Nady Systems Musical Instrument FS4N User Manual

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CONTENTS  
FEATURES ........................................................................................................................................... 2  
WARNING .......................................................................................................................................... 4  
CONTROLS AND CONNECTIONS ...................................................................................................... 5  
TYPICAL SETUP ................................................................................................................................... 7  
SPECIFICATIONS ................................................................................................................................. 8  
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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.  
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  
WARNING When using electric products, basic precautions should always be followed, including the following:  
1.  
2.  
Read all the instructions before using the product.  
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.  
4.  
This product should be used only with a cart or stand that will keep it level and stable and prevent  
wobbling.  
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 aaudiologist.  
5.  
6.  
The product should be located so that its location or position does not interfere with its proper ventilation.  
The product should be located away from heat sources such as radiators, heat vents, or other devices  
( including amplifiers) that produce heat.  
7.  
8.  
9.  
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 and size  
and with the correct rating.  
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) be left plugged into the  
outlet when left unused for a long period of time.  
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 when:  
A. The power supply cord or the plug has been damaged; or  
B. Objects have fallen into, or liquid has been spilled onto the product; or  
C. The product has been exposed to rain; or  
D. The product does not appear to operate normally or exhibits a marked change in performance; or  
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.  
4
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CONTROLS AND CONNECTIONS  
FRO N T PAN EL  
4
3
2
1
5
1. POWER SWITCH  
To turn the unit ON or OFF, press the upper or lower portion of this button.  
2. POWER LED INDICATOR  
This LED illuminates when the power is turned "ON".  
3. AUDIO SPECTRUM ANALYZER DISPLAY  
This in-line 8-band audio spectrum analyzer enables quick identification of the frequency range of any  
problem frequency and allows monitoring of the amount of reduction selected in any of the notches.  
The display monitors both the input and output levels as selected by the Bypass switch (5). It monitors the output  
when the switch is IN (down), and the input when the switch is OUT (up) for bypass mode. The audio spectrum  
display has a range of 25Hz to 16 KHz in 8 frequency bands, with 6 LEDs in each tree indicating levels  
from +3 to –20dB.  
4. NOTCH FILTERS  
Use these notch filters to control up to four different feedback (howling or screeching resonances) frequencies  
independently.  
a. FREQUENCY SELECT CONTROL  
Adjust the desired suppression frequency for each notch independently with this control. The filters are  
extremely narrow (1/ 60 octave) so take care in properly tuning out the desired feedback.  
b. SCALE FREQUENCY MULTIPLIER SWITCH  
Use this switch to select either X1 (up) or X10 (down) multiplier of the frequency scale on the Frequency  
Select Control as needed to "tune in" on the desired suppression frequency.  
c. NOTCH DEPTH CONTROL  
Use this control for precise adjustment of the amount of attenuation (up to -20dB) necessary to suppress the  
selected feedback frequency. For the least effect on your overall sound, adjust the attenuation to just below  
the amount needed to suppress feedback.  
5. BYPASS IN/ OUT SWITCH  
Use this switch to select all 4 notches simultaneously either IN (down) or bypassed OUT (up) for fast monitoring  
of results during use.  
5
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REAR PAN EL  
10  
11  
9
7
6
8
6. BALANCED SIGNAL INPUT JACK (1/ 4" TRS)  
This 1/ 4" TRS (Tip/ Ring/ Sleeve) phone jack is wired for balanced input signals (0.775V=0dBm, 15K Ohms)  
and signal polarity is Tip = Cold (+), Ring = Hot (-), and Sleeve = Ground.  
7. BALANCED SIGNAL OUTPUT JACK (1/ 4" TRS)  
This 1/ 4" TRS jack provides a balanced signal output (600 Ohms) and is wired with the same signal polarity  
as the Input Jack above.  
8. 24 VDC TERMINAL  
Use this screw terminal to operate the unit with external 24 VDC powering, either from a power supply or a  
battery. Observe the correct polarity (+ and -) when making connections as marked on the terminal. The power  
requirement is 250 mA.  
9. 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 rating (120 VAC: 0.315A/ 250V; 230 VAC: 0.2A/ 250V). If it continuously blows, 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.  
10. POWER CONNECTOR  
The IEC cord connector is used to connect the AC power source to your power amplifier.  
CAUTION: DO NOT REMOVE THE CENTER GROUNDING PIN.  
11. AC VOLTAGE SELECTOR SWITCH  
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).  
6
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TYPICAL SETUP  
The FS-4N Feedback Suppressor is typically connected between the mixer and other effects or processors and/ or the  
power amplifier in live sound applications. The entire audio in a given setup should feed through the FS-4N so that  
you may control all hum, noises and feedback appearing anywhere in the signal you are amplifying. Since both  
monitor (if used) and FOH (Front-of-House) amplification may cause feedback, it may be necessary to suppress  
frequencies in each loop. Furthermore, you may also be using a stereo FOH mix. Since the FS-4N is a mono unit,  
up to three units may be needed in stereo live sound setups for total control of the monitor and each side of the  
stereo FOH amplification.  
MONITOR MIX  
F.O.H. MIX  
MO N O AMP  
STEREO AMP  
MONITOR  
MONO AMP  
FRONT-OF-HOUSE  
STEREO AMP  
VOL  
VOL  
VOL  
F.O.H. SPEAKERS  
STAGE MONITOR  
SPEAKERS  
NOTE: Insert any processors, EQs, etc. between the mixer and the FS-4N. The Feedback Suppressor should be the  
last processor in line before connecting the audio to the amplifier.  
7
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SPECIFICATIONS  
INPUT CONNECTOR:  
INPUT SENSITIVITY:  
INPUT IMPEDANCE:  
OUTPUT CONNECTOR:  
OUTPUT LEVEL:  
One 1/ 4" TRS phone jack  
0.775 (0dBm)  
15 K ohm balanced  
One 1/ 4" TRS phone jack  
0.775 (0 dBm)  
OUTPUT IMPEDANCE:  
FREQUENCY RESPONSE:  
SIGNAL-TO-NOISE RATIO:  
T.H.D.:  
600 OHM BALANCED  
20Hz~20KHz, < ±1.0 dB  
> 68 dB  
< 0.4%  
NOTCH FILTER FREQUENCY RANGE:  
NOTCH DEPTH:  
60 HZ ~ 6 KHz, continuously variable  
0 ~ -20 dB  
POWER CONSUMPTION:  
POWER SOURCE:  
FUSE REQUIREMENTS:  
5.5 Watts  
AC: 120V/ 230V, 50/ 60 Hz; DC: 24V  
120 VAC: 0.315 A / 250V;  
230 VAC: 0.2A / 250V  
19" X 1.75" X 8.3"  
(483 X 44 X 210mm), 1U rack height  
6.6 lbs (3.0 Kg)  
DIMENSIONS:  
WEIGHT:  
Note: For improvement purposes, specifications, design and appearance are subject to change without  
prior notice.  
8
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