Nady Systems PRA-8 Stereo Amplifier User Manual
Contents
1. pe wu ae E OWNER 5 MANUAL o nac 4 PEAK E mm POWER 8 Channel Mic Pre Amplifier C PEAK ot po PEAK AUDI SES PHANTOM O a PHANTOM PHANTOM PHANTOM O PHANTOM PHANTOM O 48VDC 48VDC 48VDC 48VDC 48VDC 48VDC 48VDC 48VDC PHANTOM PHANTOM 8 CHANNEL MICROPHONE PREAMPLIFIER 8 CHANNEL MICROPHONE PREAMPLIFIER Congratulations on your choice of microphone preamplifier you have purchased one of the finest stereo microphone preamplifiers on the market today This unit was developed using the expertise of professional sound engineers and working musicians You will find that your new NADY AUDIO PRA 8 has superior performance and greater flexibility than any other microphone preamplifiers 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 microphone preamplifier FEATURES The PRA 8 is a professional multi purpose 8 channel microphone preamplifier designed for the most exacting world class studio applications yet affordable enough for home project studios e Solves many of the connectivity problems arising in studio and Individual gain control and Peak LED indicator on each channel live sound applications from using increasingly popular digital with up to 75dB of gain audio interfaces which often only consist of unbal2. Gall conto Tanga anni 50dB 5X20mm glass type Peak 74dB Power cord connector Standard IEC receptacle Phantom power 48V switchable with built in fuse holder AUDIO OUTPUTS PHYSICAL COMECIO Suri E 1 4 jack Dimensions 1 75 X 19 X 8 5 44 5X482 6X21 7mm jug TRS Balanced 7 4816 3 4Kg Impedance unse ker 600 Ohms Peak level c odes it eria am 18 5dB DISTORTION FREQUENCY RESPONSE S N RATIO amp CROSSTALK Frequency response 20Hz 20kHz OdB 2B A rp 0 02 SN ALO aec A Better than 80dB Crosstalk rejection gt 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 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 service nady com 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 MADY NADY SYSTEMS INC 6
3. for the proper voltage for your area 115v 60Hz or 230V 50Hz Note use at the improper voltage can damage your unit and void the warranty 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 AUDIO INPUTS amp PRE AMPS POWER SUPPLY CODPeCLOIS stan iia XLR Power Requirements selectable 100 120 VAC jug E Balanced 200 240 VAC 50 60 Hz ene i ortu mudo ocn e ML cd 2k Ohms A 100 120 VAC 630 mA slow blow MINSA een 40dB 200 240 VAC 315 mA slow blow eek 5dB 100 240 VAC 500 mA slow blow
4. 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 FRONT amp REAR CONNECTIONS O el a 0 1 2 4 R Mic Pre Amplifier e o d n jade in China WARNING TO REDUCE THE RISK OF FIRE ELECTRONIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE 6 N 8 5 FRONT PANEL 1 AUDIO INPUTS Eight balanced XLR audio input jacks 3 9 REAR PANEL 5 AUDIO OUTPUTS Eight balanced output 1 4 TRS 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 amp INDICATORS FRONT 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 2 GAIN CONTROLS Each channel features a rotary gain control for variable adjustment of the desired p
5. 701 SHELLMOUND STREET EMERYVILLE CA 94608 Tel 510 652 2411 Fax 510 652 5075 www nady com
6. CAUTION DO NOT OPEN ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL 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 2 11 Read all 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 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 an audiologist The product should be positioned so that proper ventilation is maintained The product should be located away from heat sources such as radiators heat vents or other devices including amplifiers that produce heat The product should be connected to a powe
7. 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 e Instruction manual PRA 8 verify that the unit s 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 12 or 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 unit s 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
8. anced line inputs or very low or no mic pre gain structure for the balanced input stage and with no available phantom power 48V Phantom Power with individual Phantom On Off switches and Phantom Power On LED indicators on each channel e Eight totally independent world class preamps in one single rack HOO eo teme nO 1 RU through package with servo balanced XLR inputs and Shielded internal dual regulated power supply with 1 4 TS outputs for each preamp 115V 60HZ 230V 50Hz select switch and fused IEC power e Highest quality components and advanced design with ultra cord connector linear high bandwidth operational amps for no compromise crystal clear audio with exceptionally low noise and negligible distortion TABLE OF CONTENTS FEATURES cc an 2 INSTALLATION 0 8 000 4 Dealer s Name FRONT amp REAR PANEL CONNECTIONS 5 ity CONTROLS amp INDICATORS cscssscescessstsseeceesseesessatesessatesses 5 APPLICATIONS coccion 6 State 2 1 Using the dal cR 6 Model SPECIFICATIONS creto 6 NOTES A roo p e 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
9. r 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 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 Care should be taken so that objects do not fall into and liquids are not spilled through the enclosure s openings The product should be serviced by qualified service personnel if 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 moO U gt The product has been dropped or the enclosure damaged 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 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
10. re 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 don t need phantom power be sure to turn this switch to the OFF position 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 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 channel s 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 REAR PANEL 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 69 AC VOLTAGE SELECTOR SWITCH Before plugging in the power cord check to see that the unit is set
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