Nady Systems Home Theater System PRA 8 User Manual

O W N E R ’ S M A N U A L  
PRA-8  
8 CHANNEL MICROPHONE PREAMPLIFIER  
 
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.  
3
 
INSTALLATION  
To ensure years of enjoyment from your NADY AUDIO PRA-8, please read and understand this manual thoroughly before  
using the unit.  
INSPECTION  
Your PRA-8 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  
PRA-8 (verify that the units serial number is same as shown on shipping carton)  
AC Power cord  
Warranty Card  
RACK MOUNTING  
The PRA-8 fits into one standard 19" rack unit of space (1 3/4"). Parts of the unit can become very warm during use. This is normal  
during operation. Care should be taken to ensure that there is enough space around the unit for cooling (at least 12or 30cm). Do not  
place the PRA-8 on high temperature devices such as power amplifiers, etc., or the unit may overheat in operation. Also, do not place  
the unit on speakers as this may cause them to move and/or fall due to speaker vibrations.  
Although the units chassis is shielded against radio frequency (RF) and electromagnetic interference (EMI), extremely high fields of RF  
and EMI should be avoided.  
POWER CONNECTION  
The PRA-8 has an internal power supply and is designed to operate from an external AC source. Power requirements for electrical  
equipment differ from area to area. Be sure to confirm that the voltage selected by the voltage selector switch on the back panel is  
proper for your area (120VAC/60 Hz or 230VAC/50Hz) per the information below:  
Europe (except UK): 230V, 50Hz  
UK and Australia: 240V, 50Hz  
USA and Canada: 120V, 60 Hz  
For other areas, please check with local authorities.  
When ready to operate, plug the AC cord into the power source. Make sure that the unit is turned off before connecting to the AC  
power source to avoid possible loud transients which can damage your speakers or your ears, especially when monitoring with  
headphones.  
4
 
FRONT & REAR CONNECTIONS  
(2)  
(3)  
(1)  
(4)  
FRONT PANEL  
REAR PANEL  
(9)  
(6)  
(7)  
(8)  
(5)  
FRONT PANEL  
(1) AUDIO INPUTS  
REAR PANEL  
(5) AUDIO OUTPUTS  
Eight balanced XLR audio input jacks  
Eight balanced output 1/4TRS jacks  
(6) POWER CONNECTOR WITH FUSE HOLDER  
This standard IEC power cord receptacle is used to connect the  
AC power to your unit. It features a built-in fuse holder for a  
5X20mm, 0.5A/250V slow-blow fuse. If the fuse continuously  
blows, shut off the unit and have it serviced by qualified service  
personnel.  
CONTROLS & INDICATORS  
FRONT PANEL  
REAR PANEL  
The PRA-8 has eight independent pre-amplifier channels. The  
unit provides variable rotary gain controls, phantom power and  
peak indicator lights per channel.  
(8)  
POWER SWITCH  
To turn the unit ON or OFF, press the upper or lower portion of  
this button as indicated. The front panel POWER LED  
INDICATOR (4) will illuminate when the power is ON. Before  
turning on this unit, verify connection to the proper voltage AC  
source, check all connections and turn down the level controls of  
equipment connected to the outputs.  
(2)  
GAIN CONTROLS  
Each channel features a rotary gain control for variable  
adjustment of the desired pre-amplifier level.  
(3)  
PHANTOM POWER SWITCHES  
If needed to power condenser microphones, each channel  
features a phantom power switch for supplying +48VDC across  
pins 2 and 3 of the XLR input connector. If you dont need  
phantom power, be sure to turn this switch to the OFFposition.  
(6)  
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).  
(Note, It is safe to connect balanced dynamic mics even if this  
switch is on, but connecting unbalanced devices or devices  
whose transformers are center grounded will cause hum or  
malfunctions. Shorting the +48VDC can also damage your  
PRA-8. Also, mute any connected Monitor/PA speakers when  
turning the phantom power on or off.)  
(Note: use at the improper voltage can damage your unit and  
void the warranty.)  
(4)  
POWER LED INDICATOR  
This LED indicator illuminates when the unit is powered on by the  
rear panel POWER SWICH (8).  
(9)  
CHANNEL PEAK (CLIP) LED INDICATORS  
This LED indicator illuminates when that channels pre-amplifier is  
overloaded. To avoid distortion, turn down the GAIN (2) control  
for the selected channel until the peak clip light is no longer  
illuminated.  
5
 
APPLICATIONS  
USING THE PRA-8  
It is as simple as ABC to use and operate the PRA-8. Each of the eight pre-amplifier channels has its own INPUT (1) and OUTPUT (5)  
and variable GAIN (2) control.  
A. Connect a signal you wish to process to one of the XLR balanced INPUTS (1) on the front of the PRA-8.  
B. Connect the corresponding channel OUTPUT (5) on the rear of the PRA-8 to your desired destination (mixer, recorder, etc).  
C. Adjust the variable GAIN (2) control of that channel to the desired pre-amplified level. To ensure that you do not over pre-  
amplify your signal, a PEAK (CLIP) LED INDICATOR (9) has been provided on the front panel of the PRA-8 for each channel.  
When illuminated, this LED indicates that the pre-amplifier for that channel is overloaded and that distortion may result. Turn  
down the variable GAIN (2) control for the selected channel until the PEAK (9) LED is no longer illuminated.  
SPECIFICATIONS  
POWER SUPPLY  
AUDIO INPUTS & PRE AMPS  
Power Requirements ....................... selectable, ~ 100-120 VAC,  
~ 200-240 VAC, 50-60 Hz  
Fuse ...................................... 100-120 VAC: 630 mA (slow-blow)  
200-240 VAC: 315 mA (slow-blow)  
Connectors .............................................................................XLR  
Type ...............................................................................Balanced  
Impedance ..................................................................... 2k Ohms  
Min Sensitivity ..................................................................... -40dB  
Peak input level.................................................................... +5dB  
Gain control range ............................................................... 50dB  
Peak amplification ................................................................ 74dB  
Phantom power ..................................................+48V, switchable  
100-240 VAC: 500 mA (slow-blow)  
5X20mm glass type  
Power cord connector ........................... Standard IEC receptacle  
with built-in fuse holder  
PHYSICAL  
AUDIO OUTPUTS  
Dimensions ....................1.75"X 19"X 8.5(44.5X482.6X217mm)  
Weight .................................................................. 7.48lbs (3.4Kg)  
Connectors ...................................................................... 1/4" jack  
Type ...................................................................... TRS Balanced  
Impedance ................................................................... 600 Ohms  
Peak output level ............................................................ +18.5dB  
DISTORTION, FREQUENCY RESPONSE,  
S/N RATIO & CROSSTALK  
Frequency response ................................ 20Hz~20kHz, 0dB~-2B  
Distortion ............................................................................ 0.02%  
S/N Ratio........................................................... Better than 80dB  
Crosstalk rejection .............................>70dB@1kHz; -20dB input  
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.  
6
 
NOTES  
7
 
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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