Nady Systems Stereo Equalizer PEQ 5B User Manual

INPUT/OUTPUT LEVEL(dB)  
-30  
0
-24  
-18  
-12  
-6  
-3  
0
+3  
+6  
10  
+9  
+12  
-5  
+18  
20kHZ-400kHz  
60HZ-1kHz  
150HZ-2.5kHz  
500HZ-8kHz  
1kHZ-20kHz  
BAND  
0.8  
BAND  
BAND  
BAND  
BAND  
1
2
3
4
5
0
110  
0
0.8  
250  
0
0.8  
600  
0
0.8  
1.8  
0
0.8  
4
75  
POWER  
-5  
110  
7
+5  
0.4  
0.1  
1.2  
80  
900 -5 -5  
0.4  
0.1  
OUT 22  
1101.5  
2.7 -5 -5  
4.6  
1.2  
7
6.5  
-5  
1.2  
400  
+5  
50  
25  
OUT 22  
15  
150 -5 -5  
250  
+5  
0.4  
0.1  
1.2160  
350  
+5  
0.4  
0.1  
OUT 22  
+5  
+5  
0.4  
0.1  
22  
-5  
1.4k  
22  
PEQ-5B  
10  
22  
40  
1.6  
80  
550  
-10  
200  
1.6  
0.7  
1.6  
1.5  
1.6  
200  
3.5  
5
Band  
Parametric  
Equalizer  
-10  
-10  
-10  
+10  
+10  
+10  
+10  
+10  
-10  
+10  
-10  
1.6  
OUT 22  
OUT  
IN  
OUT  
-15  
-15  
-15  
2.5k  
-15  
-15  
-15  
+15  
0.03  
OCTAVE  
2
150  
+15  
0.03  
OCTAVE  
2
2.5  
30  
+15  
0.03  
OCTAVE  
2
2.5  
20  
+15  
10  
400  
2.5  
30  
+15  
0.03  
OCTAVE  
2
20  
400  
+15  
0.03  
OCTAVE  
2
60  
1k  
IN  
KHz  
IN  
Hz  
Hz  
dB  
IN  
Hz  
dB  
IN  
kHz  
dB  
IN  
KHz  
dB  
Hz  
dB  
dB  
LEVEL  
AUDIO  
BANDWIDTH FREQUENCY  
LEVEL  
FREQUENCY  
LEVEL  
FREQUENCY  
LEVEL  
AUDIO  
BANDWIDTH FREQUENCY  
LEVEL  
AUDIO  
BANDWIDTH  
FREQUENCY  
INPUT  
AUDIO  
LOW CUT  
HIGH CUT  
AUDIO  
BANDWIDTH  
AUDIO  
BANDWIDTH  
PEQ-5B  
5-BAND PARAMETRIC EQUALIZER  
OWNER’S MANUAL  
 
Warning  
An equilateral triangle enclosing a lightning flash/arrowhead symbol is  
intended to alert the user to the presence of uninsulated dangerous  
voltagewithin the products enclosure which may be of sufficient  
magnitude to constitute a risk of electric shock.  
ATTENTION: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR  
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.  
IMPORTANT SAFETY INSTRUCTIONS  
When using electronic device, basic precautions should always be taken, including the following:  
1. Read all instructions before using the product.  
2. Do not use this product near water (e.g., near a bathtub, washbowl, kitchen sink, in a wet basement, or near a  
swimming pool, etc.).  
3. This product should be used only with a cart or stand that will keep it level and stable and prevent wobbling.  
4. This product, in combination with headphones or speakers, may be capable of producing sound levels that  
could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a  
level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult an  
audiologist.  
5. The product should be positioned so that proper ventilation is maintained.  
6. The product should be located away from heat sources such as radiators, heat vents, or other devices  
(including amplifiers) that produce heat.  
7. The product should be connected to a power supply only of the type described in the operating instructions or  
as marked on the product. Replace the fuse only with one of the specified type, size, and correct rating.  
8. The power supply cord should: (1) be undamaged, (2) never share an outlet or extension cord with other  
devices so that the outlet’s or extension cord’s power rating is exceeded, and (3) never be left plugged into  
the outlet when not being used for a long period of time.  
9. Care should be taken so that objects do not fall into, and liquids are not spilled through, the enclosure’s  
openings.  
10. The product should be serviced by qualified service personnel if:  
A.  
B.  
The power supply cord or the plug has been damaged.  
Objects have fallen into, or liquid has been spilled onto the product.  
C. The product has been exposed to rain.  
D. The product does not appear to operate normally or exhibits a marked change in performance.  
E.  
The product has been dropped, or the enclosure damaged.  
11. Do not attempt to service the product beyond what is described in the user-maintenance instructions. All  
other servicing should be referred to qualified service personnel.  
3
 
FEATURES  
PEQ-5B Parametric Equalizer  
With its advanced state-of-the-art features and versatile utility, the PEQ-5B five-band parametric equalizer is a rugged work-  
horse, designed for long-haul reliability in the studio and live sound reinforcement applications.  
•15dB boost/cut per band  
• Constant-Q, state-variable filter circuitry for precision control of tone coloration  
• Parallel phase filters for minimal phase shifting  
Tunable high and low-cut filters for removing floor rumble, tape hiss, etc..  
• Each band independently switchable and adjustable in bandwidth (.03 to 2 octaves wide), allowing a range of adjustment  
from tight notching to extreme boost/attenuation by band overlapping  
• Constant-Q state variable filters for maximum filter stability  
• Servo-balanced XLR and 1/4" TRS inputs and outputs  
• Bypass switches on each channel with LED status indicators  
• Highly accurate 12-segment LED switchable Input/Output meter  
• Failsafe relay with auto-bypass during power failure  
• Single rack space (1U) rugged metal housing for reliability  
• IEC power cord socket for AC operation with internal shielded power supply, external fuse, and ~115V (60Hz) / ~230V  
(50Hz) AC select switch  
4
 
INSTALLATION  
To ensure years of enjoyment from your NADY AUDIO PEQ-5B  
Parametric Equalizer, please read and understand this manual  
thoroughly before using the unit.  
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.  
1. Inspection  
Your NADY AUDIO PEQ-5B was carefully packed at the fac-  
tory in packaging designed to protect the units in shipment.  
Before installing and using your unit, carefully examine the  
packaging and all contents for any signs of physical damage  
which may have occurred in transit.  
4. Power Connection  
The PEQ-5B 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.  
(Note: Nady Systems is not responsible for shipping damage.  
If the unit is damaged, do not return to us, but notify your  
dealer and the shipping company immediately to make a  
claim. Such claims must be made by the consignee in a timely  
manner.)  
Check to see that the unit is set to the voltage for your area by  
referring to the table below:  
2. Rack Mounting  
Europe (except UK): 230V, 50Hz  
This model is designed for mounting in a standard 19" equip-  
ment rack or one of the many rack type portable cases avail-  
able on the market. The unit fits in a standard 19" single  
rack (1.75"). Install the equalizer in a rack with the rack  
screws provided. Please allow at least an additional 4" depth  
for the connectors on the back panel. 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. The PEQ-5B does not generate  
an unduly large amount of heat and does not need to be spe-  
cially ventilated or cooled. The unit should not be subjected,  
however, to high heat environments. Although the unit's chas-  
sis is shielded against radio frequency (RF) and electromag-  
netic interference (EMI), extremely high fields of RF and EMI  
should be avoided.  
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.  
5. Signal Levels  
Signal levels from -21dBu to +21dBu are considered normal.  
Do not directly connect microphones into the equalizers  
inputs. Microphones require a pre-amp.  
6. Chassis Grounding  
The PEQ-5B is equipped with a rear panel Ground Screw.  
This is generally connected with a short piece of wire to the  
chassis ground shared by the other connected equipment in  
the rack. 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 combina-  
tions that can be attempted.  
3. Input/Output Connections  
The 1/4" TRS phone jack and XLR connector inputs and out-  
puts can be used for balanced and unbalanced connections.  
For balanced connection,  
For unbalanced operation,  
wire the connectors as follows: wire the connectors as follows:  
XLR JACK  
PIN 1  
CONNECTION  
GROUND  
CONNECTION  
XLR JACK  
PIN 1  
Note: ALWAYS TURN YOUR AMPLIFIERS DOWN BEFORE  
CHANGING YOUR GROUNDS AROUND.  
GROUND  
HIGH (+)  
(optional, use as shielding to prevent hum)  
HIGH (+)  
LOW (-)  
PIN 2  
PIN 2  
PIN 3  
Try different combinations of lifting ground wires 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.  
1/4” TRS JACK CONNECTION  
TIP  
CONNECTION  
1/4” TRS JACK  
HIGH (+)  
LOW (-)  
HIGH (+)  
GROUND  
TIP  
RING  
GROUND  
SLEEVE  
SLEEVE  
(optional, use as shielding to prevent hum)  
5
 
CONTROLS AND CONNECTIONS  
2
INPUT/OUTPUT LEVEL(dB)  
-30  
0
-24  
-18  
-12  
-6  
-3  
0
+3  
+6  
10  
+9  
+12  
-5  
+18  
20kHZ-400kHz  
60HZ-1kHz  
150HZ-2.5kHz  
500HZ-8kHz  
1kHZ-20kHz  
BAND  
BAND  
BAND  
BAND  
BAND  
1
2
3
4
5
0
0.8  
0
0.8  
1.8  
0
0.8  
4
0.8  
110  
0
0.8  
250  
0
600  
75  
POWER  
-5 -5  
-5  
7
+5  
0.4  
0.1  
1.2  
80  
150 -5 -5  
250  
+5  
0.4  
0.1  
1.2  
160  
350  
-5  
-5  
+5  
0.4  
0.1  
OUT 22  
1.2  
400  
900 -5 -5  
+5  
0.4  
0.1  
OUT 22  
1101.5  
2.7  
+5  
0.4  
0.1  
22  
1.2  
7
6.5  
+5  
50  
25  
OUT 22  
110  
15  
1.4k  
22  
PEQ-5B  
4.6  
-10  
10  
550  
-10  
200  
1.6  
0.7  
1.6  
22  
40  
1.6  
80  
1.6  
1.5  
1.6  
200  
3.5  
5
Band  
Parametric  
Equalizer  
-10  
-10  
+10  
+10  
+10  
+10  
+10  
+10  
-10  
-10  
OUT 22  
OUT  
IN  
OUT  
-15  
-15  
-15  
2.5k  
-15  
-15  
-15  
+15  
0.03  
OCTAVE  
2
20  
400  
+15  
0.03  
OCTAVE  
2
60  
1k  
+15  
0.03  
OCTAVE  
2
150  
+15  
0.03  
OCTAVE  
2
2.5  
30  
+15  
0.03  
OCTAVE  
2
2.5  
20  
+15  
10  
400  
2.5  
30  
IN  
IN  
Hz  
IN  
kHz  
KHz  
IN  
Hz  
Hz  
dB  
dB  
dB  
IN  
KHz  
dB  
dB  
dB  
Hz  
LEVEL  
FREQUENCY  
LEVEL  
FREQUENCY  
LEVEL  
FREQUENCY  
LEVEL  
AUDIO  
BANDWIDTH FREQUENCY  
LEVEL  
AUDIO  
BANDWIDTH  
INPUT  
AUDIO  
LOW CUT  
HIGH CUT  
AUDIO  
BANDWIDTH  
AUDIO  
BANDWIDTH  
AUDIO  
BANDWIDTH  
FREQUENCY  
1
8
9
10  
3
5
6
7
4
FRONT PANEL  
4. MASTER INPUT CONTROL  
Use this CONTROL TO DETERMINE THE INPUT LEVEL TO THE  
UNIT. It can be set from -15 to + 15dB.  
The Nady PEQ-5B has five parametric filters organized in five  
different frequency bands. A 12-segment LED display shows  
the input or output level, and there is both a master low-cut  
and high-cut filter.  
5. MASTER LOW CUT CONTROL  
Use this control to adjust the lower cutoff frequency of the  
PEQ-5B. The high pass filter can be tuned from 10 to 400 Hz.  
In the 10 Hz position the signal passes unchanged.  
1. POWER SWITCH  
To turn the unit ON or OFF, press the upper or lower portion  
of this button.  
6. MASTER HIGH CUT CONTROL  
2. MASTER INPUT/OUTPUT LEVEL METER DISPLAY  
This 12-segment LED meter is used to monitor the signal lev-  
els, so as to avoid overload distortion. The display shows the  
input or output level as selected by the AUDIO IN/OUT switch  
(INPUT is selected with the switch pressed in). The top red LED  
lights at a level of about +18 dB, which is about 3 dB below  
clipping.  
Use this control to adjust the upper cutoff frequency of the  
unit. The low-pass filter can be tuned from 2.5 to 30 KHz. In  
the 30 KHz position the signal passes unchanged.  
7. BAND LEVEL CONTROLS  
Use this control to determine the amount of level boost/cut for  
each band. The setting ranges from -15 to + 15 dB.  
(Note: Extreme boost settings in combination with a high input  
level can cause overload clipping. If this happens, reduce the  
input level as necessary with the INPUT control.)  
8. BAND IN/OUT SWITCHES WITH LED INDICATORS  
Use these switches to enable/disable specific bands in the  
audio path. The LED lights when the switch is IN.  
3. MASTER AUDIO IN/OUT SWITCH WITH LED INDICATOR  
This is used to enable/disable the entire equalizer section in  
the audio path, allowing A/B comparisons between the  
processed and unprocessed signals. The switch uses a relay-  
controlled hard-bypass function, so that if it is not pressed in  
or if the unit is switched off, the inputs are directly connected  
to the outputs. The switch also selects the input or output sig-  
nal for display on the INPUT/OUTPUT LEVEL meter. The LED  
lights when the switch is IN.  
9. BANDWIDTH CONTROLS  
Use these controls to determine the "Q" or slope of the filter in  
each band. Settings range from 0.03 (Q=43) to 2 octaves  
(Q=0.67).  
10. BAND FREQUENCY CONTROLS  
Use these controls to select the filter's center frequency in each  
band. This can be any frequency within that band's frequency  
range.  
6
 
15  
14  
12  
11  
115~230V  
INPUTS  
OUTPUTS  
FUSE  
T250mAL 250V  
TIP/PIN  
RING/PIN  
SLEEVE/PIN  
2
TIP/PIN  
RING/PIN  
SLEEVE/PIN  
2
3
CAUTION:  
TO REDUCE THE RISK OF FIRE,  
REPLACE ONLY WITH THE SAME  
TYPE AND RATING OF FUSE  
3
1
1
ATTENTION: UTILISER UN FUSIVLE DE  
RECHANGE DE NENE TYPE  
NADY SYSTEMS, INC.  
Emeryville, CA USA  
AC INPUT  
MADE IN TAIWAN  
13  
16  
REAR PANEL  
11. BALANCED SIGNAL INPUT JACKS (1/4" TRS & XLR)  
These 1/4" TRS (Tip/Ring/Sleeve) and XLR jacks are wired  
for balanced input signals (0.775V=0dBm, 15K Ohms)  
and signal polarity is Tip/Pin 2 = Cold (+), Ring/Pin 3 =  
Hot (-), and Sleeve/Pin 1 = Ground.  
14. AC FUSE HOLDERS  
This fuse holder contains an AC primary fuse. When this fuse  
blows, replace it with the same type fuse, size and power rat-  
ing (120 VAC: 250mA/250V; 230 VAC: 125mA/250V). If it  
continuously blows, stop replacing the fuse and refer servicing  
to qualified personnel.  
12. BALANCED SIGNAL OUTPUT JACK (1/4" TRS & XLR)  
These 1/4" TRS and XLR jacks provide a balanced signal out-  
put (600 Ohms) and are wired with the same signal polarity  
as the Input Jacks above.  
CAUTION: After checking the AC supply voltage, be sure that  
the correct fuse is in the fuse holder.  
15. AC VOLTAGE SELECTOR SWITCH  
13. POWER CONNECTOR  
The IEC cord connector is used to connect the AC power  
source to your power amplifier.  
Before plugging in the power cord, check to see that the unit  
is set for the proper voltage for your area: ~115V (60Hz) or  
~230V (50Hz).  
CAUTION: DO NOT REMOVE THE CENTER GROUNDING PIN.  
16. GROUND WIRE SCREW  
Connect a short ground wire from this screw to the grounding  
point for all connecting equipment in your rack (see also sec-  
tion A 6 above: Chassis Grounding).  
7
 
OPERATION  
1. Parametric and Graphic Equalizers  
Conventional parametric equalizers typically employ series  
filters, which can introduce noticeable phase shifts and  
delays. The advanced-design PEQ-5B features parallel filters,  
which are a marked improvement and provide optimized  
audio free of such undesirable artifacts. Parallel filter design  
thus allows for more "musicality" in the audio processing.  
It should be noted, however, that while extreme boost/cut of  
frequencies can be realized by overlapping the frequencies  
of individual bands, this technique must be exercised with  
care when using the PEQ-5B so that the "musicality" of the  
final sound image is retained.  
Parametric equalizers are extremely useful, versatile tools in  
both live sound and recording applications. They can enable  
a wide variety of tasks, from gentle contouring and audio  
sweetening in the studio, to room equalization and feedback  
notching in sound reinforcement. The most advanced form of  
equalization system available, the parametric equalizer allows  
adjustment of all three parameters required for complete con-  
trol of equalization: bandwidth, frequency and amplitude  
boost/cut. While graphic equalizers only provide a series of  
adjacent bands for control of a specific frequency, parametric  
equalizers allow for selecting a specific frequency directly.  
Thus, they can be used to realize complex frequency curves  
with highest precision. Since the acoustic results obtained with  
parametric equalizers are not as predictable as those of  
graphic equalizers, it is necessary to work with parametric  
equalizers for a while to get a feeling for the functions and  
the results they can achieve.  
The PEQ-5B enables both notching/peaking and rolling-off  
frequency bands. Notching and peaking refer to specific  
attenuation or boosting respectively of single frequencies or  
bands. Peaking is achieved by band-pass filters and notching  
by notch filters. Although similar in concept, these two filter  
types achieve the exact opposite effect. Rolling off is done by  
either high or low pass filters. In the PEQ-5B, these filters  
have a slope of 6 dB/octave and can be varied within a  
wide frequency range.  
2. Basic Operation of the PEQ-5B Parametric EQ  
The Nady PEQ-5B provides all the advantages of both para-  
metric equalizers and narrow-band notch filters. Its advanced  
design and high performance enable equalization flexibility  
limited only by the imagination. With a variable bandwidth  
ranging from 0.03 to 2 octaves, the PEQ-5B is the most flexi-  
ble equalizer available. It is totally superior to graphic equal-  
izers in all ways, and for almost all applications, from post-  
production in audio, video and broadcast studios to on stage use.  
amplitude  
BW=.03  
BW=2  
+15 dBu  
0
Each of the PEQ-5B's 5 bands can be adjusted from extreme-  
ly narrow to broadband. Its additional low and high-cut filters  
have a slope of 6 dB/octave and can be varied over a wide  
frequency range and enable control of the entire frequency  
response for your specific application. With all this equaliza-  
tion available, it is easy to modify the entire spectrum of the  
signal being processed at once. The added filters allow both  
high and low broadband corrections, while the parametric fil-  
ters process hum, feedback, and other narrow frequency  
band problems.  
-15 dBu  
BW=.03  
BW=2  
f2  
f3  
f4  
frequency  
f1  
Fig. 1: Narrow (BW=.03) and Wide (BW=2)  
notch (f1, f2) and peak (f3, f4) filters  
amplitude  
0 dBu  
The PEQ-5B utilizes Constant -Q filters which prevent the  
parameters frequency, bandwidth and amplitude from affect-  
ing each other. Such independence allows more clearly  
defined and repeatable filter settings. When several filters are  
used simultaneously, the resulting overall filter curve can be  
calculated by adding/subtracting the single band-specific fil-  
ter curves.  
-15 dBu  
f l  
f
frequency  
o
w
h
i
g
h
Fig. 2: Roll-off function  
8
 
APPLICATION  
(Note: If feedback notching is the only task you have planned  
for the PEQ-5B, you should consider also the Nady FS-4N  
Feedback Suppressor, which features 4 notching bands and a  
built-in audio spectrum analyzer for the quickest, most effec-  
tive feedback suppression possible.)  
1. Typical Uses  
The PEQ-5B allows creative audio processing previously not  
possible with graphic or less advanced parametric equalizers  
by enabling the user to set all filter parameters center frequen-  
cy, bandwidth and amplitude) in five separate bands. These  
bands cover the entire 20 Hz to 20 KHz audio range and the  
frequency ranges of the individual bands overlap, allowing  
two bands to be set to one center frequency for added  
boost/cut capability. The PEQ-5B can be used both by itself  
or in conjunction with conventional graphic 31 or 15 band  
equalizers. In live sound situations, for example, the graphic  
EQ can be used for the rough mix and the PEQ-5B can be  
used to help fine tune the overall sound.  
If a spectrum analyzer is not available to help identify trouble-  
some frequencies, it is most effective to do so by actually rais-  
ing the gain in the narrow-band filter at first to make them  
heard, and then simply eliminating the undesirable frequen-  
cies by subsequently lowering the level.  
The PEQ-5B can also be used for a wide variety of other  
applications other than narrow-band notching. For example:  
to simulate speaker crossover networks, or simple tone cir-  
cuits, or even for drastic modifications such as "telephone  
voice". Since broad band frequency corrections are the most  
common type of equalization in live sound applications, the  
PEQ-5B can be easily utilized for this purpose by 2 or 3  
broad-band parametric filters in combination with the low  
and high-cut filters to achieve the required overall frequency  
equalization. Then the remaining 2 or 3 bands can be used to  
eliminate feedback and correct room resonances. The PEQ-5B  
can also be useful to help compensate for problems of poor  
microphone positioning and/or increased intelligibility.  
Room acoustics can also be corrected for poor speaker place-  
ment dictated by other than pure acoustic considerations.  
One of the PEQ-5B's most useful capabilities is notching out  
troublesome frequencies caused by feedback in live mixing,  
for example, or hum or appliance noises in recording appli-  
cations. When such problems require extra cut than can be  
achieved by a single filter, simply adjust two filters to the same  
center frequency and bandwidth. Setting both LEVEL controls  
then to the left stop position doubles the amount of notching.  
Similarly you can also achieve doubled boosting (peaking)  
when needed, by adjusting both LEVEL controls to the right  
stop position.  
(Notes:  
a. Since all narrow-band filters produce a slight phase shift  
and thus time delay of the signal, care must be taken with  
extremely narrow and high gain settings to avoid annoying  
"ringing" sounds. Always set all filters not in use to mid-travel  
position or switch them off to minimize such effects.  
b. To avoid damaging connected equipment and cause unde-  
sirable effects such as distortion or feedback, always start  
with all controls set to mid-travel position and all IN/OUT  
switches OUT.)  
Once all the equalization has been adjusted as required by  
the application, the INPUT control is used to set the overall  
level of the PEQ-5B's processed signal. The signal can be  
raised or lowered as desired. Use the IN/OUT switch for a  
direct A/B  
comparison as a guide for proper level adjustment.  
Troublesome frequencies that are to be notched out can be  
identified by ear (although that requires some trial and error  
and a bit of patience, or more effectively by the use of an  
audio spectrum analyzer. Resonance frequencies can then be  
quickly identified, enabling quick tuning of the required filters  
on the PEQ-5B.  
9
 
3. Inserting the PEQ-5B in the Signal Path  
2. Use in Sound Reinforcement  
The PEQ-5B can be inserted in the signal path at different  
points, depending on the setup and application of your sys-  
tem. For example, it can be inserted in the line inserts of your  
mixer, sub-group inserts, effects paths, or between signal  
processors and mixer or power amps, and so on.  
In typical live sound applications, EQ's are used to increase  
the overall volume or "punch" of the sound (while eliminating  
feedback), enhance the natural "musicality" of the mix, and  
improve the intelligibility of speech. Understanding that there  
are always compromises that must be made, care must be  
taken so that the overall effect of the equalization is an  
improvement, not deterioration, of the overall sound.  
Sometimes, hard decisions must be made between priorities  
for achieving the desired result. For example, it may not be  
possible to have a natural sound and acoustic power or  
speech intelligibility at the same time.  
(Note: In the event of a power supply disconnection or failure,  
a relay built into the PEQ-5B automatically silently bypasses  
the unit. This relay also prevents bothersome "thumps" when  
first turning on the unit.)  
For use with more complex systems, such as complex sound  
reinforcement applications with speakers located in varying  
acoustic environments and utilizing delay line units for run-  
time difference compensation, it is recommended that you  
consult with experienced audio sound technicians or read  
more extensive written material on this subject, as it is beyond  
the scope of this manual to provide more than introductory  
information on the use of the PEQ-5B.  
Although pink noise or swept sine waves are often the best  
way to identify problems of room acoustics and system defi-  
ciencies (especially in the critical range of 2 to 4 KHz), the  
ear can also be used with great effect, especially if care is  
taken to train it to serve as a sound evaluation diagnostic  
tool. Start by playing music or speech program material with-  
out equalization, and add it slowly so you can gauge the  
effects on the sound you can hear from the different settings.  
Ultimately, there is no substitute for experience in utilizing the  
PEQ-5B to its fullest potential.  
Often, you will find that room acoustics problems must be  
dealt with at the source, as they cannot be fixed as effectively  
by using an equalizer. To check out room acoustics most accu-  
rately, use either a pink noise or swept sine wave generator  
and a real-time analyzer (RTAS) with a calibrated microphone  
and verify that the measured frequency response, at various  
points in the room, are all about the same. If they are not,  
then you may need to make corrections to your setup, check  
system and speaker phasing, etc., to minimize the variations  
you are measuring. This can also be done with a trained ear  
but requires very careful concentration and considerable ear  
training for most effectiveness. Once you have made all the  
improvements you can to your basic setup, you can fine tune  
the system with the PEQ-5B.  
(Note: Although equalizers are the most important acces-  
sories in your audio system, and can often deliver amazing  
results in improving the overall punch and sound quality of  
your system, they cannot work miracles. Ultimately the rest of  
your system and setup must also operate at top efficiency for  
the PEQ-5B to be most effective.)  
10  
 
SPECIFICATIONS  
AUDIO INPUT  
POWER CONSUMPTION: 7 Watts  
CONNECTORS:  
Servo-balanced input 1/4" TRS  
and XLR jacks  
POWER SOURCE:  
AC: 120V/230V, 50/60 Hz  
(voltage selectable)  
120 VAC: 250 mA / 250V  
(slow-blow);  
NOMINAL SENSITIVITY: 0.775 (0dBm)  
IMPEDANCE:  
FUSE REQUIREMENTS:  
50 K balanced  
MAX. INPUT LEVEL:  
+21 dBU balanced  
230 VAC: 125 mA / 250V  
(slow-blow)  
AUDIO OUTPUT  
CONNECTORS:  
POWER CONNECTOR:  
Servo-balanced output 1/4" TRS DIMENSIONS:  
and XLR jacks  
standard IEC receptacle  
19" X 1.75" X 7.25"  
(483 X 44 X 184 mm), 1U rack  
height  
NOMINAL LEVEL:  
MAX. OUTPUT LEVEL:  
IMPEDANCE:  
0.775 (0 dBm)  
+21 dBu balanced  
60 Balanced  
WEIGHT:  
6.6 lbs (3.0 Kg)  
FREQUENCY RESPONSE:  
16Hz~30KHz, < 3.0 dB  
SIGNAL-TO-NOISE RATIO: > 96 dB w/ABP filter  
Note: For improvement purposes, specifications, design and  
appearance are subject to change without prior notice.  
T.H.D.:  
< 0.004%, @ +4 dBU, 1 KHz,  
Gain 1  
LOW-CUT FILTER:  
HIGH-CUT FILTER:  
10 Hz to 400 Hz, variable, 6  
dB/octave  
2.5 KHz to 30 KHz, variable, 6  
dB/octave  
PARAMETRIC FILTERS  
TYPE:  
LEVEL:  
State-variable parametric filter  
-15 dB to +15 dB, variable  
FREQUENCY RANGE:  
Band 1:  
20-400 Hz  
Band 2:  
60 Hz-1 Khz  
Band 3:  
Band 4:  
150 Hz to 2.5 KHz  
500 Hz to 8 KHz  
Band 5:  
1 KHz to 20 KHz  
FUNCTION SWITCHES:  
Master Audio In/Out, Band  
In/Out (for each band),  
115/230 VAC power select  
INDICATORS:  
INPUT/OUTPUT LEVEL:  
12-segment LED display: -30/-24/-18/-12/-6/3/0/  
+3/+6/+9/+12/+18 dB  
FUNCTION SWITCH:  
LED Indicator for every switch,  
IN=LED on  
11  
 
SERVICE FOR YOUR NADY AUDIO PRODUCT  
(U.S.) Should your NADY AUDIO product require service, please contact  
the Nady Service Department via telephone at (510) 652-2411 or E-mail  
(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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