Nady Systems Stereo Amplifier XA 300 User Manual

OWNER’S MANUAL  
XA-300  
STEREO POWER AMPLIFIERS  
 
XA-300  
S T E R E O P O W E R A M P L I F I E R  
Congratulations on your choice of the NADY AUDIO XA-300 stereo power amplifier — you have purchased one of the finest stereo  
amplifiers on the market today. This unit was developed using the expertise of professional sound engineers and working musicians.  
You will find that your new XA-300 amplifier has superior performance and greater flexibility than any other amplifiers in its price  
range. Please read this manual carefully to get the most out of your new unit.  
Thanks for selecting NADY AUDIO as your choice in stereo power amplifiers.  
FEATURES  
Offering top power, superior performance and full professional operating features in a roadworthy compact chassis, the XA-300  
amplifier is perfect for even the most demanding sound reinforcement installation and touring applications.  
• Full operating features: volume controls; parallel balanced XLR and 1/4" TRS inputs; stereo (dual channel), parallel-input, or bridged  
mono operating modes with selector switch; binding post (banana plug) outputs  
• Full safety/reliability features: 3 variable speed fans for cooling; soft-start turn on, noise-free on-off; built-in DC offset; independent  
DC and thermal overload protection on each channel; short circuit and speaker protection; built-in current limiter  
• Power ON and Protect LED’s; Signal and Clipping LED indicators for each channel  
• Switching power supply for most reliable operation and lightweight portability  
• Roadworthy, rugged double rack space (2U) housing  
• ~115(60Hz)/~230V(50Hz) AC select switch and IEC power cord connector with built-in fuse  
• XA-300 - 2 x 150W @ 4, Bridged mono: 300W @ 8(2and 4Bridged not recommended)  
TABLE OF CONTENTS  
FEATURES ................................................................................. 3  
WARNING................................................................................... 4  
FRONT & REAR PANEL CONNECTIONS ................................ 5  
INSTALLATION .......................................................................... 6  
CONNECTIONS.......................................................................... 7  
BLOCK DIAGRAM ..................................................................... 9  
SPECIFICATIONS .................................................................... 10  
Date of Purchase ____________________________________  
Dealer’s Name ______________________________________  
City _______________________________________________  
State _____________________ Zip _____________________  
Model # ____________________________________________  
Serial # ___________________  
3
 
WARNING  
An equilateral triangle enclosing a lightening 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 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  
outlets or extension cords 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 enclosures openings.  
10. The product should be serviced by qualified service personnel if:  
A.  
B.  
C.  
D.  
E.  
The power supply cord or the plug has been damaged.  
Objects have fallen into, or liquid has been spilled onto the product.  
The product has been exposed to rain.  
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.  
4
 
FRONT & REAR CONNECTIONS  
6
4
3
1
2
5
FRONT PANEL  
(Note: Operating the amplifier at hard clipping can result in  
overheating or may damage your amplifier over a period of time.  
Amplifiers that are damaged due to such user neglect, or  
improper operation, are not covered under warranty.)  
1. POWER SWITCH  
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.  
4. SIGNAL LED INDICATORS  
These LEDs illuminate to confirm the presence of an input signal  
greater than 100 mV at that channel of the amplifier  
(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.)  
5. PROTECT LED INDICATOR  
2. POWER LED INDICATOR  
This LED illuminates if the power amplifiers output connection is  
shorted or the load impedance is too low. When the LED is lit, turn  
OFF the power and check the outputs connection to verify that it  
is correct, then turn ON the power again.  
This LED illuminates when the power is turned ON.  
3. CLIP (PEAK) LED INDICATORS  
These LEDs illuminate if any section of the power amplifiers  
output are within 3dB of clipping. Occasional blinking of the LEDs  
are acceptable, but if they remain on more than occasionally you  
should turn down either the power amplifiers level controls or  
reduce the output level of the preceding component to avoid  
audible distortion or hard clipping.  
6. LEVEL CONTROLS  
These control the level of signal coming into each channel. The  
actual voltage gain of the amplifier is shown in dB. Turn these  
controls counterclockwise if the peak LEDs illuminate steadily  
(indicating too strong an input signal).  
BACK PANEL  
13  
7
11  
12  
10  
9
8
serviced by qualified service technician. 115V AC ~6A 250V  
FB; 230V AC ~4A 250V FB  
7. POWER CONNECTOR  
The cord connector is used to connect the AC power source to  
your power amplifier.  
(CAUTION: DO NOT REMOVE THE CENTER GROUNDING  
PIN.)  
9. 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). A cover plate is provided to ensure that this switch is not  
accidently reset or tampered with between uses.  
8. FUSE  
If this fuse blows continuously, shut off the unit and have it  
5
 
FRONT & REAR CONNECTIONS  
internally connected, so that you only need to feed a signal into  
10. L/R CHANNEL OUTPUT CONNECTORS  
one of the channels. This still allows independent control of  
each channel. (Note: Do not select this Parallelmode when  
feeding the amplifier 2 separate signals.)  
Connections are as depicted on the rear panel and in the follow-  
ing CONNECTIONS section on page 7 of this manual.  
(Note: Do not use both unbalanced and balanced cables in the  
same set-up as that can unbalance all the connections when  
daisy-chaining, resulting in hum.)  
11. BALANCED INPUT CONNECTORS (1/4" TRS & XLR)  
These 1/4" (6.3mm) TRS (Tip/Ring/Sleeve) phone jacks and XLR  
jacks are compatible with balanced inputs and are wired as Tip/  
Pin 3, Ring/Pin 2, and Sleeve/Pin 1 = Ground. Normal maximum  
input level at clipping is .500V RMS. Input impedance is 50K  
Ohms. Since the TRS phone jacks and XLR jacks are wired  
internally in parallel, you can parallel this unit with another  
amplifier by using either the LINE 1/4" jack or the XLR jack  
(depending on which youre using to input your signal) to output  
the signal to the input jack of the other amplifier.  
The 1/4" TRS phone jacks can also be used for unbalanced  
inputs. For TRS phone plugs, simply connect the unused side of  
the balanced input to ground. For 1/4" TS phone plugs, no change  
is necessary for compatibility with this input. Balanced input  
signals are recommended as they are less prone to AC hum. For  
long cable runs a source of less than 600 ohms output impedance  
is needed to avoid signal loss. For short cable runs an unbalanced  
signal input should be suitable.  
• STEREO INPUT - This is the most common mode generally  
used, and allows independent control of 2 separate signals  
such as stereo playback, main and monitor live mixes, and bi-  
amp operation (highs in one channel and lows in the other).  
• BRIDGED MONO - This mode combines the power of both  
channels to drive a single speaker. In this mode the amp  
produces 4 times the peak power and 3 times the sustained  
power into a 4 or 8 ohm speaker than each channel can deliver  
separately in stereo or parallel mode.  
(CAUTION: In this mode the amplifier can deliver high power  
into a speaker. Make sure that the speaker, connectors and  
wiring can handle this output. Note that for prolonged  
overdriven outputs into a 4 ohm speaker the breaker may trip,  
so care must be taken not to overload the amplifier in such  
operation.)  
Connect the input signal to CH-A input for bridged mono  
operation.  
For stereo (two-channel) operation, use the inputs for both CH-A  
and CH-B; for parallel or bridged mono operation, use only CH-A  
input. (See MODE SELECTOR SWITCHES below for more  
explanation.)  
13. FANS  
The variable speed fans switch between idle speed and high  
speed automatically to maintain the proper internal operating  
temperature.  
12. MODE SELECTOR SWITCH  
The XA-300 amplifier offer 3 modes of operation: PARALLEL,  
STEREO & BRIDGED. Slide the switch to one of the three  
positions for you application.  
• PARALLEL (MONO) INPUT - This mode allows both chan-  
nels to operate in parallel with the same signal and without  
requiring a Y-cord. In this mode the inputs for both channels are  
INSTALLATION  
To ensure years of enjoyment from your NADY AUDIO XA-300 amplifier, please read and understand this manual thoroughly before  
using the unit.  
INSPECTION  
RACK MOUNTING  
Your XA -300 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.  
The XA-300 amplifier is designed for standard 19" rack mounting  
as well as stackmounting 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.  
(Note: Nady Systems is not responsible for shipping damage. If  
the unit is damaged, do not return to us, but notify your dealer and AMPLIFIER COOLING  
the shipping company immediately to make a claim. Such claims  
must be made by the consignee in a timely manner.)  
Also pay close attention to the cooling requirements. Never block  
the air vents in the back side and front of the amplifier if the load  
seen by amplifier is less than 4 ohms and the amplifier is being  
run at high output levels. For best results, in such high output  
power applications you should augment the amplifiers air flow  
with a rack cooling system.  
CONTENTS  
Instruction manual  
XA-300 (verify that the units serial number is same as shown on  
shipping carton)  
AC Power cord  
Warranty Card  
6
 
CONNECTIONS  
The following instructions describe the most common ways to install your amplifier into a sound system.  
1. Turn off the amplifier power switch before making any connections.  
2. The XA-300 amplifier maybe operated in one of three modes (stereo, bridged-mono, and parallel mono). Refer to the  
following wiring diagrams for the speaker connections you wish to make.  
(Note: Nady Systems assumes no liability for damaged speakers resulting from improper wiring, careless amplifier use, or  
over powering.)  
• Stereo (Two-Channel) Mode  
To put the amplifier into stereo mode, first turn the amplifier off, then slide the MODE SELECTOR SWITCH (12) to the middle  
STEREOposition, and properly connect the input/output wiring as shown.  
(Note: Do not connect a speaker load less than 2 ohms as it can damage your amplifier.)  
CHANNEL A  
CHANNEL B  
7
 
CONNECTIONS  
• Parallel (Mono) Mode  
To put the amplifier in parallel-mono mode, first turn the amplifier off, then slide the MODE SELECTOR SWITCH (12) to the bottom  
PARALLEL (MONO)position and properly connect the input wiring as shown. A signal into any input jack will drive both channels  
directly. You can patch the input signal on to any other amps using any of the remaining input jacks.  
(Note: Do not connect a speaker load less than 2 ohms as it can damage your amplifier.)  
[Note: Do not use the PARALLEL (MONO)switch when feeding the amp 2 separate signals.]  
CHANNEL A  
To additional amplifier(s)  
for daisy-chainig  
• Bridged Mono Mode  
To put the amplifier in bridged mono mode, turn the amplifier off and slide the MODE SELECTOR SWITCH (12) toward the top  
BRIDGEDposition and properly connect the input/output wiring as shown. The signal is input into CH-A. Keep the level control of  
channel Bturned completely down (counter clock wise).  
(Note: Do not connect a speaker load of less than 8 ohms as it can damage your amplifier.)  
(Note: This mode produces a large amount of power. Be sure that your wiring and speaker can handle it.)  
CHANNEL A  
Do Not Use  
8
 
BLOCK DIAGRAM  
9
 
SPECIFICATIONS  
POWER SPECIFICATIONS  
OUTPUT POWER ......................................................................................................................................... 120W RMS @ 8per side  
(EIA 1KHz 1% THD)  
150W RMS @ 4per side  
300W RMS @ 8bridged  
Minimum 4per side, 8bridged  
ELECTRICAL SPECIFIACTIONS  
INPUT SENSITIVITY ............................................................................................................................................... .500V RMS (-4dBu)  
INPUT IMPENDANCE ............................................................................................................................ 50KUnbalanced & Balanced  
FREQUENCY RESPONSE (at 10dB below rated output power) ............................................................................. 20Hz~20KHz 1dB  
5Hz~50KHz 3dB  
DISTORTION (SMPTE-1M) ............................................................................................................................................................ <.1%  
S/N RATIO .................................................................................................................................................................................... 100dB  
GENERAL SPECIFIACTIONS  
PROTECTIONS .......................................................................... Full short circuit, open circuit, thermal, ultrasonic, and RF protection;  
stable into reactive or mismatced loads; ON/OFF muting; current limiter  
FRONT CONTROLS ................................................................................................. Power switch, input level control for each channel  
REAR PANEL CONTROLS........................................................................... Parallel/Mono/Bridge selector, AC voltage selector switch  
CONNECTORS........................................................ Power; IEC power cord jack; Input:: Active balanced XLR and 1/4(6.3mm) TRS  
Output: Touch-proofbinding posts  
POWER SUPPLY..................................................................................... Voltage selectable: 110V~120V or 220V~240V AC 50/60 HZ  
FUSE......................................................................................................................... 115V AC ~ 6A 250V FB; 230V AC ~ 3A 250V FB  
DIMENSIONS ............................................................................................................................ 19x 12.4x 3.5(483 x 315 x 89 mm)  
WEIGHT .......................................................................................................................................................................... 13 lbs. (5.9Kg)  
The specifications above are correct at the time of printing of this manual. For improvement purposes, all specifications for this unit,  
including design and apperance, are subject to change without prior notice.  
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 www.nady.com  
 

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