studio Applications  
A graphic equalizer is one of the most useful tools in  
the sound engineer’s bag. NADY AUDIO equalizers  
offer the features and flexibility to perform where it  
counts in the studio.  
A. Fix a track that doesn’t sound quite right. Put the  
equalizer in an effects send and return it to the  
MIX bus.  
B. Create an artificial stereo by splitting a monaural  
signal and equalizing the split signals differently,  
then panning one equalized signal to the right and  
the other signal to the left.  
C. Shape the sound by changing the frequency  
response of the track.  
D. Special effects, like a telephone sound, can be  
created by cutting off the LOW end to 200Hz and  
the HIGH end to 6KHz.  
E. Also when you use the equalizer with other pieces  
of equipment, such as the NADY AUDIO CL-5000  
Compressor Limiter with Gate, you can do real  
signal processing magic. Emphasizing the HIGH  
frequencies of a signal and feeding the modified  
signal to the side chain of the compressor makes  
the compressor a DE-ESSER; or, emphasizing the  
LOW frequencies and putting that through the side  
chain, makes the compressor a "DE-THUMPER".  
Also, you can reduce unwanted frequency-  
dependent noise in a signal by cutting the  
offending frequencies with an equalizer and letting  
the noise gate of the CL-5000 "KEY" on the  
modified signal, while letting the original signal  
pass and gating the unwanted sounds. (See the  
instruction manual for the NADY AUDIO CL-5000  
for more ideas and detail on methods to utilize  
your equalizer in the fullest).  
D. In noisy environments, the audio signal may be  
tailored for better intelligibility and penetration.  
This is especially useful for public address  
systems.  
E. Creative use of the equalizer allows shaping of the  
signal for a more pleasing sound or for special  
effects. The only limits are those of taste and  
imagiation.  
Musical Instrument Applications  
A. Putting an equalizer in line with a musical  
instrument allows you to modify the sound of the  
instrument. You can brighten the sound, or add  
body to a thin sounding instrument, or even give  
the sound a totally different character.  
B. An equalizer will allow you to eliminate unwanted  
sounds, like a 60-cycle HUM from a badly  
grounded amplifier.  
8
 
SPECIFICATIONS  
Equalizer:  
Equalizer Control Bands  
Frequency Response  
20Hz – 20KHz, +/- 1dB  
THD + Noise  
<0.02% (@ 1KHz, all faders at mid position)  
Signal to Noise Ratio  
93dB (@ 1KHz)  
1X31, 1/3 Octave ISO Spacing From 20Hz to 20KHz  
2X31, 1/3 Octave ISO Spacing From 20Hz to 20KHz  
2X15, 2/3 Octave ISO Spacing From 25Hz to 16KHz  
Filter Type  
Constant Q  
Slider Travel  
Channel Separation  
60dB (1KHz)  
Line Voltage  
100-130V AC, 50/60Hz  
200-240V AC, 50Hz  
Power Consumption  
Maximum: 15 watts  
20mm (Center Detent) for GEQ 131/215/231  
60mm (Center Detent) for GEQ 131LF/215LF  
Level Control Range  
+/-6dB or +/-12dB (Selectable)  
Inputs:  
Type  
Size:  
Active Balanced/Unbalanced  
19"W X 3.5"H X 8.66"D (2U)  
(48.2cm X 8.8cm X 22.0cm) For GEQ 131LF/  
215LF/231  
Connectors  
3-P XLR, 1/4" TRS (Balanced), RCA (Unbalanced)  
Impedance  
20K Ohms Balanced; 15K Ohms Unbalanced  
Maximum Level  
+/-18dBV  
19"W X 1.75"H X 8.66"D (1U)  
(48.2cm X 4.4cm X 22.0cm) For GEQ 131/215  
Weight:  
Outputs:  
Type  
Active Balanced/Unbalanced  
Connectors  
3-P XLR, 1/4" TRS (Balanced). RCA (Unbalanced)  
Impedance  
6.16lbs. (2.8Kg.)  
6.38lbs. (2.9Kg.)  
7.04lbs. (3.2Kg.)  
7.7lbs. (3.5Kg.)  
GEQ 215  
GEQ 131  
GEQ 131LF  
GEQ 215LF  
11.44 lbs. (5.2Kg.) GEQ 231  
Typically < 600 Ohms  
Maximum Level  
+/-16dBV  
For improvement purposes, all specifications and  
design are subject to change without notice  
Clip LED Threshold  
5dB (Below Clipping)  
Low Cut (High Pass) Filter  
(GEQ 131/131LF/231)  
10Hz to 250Hz (12dB/Octave), variable  
(GEQ 215LF)  
40Hz (12dB/Octave), switchable  
Low Pass (High Cut) Filter  
(GEQ 131/131LF/231)  
3KHz to 50KHz (12dB/Octave), variable  
(GEQ 215LF)  
16KHz (12dB/Octave), switchable  
9
 
NOTES  
 
SERVICE FOR YOUR NADY AUDIO PRODUCT  
(U.S.) Should your NADY AUDIO Product require service,  
please contact the Nady Service Department via phone at  
(510) 652-2411 or E-mail at [email protected].  
(INTERNATIONAL) For service, please contact the NADY  
AUDIO distributor in your country through the dealer from  
whom you purchased this product.  
DO NOT ATTEMPT TO SERVICE  
THIS UNIT YOURSELF AS IT CAN  
BE DANGEROUS AND ALSO WILL  
VOID THE WARRANTY.  
NADY SYSTEMS, INC. • 6701 SHELLMOUND STREET EMERYVILLE, CA 94608  
Tel: 510.652.2411 • Fax: 510.652.5075 • www.nadywireless.com  
 

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