Nady Systems Stereo Amplifier 3WA 1700 User Manual

O W N E R ’ S M A N U A L  
3WA-1700  
3-CHANNEL PROFESSIONAL P O W E R A M P L I F I E R  
 
WA R N I N G  
IMPORTANT SAFETY INSTRUCTIONS  
When using this 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.  
E.  
The product does not appear to operate normally or exhibits a marked change in performance.  
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
 
C O N T R OLS AND CONNECTIONS  
FRONT PANEL  
(4)  
(2)  
(3)  
(7) (6)  
(7)  
(5)  
(6)  
(1)  
(5)  
1. POWER SWITCH  
6. CLIP (PEAK) LED INDICATORS  
To turn the unit ON or OFF, press the upper or lower portion of  
this button. Before turning on the amplifier, check all connections  
and turn down the level controls. A momentary muting is normal  
when turning the amplifier on or off.  
These LEDs illuminate if the corresponding channel’s output is  
within 3dB of clipping. Occasional blinking of the LEDs is  
acceptable, but if they remain on more than intermittently you  
should turn down either the power amplifier’s level controls or  
reduce the output level of the preceding component to avoid  
audible distortion.  
(Caution: Always turn on your power amplifier last, after all your  
other connected equipment, and always turn off your power  
amplifier before your other connected equipment.)  
[Caution: Prolonged use at levels in excess of clipping can  
cause damage to your speakers and even the internal amplifier.  
Carefully monitor the clipping LEDs to avoid prolonged clipping.]  
2. POWER LED INDICATOR  
This LED illuminates when the power is turned “ON”.  
7. PROTECT LED INDICATORS  
These LEDs illuminate if the power amplifier’s safety circuit has  
been triggered to shut off the outputs. This can occur if the  
output connection has been shorted, the load impedance is too  
low, there is DC voltage at the outputs, or if the power amp  
overheats due to excessive clipping. When either of these LEDs  
is lit up, turn OFF the power and check the output connections  
to verify that they are correct. If the output connections are  
shorted, or a speaker is blown, correct the problem (or unplug  
the speaker) and try turning the amp back on. It’s also prudent  
to carefully feel if the amplifier is very hot due to excessive  
clipping. If so, allow the amp to cool down before turning the  
power back on.  
3. SUBWOOFER LEVEL CONTROL  
This controls the level of the signal for the Subwoofer channel.  
The actual voltage gain is shown in dB. Turn the level down  
(counterclockwise) if the Clipping LEDs (6) illuminate steadily  
(indicating too strong an output signal).  
4. CHANNEL 1 & 2 LEVEL CONTROLS  
These control the level of channel 1 & 2.  
5. SIGNAL LED INDICATORS  
These LEDs illuminate to confirm the presence of an input  
signal greater than 110mV on that channel of the amplifier.  
4
 
C O N T R OLS AND CONNECTIONS  
BACK PANEL  
(8)  
(8)  
(9)  
(12)  
(13)  
(15)  
(10)  
(11)  
(14)  
8. BALANCED INPUT CONNECTORS (1/4" TRS & XLR)  
These balanced 1/4” (6.3mm) TRS (Tip/Ring/Sleeve) phone  
12. OUTPUT CONNECTORS  
These binding post (banana) connectors can accommodate  
banana plugs, MDP modular dual plugs, or they can be  
unscrewed and used for simple binding post connections.  
Make sure all connections are tidy and there are no loose wires  
sticking out that could short the outputs. Connections are as  
depicted on the rear panel and in the following SPEAKER  
CONNECTIONS section on page 7 of this manual.  
jacks and balanced XLR jacks are designed to accept line level  
balanced or unbalanced signals for each channel. They are  
wired Tip/Pin 2 = (+), Ring/Pin 3 = (-), and Sleeve/Pin 1 =  
Ground. Balanced input signals are recommended, as they are  
less prone to AC hum. For long cable runs, a source of less  
than 600output impedance is needed to avoid signal loss. For  
short cable runs an unbalanced signal input should be suitable.  
[Caution: Make sure that the speaker, speaker connectors, and  
wiring can handle the rated output power to avoid damage.  
Speaker power ratings (in RMS) should always exceed  
amplifier power ratings. Note that prolonged use at levels in  
excess of clipping can possibly drive the amplifier into thermal  
runaway and damage the internal amplifier and speaker, so  
care must be taken not to overload the amplifier. Never use  
less than 4total impedance for any channel, as this also can  
cause the amplifier to overheat and create thermal runaway.]  
Since the TRS phone jacks and XLR jacks are wired together  
internally for each channel, you can parallel these jacks with  
another amplifier by connecting either the 1/4" jack or the XLR  
jack to the input jack of another amplifier. You can also parallel  
the inputs of two channels together using this same technique.  
9. LOW PASS FREQUENCY CONTROL  
This control adjusts the roll-off frequency point of the internal  
low pass filter from 50Hz to 250Hz. Adjust this control, with  
music playing, to find the frequency setting that delivers the  
best punch from your subwoofers. The Filter/Source Switch  
(10) must set to ON to use this function.  
13. FANS  
The four variable-speed fans adjust speed automatically to  
maintain the proper internal operating temperature. Never  
block the air vents on the front, back, and side panels of the  
amplifier to allow proper ventilation.  
10. FILTER / SOURCE SWITCH  
This switch enables or disables the internal low pass filter.  
When the switch is set to ON, the internal low pass filter is  
enabled, the Subwoofer inputs should remain unused, and the  
input signals of channel 1 and 2 are used as the source for the  
subwoofer. The Ch 1 and 2 signals are combined and sent  
through the crossover and on to the Subwoofer output.  
14. POWER CONNECTOR  
The cord connector is used to connect the 115VAC power  
source to your power amplifier.  
[Caution: Never remove the center grounding pin as this can  
cause a serious safety hazard and will immediately void your  
warranty.]  
When the switch is set to OFF, the internal crossover is  
disabled and the Subwoofer input is used as the source. This  
allows the use of an external active crossover or using the Sub  
channel to pass full-range signals for monitor feeds or sound  
reinforcement.  
15. FUSE  
The fuse holder contains a 3AG fast blow fuse. If this fuse  
continuously blows, shut off the unit and have it serviced by the  
Nady Service Department.  
11. LOW CUT FILTER SWITCH  
This switch enables/disables the low cut filter for the Subwoofer  
output. The filter has a fixed roll-off frequency at 30Hz with  
12dB/octave of cut. This can tighten up the sound while  
reducing muddy bass and stage rumble. This filter is only  
active when the Filter/Source Switch (10) enabled.  
5
 
I N S TA L L AT I O N  
To ensure years of enjoyment from your NADY AUDIO 3WA-1700 amplifier, please read and understand this manual thoroughly  
before using the unit.  
INSPECTION  
Your 3WA-1700 amplifier was carefully packed at the factory 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 that may have occurred in  
transit.  
(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.)  
CONTENTS  
• Instruction manual  
• 3WA-1700 (verify that the unit’s serial number is same as shown on shipping carton)  
• AC Power cord  
• Warranty Card  
RACK MOUNTING  
The 3WA-1700 amplifier Is designed for standard 19" rack mounting as well as “stack” mounting without a cabinet. Use 4 screws and  
washers for mounting to the front rack rails. It is also a good idea to support the amps also in the rear, especially for mobile use  
where the amps will be subjected to shocks.  
AMPLIFIER COOLING  
Also pay close attention to the cooling requirements. Never block the front, rear or side air vents. For best results, in high output  
power applications, you should augment the amplifier’s air flow with a rack cooling system.  
INPUT CONNECTIONS  
The following instructions describe the most common ways to install your amplifier into a sound system.  
6
 
SPEAKER CONNECTIONS  
The following instructions describe the most common ways to install your amplifier into a sound system. Turn off the amplifier power  
switch before making any connections.  
(Note: Nady Systems assumes no liability for damaged speakers resulting from improper wiring, careless amplifier use, or over  
powering.)  
• Mains & Subwoofer Mode (with internal low-pass)  
1. Input Left and Right signals from your mixer into Channels 1 and 2.  
2. Set the Filter/Source switch to ON.  
3. Adjust the Low Pass Frequency control, with music playing, to find the setting that delivers the best sound from your  
subwoofer cabinet(s).  
4. Leave the Subwoofer inputs unused.  
R
4min  
L
4min  
+
-
+
-
+
4min  
-
8  
8Ω  
8Ω  
8Ω  
8Ω  
8Ω  
L
R
SUBS  
(Note: Do not connect a speaker load less than 4to either channel as it can damage your amplifier.)  
• Mains & Subwoofer Mode (with external crossover)  
1. Input main Left and Right signals from your crossover into Channels 1 and 2.  
2. Input subwoofer signal from your crossover into the Subwoofer input.  
3. Set the Filter/Source switch to OFF.  
4min  
4min  
+
-
4min  
+
-
+
R
L
SUB  
-
L
R
8Ω  
8Ω  
8Ω  
8Ω  
8Ω  
8Ω  
L
R
SUBS  
(Note: Do not connect a speaker load less than 4to either channel as it can damage your amplifier.)  
7
 
SPEAKER CONNECTIONS  
• Mains & Monitor Mode  
1. Input main Left and Right signals from your crossover into Channels 1 and 2.  
2. Input Monitor or Aux full-range signal from your mixer into the Subwoofer input.  
3. Set the Filter/Source switch to OFF.  
4min  
AUX SEND/  
MONITOR  
4min  
4min  
+
-
+
-
R
L
+
-
8Ω  
8Ω  
8Ω  
8Ω  
MONITORS  
SOUND REINFORCEMENT  
8Ω  
8Ω  
L
R
(Note: Do not connect a speaker load less than 4to either channel as it can damage your amplifier.)  
8
 
S P E C I F I C AT I O N S  
1. OUTPUT SECTION  
Power Output (all channels driven simultaneously, 1% THD)  
Channel 1 & 2 ....................................................................................................................................................................300W RMS per side @ 8  
450W RMS per side @ 4Ω  
Subwoofer ........................................................................................................................................................................................550W RMS @ 8Ω  
800W RMS @ 4Ω  
Ch 1 & 2 “Touch-proof” binding posts (banana jack) outputs  
Damping Factor (20Hz – 400Hz @ 8)..............................................................................................................................................................> 250  
Slew Rate (1KHz @ 2 x 4) ..........................................................................................................................................................................6.5V / uS  
Frequency Response ................................................................................................................................................................10Hz ~ 50KHz (- 2dB)  
THD + Noise........................................................................................................................................................................................................0.04%  
S/N Ratio ...................................................................................................................................................................................................... - 86dBm  
Noise Floor .......................................................................................................................................................................................................... 3mV  
Total Gain..............................................................................................................................................................................................................40dB  
Amplifier Protection ............................................Four variable speed fans for cooling; Power On/Off relay; RF protection; DC offset protection circuits;  
thermal overload protection; short circuit protection  
2. INPUT SECTION  
Sub, Ch 1 & 2 balanced XLR and 1/4” TRS  
Input Impedance balanced / unbalanced ................................................................................................................................................40K/ 20KΩ  
Sensitivity (level control set to max)  
Ch 1 & 2 balanced / unbalanced............................................................................................................................-3.8dBm, 500mV / +2.2dBm, 1V  
Sub balanced / unbalanced ................................................................................................................................-2.1dBm, 600mV / +3.8dBm, 1.2V  
Max Input Level (Level control set to Mid)............................................................................................................................................>5V, +16.2dBm  
Controls ....................................................................................................................................................................Rear: Filter/Source selector, Low Cut  
Front: Power switch, Ch A & B Level controls  
Low Pass Filter ................................................................................................................................................adjustable 50Hz – 250Hz (-12dB/octave)  
Low Cut (high pass filter) ........................................................................................................................................................fixed 30Hz (-12dB/octave)  
LED Indicators  
Sub, Ch 1 & 2 Signal ................................................................................................................................................3 x green LED light at 110mV  
Sub, Ch 1 & 2 Clipping ..................................................................................................................................3 x red LED light 3dB before clipping  
Sub, Ch 1 & 2 Protect ..........................................................................................................................................................................3 x Red LED  
Power On..............................................................................................................................................................................................1 x Blue LED  
3. GENERAL  
Power Requirements ....................................................................................................................................................................................115VAC/60Hz  
Fuse Requirements ....................................................................................................................................................3AG 20A 250V glass tube fast-blow  
Weight ........................................................................................................................................................................................................46.2 lbs. (21Kg)  
Dimensions (HWD) ..........................................................................................................................................3.5” x 19.0” x 17.2” (88.8 x 483 x 436mm)  
The specifications above are correct at the time of printing of this manual. For improvement purposes, all specifications for this unit, including design  
and appearance, are subject to change without prior notice.  
9
 
N OT E S  
10  
 
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 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 WILL ALSO VOID THE WARRANTY.  
NADY SYSTEMS, INC. • 6701 SHELLMOUND STREET, EMERYVILLE, CA 94608  
Tel: 510.652.2411 • Fax: 510.652.5075 • nady.com  
 

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