Nady Systems HPA-4 Stereo Amplifier User Manual
Contents
1. MAA WS OS A m uma oo eo oo oQ LINE AS WML eS NA mis gt nPA 4 4 CHANNEL HEADPHONE AMPLIFIER LINE DISTRIBUTOR HPA 4 4 CHANNEL HEADPHONE AMPLIFIER LINE DISTRIBUTOR Congratulations on your choice of headphone amplifier line distributor you have purchased one of the finest stereo headphone am plifier line distributors 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 HPA 4 has superior performance and greater flexibility than any other headphone amplifier line distributors 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 headphone amplifier line distributor FEATURES With extensive switching functions extreme efficiency and unmatched sound quality the ultra versatile HPA 4 is a universal 4 channel multi purpose headphone amplifier line distribution system perfect for the most demanding professional stage and studio applications Four totally independent stereo high power headphone ampli e Separate Volume control for each channel adjusts the level to fier line distribution channels in a convenient single rack pack both Phone and parallel Line outputs age an ingenious easy to operate unit allowing a maximum variety of both useful monitoring and stereo line level signal dis tribution options Easily e2. To turn the unit ON or OFF press the upper or lower portion of this button as indicated The front panel POWER LED INDICA TOR 6 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 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 Note use at the improper voltage can damage your unit and void the warranty APPLICATIONS USING THE HPA 4 AS A HEADPHONE AMPLIFIER Connect a stereo L amp R program source 2 x 1 4 plugs to the rear of the HPA 4 using one of the available 4 x stereo INPUT 3 pairs on the rear panel Connect a set of headphones using a stereo 1 4 cable to any of the HEADPHONE OUTPUTS 1 on the front panel of the HPA 4 Select the source signal from the rotary SELECTOR 4 switch for the channel in use Set to an appropriate level for monitoring Note If only the LEFT MONO channel input is used the mono signal will be provided automatically at both the Left and Right sides of the PHONE 1 and LINE 2 outputs Since the HPA 4 offers four independent channels you can have four individual mixes for four musicians with a single unit In studio recording applications you can configure sub groups aux sends or single outputs
3. 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 HPA 4 please read and understand this manual thoroughly before using the unit INSPECTION Your HPA 4 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 HPA 4 verify that the unit s serial number is same as shown on shipping carton e AC Power cord e Warranty Card RACK MOUNTING The HPA 4 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 HPA 4 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 th
4. fier 6 State Zp 2 Using the HPA 4 as a line distribution Unit sss eee ee 6 Model 3 Daisy chaining multiple HPA 4 s together for additional headphonelline distribution requirements 6 Serial SPECIFICATIONS cinc 6 NOTES ns 7 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 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 wit
5. h 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 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 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 0 gt The product
6. is 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 HPA 4 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 FRONT 4 REAR CONNECTIONS FRONT PANEL C WARNING TO REDUCE THE RISK OF FIRE OR ELECTRONIC SHOCK DO NOT EXPOS EQUIPMENT TO RAIN OR M 8 9 7 3 E OR MOISTURE FRONT PANEL 1 STEREO HEADPHONE OUTPUTS Four stereo 1 4 output jacks for connecting four stereo head phones 2 DIRECT LINE DISTRIBUTION OUTPUTS Four stereo 1 4 line level output jacks for use for line distribution 5 4 6 OWER Headph
7. ms max 1W O 32 Ohms Output impedance sica do 22 Ohms A O GA O sans 20 dB LINE DISTRIBUTION OUTPUTS GOMIECIONS zn 1 4 jack IPS lite Unbalanced Parallel DISTORTION FREQUENCY RESPONSE S N RATIO amp CROSSTALK BISIOHION As sp a ES esa Ee 0 02 Frequency response eee ee eee 20Hz 20kHz OdB 2B SIN EITE asses eed eee eta asa ce Better than 80dB Crosstalk rejection ee eee gt 68dB 1kHz 20dBinput FUNCTION CONTROLS VOM ici Per channel variable Signal selectors ooonccccccccoconcncnncococononoss Per channel Variable POWER SUPPLY AC requirement eee eee eee Selectable 100 120 VAC 200 240V AC 50 60 Hz Power CONSUMPHON a ias 11 5VA PUSS eee a RR SN 100 120 VAC 630 mA slow blow 200 240 VAC 315 mA slow blow 100 240 VAC 500 mA slow blow 5X20mm glass type Power Cord connector Standard IEC receptacle with built in fuse holder PHYSICAL Dimensions 1 75 X 19 X 8 5 44 5X482 6X217mm Weller rad dls 6 93lbs 3 15Kg 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 plea
8. of your audio mixer to feed signals independently to the HPA 4 This enables each musician to receive a specific configuration of instruments of their choice in their headphones Note If four headphone outputs are not enough you can interface and link any number of HPA 4 s for additional outputs see be low USING THE HPA 4 AS A LINE DISTRIBUTION UNIT To use the HPA 4 as a line distribution unit all you have to do is use the line output instead of the headphone output on the front of the unit for the line distribution signal feed All other operation is identical as using the unit as a headphone amplifier Daisy chaining multiple HPA 4 s together for additional headphone line distribution requirements It is very easy to chain multiple HPA 4 s together Use appropriate single stereo 1 4 TRS to two 1 4 TS 2 x mono adapter cables and make connections from the LINE DISTRIBUTION OUTPUT 2 channels on the front of your first HPA 4 unit to the stereo L amp R AUDIO INPUTS 3 on the rear of your second HPA 4 This effectively allows an additional fully selectable 4 headphone outputs and an additional 4 line outputs You can continue to chain up to four HPA 4 units together using this same procedure SPECIFICATIONS AUDIO INPUTS BONNEGIOrS ee ehe 1 4 jack Type ee re Unbalanced Impedance 2 47k Ohms Peak Input level ui een 25dB Ex ee 35dB HEADPHONE POWER AMPLIFIER OUTPUTS Max output level 300mW 32 Oh
9. one Amplifier e INPUTS 9 LEFT MONO REAR PANEL 3 AUDIO INPUTS Four stereo pair balanced line level 1 4 TRS jacks for 4 stereo L amp R input signals If only the LEFT MONO channel input is used the mono signal will be provided automatically at both the Left and Right sides of the PHONE 1 and LINE 2 outputs 8 POWER CONNECTOR WITH FUSE HOLDER Standard IEC power cord receptacle 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 HPA 4 has four independent headphone amplifiers or line distribution channels The unit provides 2 rotary controls and 2 stereo jacks per channel 4 INPUT SIGNAL SOURCE SELECT SWITCHES Each channel features a rotary selector switch which allows you to select any of the 4 stereo input source signals connected to the INPUTS 3 of the HPA 4 to be routed to the selected chan nels of the headphone amplifier and line distribution output Sim ply choose the source signal desired for that channel 5 VOLUME CONTROLS Each channel features a rotary volume pot for variable adjust ment of the desired output level 6 POWER LED INDICATOR This LED indicator illuminates when the unit is powered on by the rear panel POWER SWITCH 7 REAR PANEL 7 POWER SWITCH
10. se 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 MAD Y NADY SYSTEMS INC 6701 SHELLMOUND STREET EMERYVILLE CA 94608 Tel 510 652 2411 Fax 510 652 5075 www nady com
11. xpandable for optimum versatility in any application up to four HPA 4 s can be daisy chained for additional fully select able headphone line distribution requirements Input Source Select switches and Phone and Line 1 4 TRS ste reo outputs on each channel and 4 independent stereo input sections each with servo balanced L amp R 1 4 TRS jacks en able independent selection of any of the 4 stereo signals for each headphone amp line distribution channel This allows se lecting from up to 4 completely independent monitor signals for High quality rugged construction for maximum reliability each set of headphones connected to the HPA 4 for optimum monitoring flexibility or 4 separate choices for each channel s Line Output for enabling many useful simple audio switching routing solutions TABLE OF CONTENTS No compromise circuit design stringently selected tight toler ance components and low noise extremely linear or amps for reference quality transparent audio with maximum headroom even at extremely high headphone volume levels Shielded internal dual regulated power supply with 115V 60Hz 230V 50Hz select switch and fused IEC power cord connector WARNING agi ee 3 Date of Purchase INSTALLATION us 4 FRONT amp REAR PANEL CONNECTIONS sssssssscssssssssseeseeees ES CONTROLS amp INDICATORS cccccooocnncancnnccnnnncnnnananannnnanennnnnnnas 5 City APPLICATIONS u ee 6 1 Using the HPA 4 as a headphone ampli
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