CVA50-1 Priority PA - Manual (Print).pub
Contents
1. Ground Shield Connector enlarged to show detail NOTE The CVA50 1 Priority PA amplifiers does not accept TRS inputs wired for a stereo source TRS inputs should only be used for balanced mono inputs 2 4 2 Unbalanced Input Connections When using an unbalanced input source and connector a jumper must be added between the negative terminals and the ground terminals Once this has been done the unbalanced source can be connected to the positive and ground terminals Please refer to the manual of your input source in case it does not follow the standard pin out For your convenience pre wired connectors are available for purchase see the next page for details T NOTE A jumper is required for connecting an unbalanced input Input Connector 4 a Male RCA Ground o Shield A jumper has been added between the negative terminals and ground Input Connector 4 o ia Male TS A jumper has been added between the negative terminals and ground Ground Shield NOTE The CVA50 1 Priority PA amplifiers does not accept A stereo inputs Either one side must be selected from the stereo source or an overload protected Y cable must be used to sum them to mono It is highly recommended that you purchase the pre wired connectors mentioned on the next page Damage to source equipment can result from 10 Pre wired unbalan2. In the spaces provided below record the model and serial number located at the rear of your amplifier Model No Serial No Purchase Date Retain this information for future reference 27
3. 0 54kg Stewart Audio reserves the rate to change features and specifications without notice 22 6 Warranty Information 6 1 Warranty Summary All Stewart Audio amplifiers and accessories unless excluded in this summary are covered by a 3 year limited warranty on parts and labor from the data of purchase In order to be eligible for warranty repairs the amplifiers and accessories must have been purchased through an authorized Stewart Audio dealer and submitted by the original purchas er This warranty is only valid in the country in which the amplifier was purchased 6 1 1 Eligibility Requirements Stewart Audio warrants against all malfunctions which come as a result of component or manufacturer defect The amplifier is also covered from all failures which arise during the warranty period 3 years from date of purchase that are not a result of misuse The following actions will void your warranty e The power cord or AC plug has been damaged through misuse e The amplifier has been exposed to moisture or extreme tempera tures e The amplifier has been dropped items have been dropped on the amplifier or the enclosure has been damaged e The amplifier has been opened by the operator e The amplifier was improperly packaged when sending to the fac tory for repair resulting in damage e Any of the precautions or instructions found in this manual were not followed Damages resulting to the amplifier which are not covered u
4. 25 6 2 5 Payment of Non Warranty Repair seses 25 7 Accessories 1 Welcome E STEWARTAUDIO The Difference is Hear Congratulations on the purchase of your new Stewart Audio CVA50 1 Priority PA power amplifier This amplifier has been designed and built to provide you with years of high quality audio performance and trouble free operation If after reading this manual you should have any ques tions concerning amplifier installation and operation please contact your Authorized Stewart Dealer or you may contact us directly using the contact information provided on the back of this manual 1 1 Features Your Stewart Audio CVA50 1 Priority PA amplifier is the result of years of experience in the design and manufacture of quality amplifiers As such it provides a combination of performance and operational benefits that simply cannot be found in conventional amplifiers e Sub Compact 1 3 rack package e Constant voltage amplifier 70 7V 100V e Adjustable ducking of local inputs e Microphone input with adjustable pre gain e Remote volume control e External inline power supply e Made in the USA 1 2 Using this Manual In order to obtain maximum performance from your CVA50 1 Priority PA Amplifier please take time to read this brief owner s manual and carefully follow the guidelines for connection and operation This manual provides you with the information necessary to safely in stall and operate your new CVA50 1 Priority
5. and write the RA number on three sides of the box 5 Record the RMA number for future reference The RA number can be used to check the repair status 6 2 3 Packaging Instructions Should Stewart Audio request that you ship your product to their ser vice center these instructions must be followed in order to ensure safe delivery If they are not followed Stewart Audio assumes no responsi bility for damaged goods and or accessories that are sent with your unit 24 6 2 3 Packaging Instructions cont 1 Please write the RA number on three sides of the box Include the Stewart Audio RA number inside the box and a brief description of the problem 2 Do not ship any accessories manuals cords hardware etc with your unit These items are not needed to service your product Stewart Audio will not be held responsible for these items if they are returned with the amplifiers 3 When shipping your amplifier it is important that it has adequate protection We recommend you use the original packing material when returning the product for repair If you do not have the origi nal box see number 4 4 If you provide your own shipping pack the minimum recommend ed requirements for materials are as follows a 275 P S I burst test Double Wall carton that allows for 2 inch solid Styrofoam on all six sides of unit or 3 inches of plastic bubble wrap on all six sides of unit b Securely seal the package with an adequate carton sealin
6. 3 T EWART The Difference is Hear STEWARTAUDIO EVASU 1 PRIORITY PA CVAS0 1 PRIORITY PA Owner s Manual April 2013 Important Safety Instructions Before using your Stewart Audio Inc Power Amplifier please read this Owner s Manual carefully to ensure optimum trouble free perfor mance WARNING TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT EX POSE THIS AMPLIFIER TO RAIN OR MOISTURE DANGEROUS HIGH VOLTAGES ARE PRESENT INSIDE THE ENCLOSURE DO NOT OPEN THE CABINET REFER SERVICING TO QUALIFIED PERSONNEL ONLY CAUTION A A 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 The lighting bolt within arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of un insulated dangerous voltage within the product s enclosure that may be of sufficient mag nitude to constitute a risk of electrical shock to person The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instruction in the literature accompanying the appliance Important Safety Instruction Please Read Prior to Product Installation 1 Installation should be performed by a trained and licensed professional to insure safe and lasting operation All of the safety and operating instructions shoul
7. NNECTIONS virvreerer etter ett tet tient ennees 9 2 4 1 Balanced Input CONNECTIONS eeeseeseereeeterrreerreerree 9 2 4 2 Unbalanced Input CONNecCtiIOnS eere 10 2 4 3 RCA iirc erect et terre treet 11 2 4 4 St rO verter tee errr 12 2 4 5 PA Euro BIOCK s eseeeeereerteeeee teeter eter ener teeters anaes 12 2 5 Output CONNECTIONS verre eee tet ttt teeters 13 2 5 1 Constant Voltage vrei titre 14 2 5 2 Wiring Example ert ti 14 3 Operation 0 00 cece teeter eter eter etre teat ties 15 3 1 Operation Precautions crete ttt eee teee ties 15 3 2 Controls Indicators ANd CONNECHOIS vier eee ettetee 16 3 2 1 INGICATOLS 21 eeee eee eee tee teeter etre 17 3 2 2 CONTIOIS scree etree eet teeter tee eet ee ee tre teet 17 3 2 3 Remote Volume Control e recess 18 3 2 4 PA DUCKING seereerrceetet etter eee e etter cnet tree eet eae es 19 4 Troubleshooting ee eee 20 5 Technical Specifications 0 cc eee 22 6 Warranty Information 0 eee eterna es 23 6 1 Warranty SUMMA sss est teeter etter e teeter tte ee errr ees 23 6 1 1 Eligibility for Factory Repair eecceet tees 23 6 2 Return Procedure tte eevee ter i etnies 24 6 2 1 Return Authorization 1 cceeeeeeceeee etter eeeees 24 6 2 2 Packaging INStrUCTIONS eeeeeeeeeereeet ee et teeters eeees 24 6 2 3 Shipping INStrUCTIONS eet tte tt trees 24 6 2 4 Estimate Approval eeeeeeeeerererserererterernerrrinneneerenne
8. PA amplifier in the most common scenarios If you find yourself requiring additional assistance please feel free to contact your Authorized Dealer or you may contact us directly using the contact information provided on the back of this manual 2 Setup 2 1 Setup Precautions you have read the Important Safety Precautions at the be ginning of this manual CAUTION Before installing your amplifier make sure that 2 2 Amplifier Installation The CVA50 1 Priority PA incorporates a number of different mounting options in order to fit your installation needs 2 2 1 Pole Mount Installation The CVA50 1 Priority PA amplifier casing has mount holes on both the top as well as the side of the unit which can be used with the AV Pole bracket available from Stewart Audio Two screws are included in the kit which will affix the bracket to the top or side of the unit Part Number AV Pole 3 S 2 2 1 Universal Mount Installation The CVA50 1 Priority PA also has a universal bracket available which allows the unit to be mounted against a wall or under a table Two screws are included in the kit which will affix the bracket to the top or the side of the unit Once this is done two holes are available for mounting the unit where desired CAUTION Use only the screws provided in mounting brackets to the amplifier Do not over tighten 2 2 3 Product Dimensions 6 25in n 15 9cm Sa VAAN RI 1 38in CVA50 1 PA Fr
9. and the gauge of wire used is very different Constant voltage systems and speakers use a smaller current flow than the typical 80hm systems and thus can use a higher gauge thinner diameter wire Please refer to the following chart to choose the appro priate wire gauge for your installation Distance Wire Gauge Up to 500ft 22 AWG 500 to 1000 ft 20 AWG Over 1000ft 18 AWG Speaker leads connect by means of removable Euro Block connectors supplied with the unit Strip speaker leads 1 4 and insert leads into connector observing proper polarity With a small flat blade screwdriv er tighten the screw until the leads are held securely in place Inspect for possible shorts or broken wires 2 5 1 Constant Voltage The Euro Block connector on the rear of the amplifier is capable of sup plying output at 70V 2 5 2 Wiring Example The diagram below is a typical wiring setup for two speakers with out board step down transformers wired in parallel to the 70V output op tion of a CVA50 1 Priority PA amplifier Output Connector 70 jl JI 14 3 Operation 3 1 Operating Precautions 1 Before use your amplifier must be configured for proper opera tion including input and output wiring hookup Improper wiring can result in damage to equipment or potentially harm to the operator Consult section 2 for setup instructions 2 Tampering with the circuitry or making unauthorized changes is not only dangerous but may al
10. ced connectors are available for purchase from Stew art Audio These will allow for a quicker installation with less room for error when connecting the CVA50 1 Priority PA amplifier to an unbal anced source The summing adapters will properly sum a stereo source for use with the mono input on the rear of the amplifier without caus ing sound cancellation Part numbers are found below the diagrams ADPT RCA ADPT SUMRCA ADPT SUM35 Mono Stereo Stereo Female RCA Female RCA Female 3 5mm 2 4 3 RCA Input The first input channel is a stereo RCA jack which is then summed to mono before the final output Refer to the diagram below for wiring directions Right g a Shield lt Left E ar D Cw Ground f Shield 2 4 3 Stereo 3 5mm The second input channel is a stereo RCA jack which is then summed to mono before the final output Refer to the diagram below for wiring directions Pe Ground Shield Left Right Ground Shield 2 4 4 25V PA Euro Block The third input channel is a Euro Block connector which can be wired to any unbalanced input Should you be wiring up a stereo source use both the left and right pins of the connector A mono source will only require the use of the ground and left pins 12 2 5 Output Connections Because of the differences in the way that constant voltage amplifiers work as opposed to a typical 8 ohm setup the wiring procedure
11. d be read before the am plifier is installed or operated Retain these instructions for future refer ence All instructions should be followed all warnings on the amplifier and in the operating instructions should be adhered to 10 11 The amplifier should be situated so that its location and position does not interfere with its proper ventilation For example the amplifier must not be placed on a rug bed sofa or similar surface that impedes airflow across the chassis Airflow around the unit should be unobstructed This amplifier should not be used near water for example near a bathtub in a wet basement near a swimming pool etc This amplifier is intended to be operated in a controlled indoor environment Do not place the amplifier near heat sources such as radiators heat regis ters stoves or other appliances that produce heat The amplifier s power supply should only be connected to 120 VAC 60 Hz power source Do not defeat the ground or polarization of the power plug Route power cord and other cables so that they are not likely to be walked on tripped over or stressed Pay particular attention to condition of cords and cables at plugs and at the point where they exit the amplifi er To prevent risk of fire or injury damaged cords and cables should be replaced immediately Clean the amplifier with a clean damp cloth Do not use solvents or abra sive cleaners Never pour any liquid on the amplifier When lef
12. e front of the amplifier to see if the signal is over driving the Clip light flashes red frequently Overdriving the amplifier for extended periods of time can cause a thermal shutdown 20 4 Troubleshooting Cont Problem Output sound is distorted or cracking Procedure Check all cables for damage or loose connections and re duce the gain on the input signal at the mixer or preamp level Replace the cables and loudspeakers temporarily to see if this resolves the problem If problem still exists contact your Authorized Dealer for ser vice 21 5 Technical Specifications Maximum Output 30Hz 20kHz CVA50 1 Priority PA Frequency Response 0 3 dB Power Bandwidth 3dB THD N Signal to Noise Ratio Remote Volume Control Input Sensitivity Standard Voltage Gain Input Impedance Balance Unbalanced Sleep Idle Current Draw 1 8 Draw Class Input Connectors Output Connectors Power Supply Cooling Controls LED Indicators Construction Plenum Rating Dimensions Height Width Depth Weight 50W 70V 100Hz 20kHz 80Hz 30kHz lt 0 1 gt 80dB 0 10V DC 4 pin Block 5V 3 dBV 151X 43dB 70 7V 20k Ohms 10k Ohms 0 005 0 01 0 15 Amps D Mic 8 pin Euro Block RCA 3 pin Euro Block 25V 2 pin Euro Block Euro Block 2 pin External In Line 48DVC Convection Cooling Level Power Signal Clip Aluminum Chassis UL 2043 Approved 1 38in 3 5cm 6 25in 15 9cm 4 13in 10 5cm 1 2 lbs
13. g tape c Do not use light boxes or peanuts NOTE Damage caused by poor packaging will not be covered un der warranty 6 2 4 Estimate Approval An estimate for all non warranty repairs will be provided to the custom er once the unit has been shipped to the factory The customer is re sponsible to approve this estimate within 7 days If the repairs are not approved within 14 days Stewart Audio reserves the right to consider the unit scrap and may discard it 6 2 5 Payment of Non Warranty Repairs Payment for non warranty repairs must be submitted to Stewart Audio before the product will be returned to the customer 25 7 Accessories The following accessories are available from Stewart Audio for your amplifier All part numbers shown are Stewart Audio Part Numbers Mounting Brackets AV POLE Pole mount bracket for AV Series amplifiers AV BRACKET Connection Adapters ADPT RCA Mono Female RCA to male Euroblock ADPT SUMRCA_ Stereo Female RCA to male Euroblock ADPT SUM35 Stereo Female 3 5mm to male Euroblock Wall Plates WP RVC B Wallplate with 10k potentiometer and knob for re mote volume control Black WP RVC A Wallplate with 10k potentiometer and knob for re To purchase these accessories or to see the full 26 mote volume control Aluminum Stewart Audio product lineup visit us at www stewartaudio com Universal mounting bracket for AV Series amplifiers 8 Notes For Your Record
14. he High setting by slid ing the switch to the right If the microphone is generally too quiet se lect the Low setting by sliding the switch left 3 2 3 Remote Volume Control CVA50 1 Priority PA amplifiers can have their volume remotely con trolled or muted via the Euro Block input on the rear of the amplifier The remote volume control allows the units volume to be controlled through the use of an external potentiometer which can be located wherever convenient for the user Remote muting is also useful for fire alarm situations in which all unnecessary sound must be silenced NOTE If the remote volume control connector is utilized it will override the volume knob on the rear of the unit In order to remotely control the volume of the unit a 10k ohm potenti ometer should be placed between the 10V pin and the GND Ground pin on the rear of the unit with its wiper on the RVC pin The volume will be determined by the selected resistance on the potentiometer the greater the resistance the louder the volume The amplifier can be remotely muted by making a connection between the GND pin and the MUTE pin No power should be applied to these pins simply a contact connection 10V 10kQ moO RVC GND MUTE 18 3 2 4 PA Ducking The CVA50 1 Priority PA includes a ducking feature which allows the PA channel to talk over the other channels When a 25V Signal is de tected on PA line it will lower the other channel
15. nder this warranty can be factory repaired at cost to the customer Use the con tact information below to initiate the repair process 6 2 Return Procedure This section includes the return procedures which must be followed in order to prevent processing delay or cost to the customer Please read the entire section before contacting Stewart Audio for returns 23 6 2 1 Return Authorization Number All returns to the factory for service must be accompanied by a Return Authorization RA number One can be obtained by contacting Stewart Audio at 209 588 8111 or via e mail at support stewartaudio com NOTE Any defective products received without an RA number will be returned to sender at their expense If Stewart Audio is unable to contact the sender in 14 days the mer chandise will be considered scrap and may be disposed of 6 2 2 Shipment Instructions If Stewart Audio requests that you ship the defective product back to their service center please refer to the guide below To ensure prompt warranty service be sure to follow all instructions 1 Return Authorization RA is required for product being sent to the factory for service 2 See packing instructions in section 6 2 3 3 Ship the defective product using a method which provides for or der tracking or order confirmation The service center is located at the following address Stewart Audio 14397 Cuesta Court Suite D1 Sonora CA 95370 4 Use a bold black marker
16. ont sna 1 38in 3 5cm Side 2 3 Proper Cooling Considerations Because CVA50 1 Priority PA amplifiers regulates their temperature using convection cooling and no fans the amplifiers must be given ade quate space to allow for proper airflow Do not stack the amplifiers on top of each other or mount it in a way that other equipment will block airflow along the surfaces of the case CAUTION Inadequate airflow to the amplifier can cause the amplifier to overheat and potentially become damaged in the process Be sure to provide plenty of air space to allow for convection cooling 2 4 Input Connections Your CVA50 1 Priority PA amplifier is provided with a 3 pin Euro Block connector for its input connection This connector will accept both bal anced or unbalanced connections however some modifications must be made for an unbalanced connection See the next two sections for instructions on connecting your amplifier to its input source 2 4 1 Balanced Input Connections When using a balanced input source and connector you must ensure that the hot cold and ground pins of the connector are matched up to the and ground pins of the CVA50 1 Priority PA Euro Block con nector respectively Diagrams have been provided for standard XLR and TRS connectors Please refer to the manual of your input source in case it does not follow the standard pin out Input Connector 4 Input Connector 4 Male TRS
17. s by a set amount Both the sound threshold to activate the ducking Ducking Sensitivity and the amount the other channels are lowered Ducking are configu rable via recessed knobs on the front panel 4 Troubleshooting Problem Power indicator does not turn on Procedure Check that the amplifier is plugged into a live outlet After you have ensured that it is not a power issue disconnect any speakers If the amplifier turns on after a few seconds delay then the problem is in the output connection Check wiring and speakers for short circuits Problem No output on one or both channels Power indicator is lit Procedure Check that level controls are not turned down Check that input and output connections are secure Refer to section 2 5 to en sure that you have properly connected your speakers Ensure signal present LED is flashing to denote a signal If there is no signal detected check signal source and that level controls are set high enough Problem Microphone level is too low even after adjusting level knob Procedure Refer to section 3 2 2 to adjust the gain switch on the rear of the amplifier Problem Channels 2 4 cut out while speaking into the microphone Procedure This is part of an intended feature calling ducking Refer to section 3 2 4 to adjust this to a more acceptable level Problem Amplifier overheats and or shuts off Procedure Review section 2 3 on proper cooling procedures Check the signal lights on th
18. so violate local regulations 3 Use care when making connections between the amplifier and the input or output equipment Using equipment that is not capable of handling the output wattage may lead to permanent damage damage to your CVA50 1 Priority PA amplifier or connect ed equipment if the instructions in this manual are not followed NOTE Stewart Audio will not be held responsible for A NOTE For additional operating precautions please refer to Important Safety Instructions located on Page 2 3 2 Controls Indicators and Connectors LVASU 1 PA CUP SIG PWR 21345 Speaker Out Connector Power Connector Clip indicator LED Signal Present Indicator LED Power Indicator LED 6 Remote Volume Control RCA Input 1 16 STEWART LOCAL LEVEL PA LEVEL A DUCKING 25VIN MIC LINEIN LOW HI 12 6 3 5mm Input 2 9 Ducking Sensitivity Knob D Local Input Level Knob 25V Paging Input 12 Mic Line Input Paging Input Level Knob Mic Gain Hi Low Switch 3 2 1 Indicators The CVA50 1 Priority PA amplifiers have three rear panel LEDs to indi cate the status of the amplifier The blue LED labeled ON will be lit when the unit is not in sleep mode The green LED labeled SIG will light when an audio signal is present on the audio input When the unit is operating with both green and blue LEDs lit and the audio input sig nal goes away or is removed the green SIG LED
19. t unused for a long period of time the power cord should be unplugged from the outlet Damaged Amplifiers requiring service should be repaired by a qualified service technician when The power cord or AC plug has been damaged Objects have fallen or liquid has spilled into the unit The amplifier has been exposed to rain or other moisture The amplifier does not appear to operate normally or exhibits a marked change in performance e The amplifier has been dropped or the enclosure damaged aon The user should not attempt to service the amplifier beyond that de scribed in the operating instructions All other servicing should be referred to qualified service personnel Table of Contents Important Safety INStrUCTIONS ee tee ttt ttt ttt tte teteeees 2 Table Of CONTENTS ecceeeer treet tte ette settee terete este ee ttee teres eeias 4 1 Welcome e eee cee i i inet eees 5 1 1 F AtUreS esetteeee teeter ttt ttt er tt tteee te ttiterttttaes 5 1 2 Using this Mantal crteecrrt teers t eter e tet ee te treeee tetas 5 PST 00 RESO 6 2 1 Setup PreCaUtiOns vivre eter te teeter rns 6 2 2 Amplifier Installation s cere ttteee rete seer tet eeeeeeeeees 6 2 2 1 Pole Mount Installation cceeeretettereeeeeeeeees 6 2 2 2 Universal Mount Installation srseerte ee 7 2 2 3 Product DIMENSIONS rire tt eee 8 2 3 Proper Cooling Considerations 1 tere etnies 8 2 4 Input CO
20. will go out and the unit will continue to operate with the blue LED on for approximately 5 minutes before going into sleep mode When signal is present and out put is going to the speakers the red LED labeled Clip will light when the input signal is too hot The LEVEL control must be adjusted until the CLIP LED goes out for undistorted sound amplification 3 2 2 Controls The CVA50 1 Priority PA controls are located on the rear of the unit There is no power switch so the amplifier will power up into a sleep state when power is first applied The CVA50 1 Priority PA Signal Sense Technology SST will power up the amplifier from sleep when a signal is detected After 5 minutes without an input signal the amplifier will go into sleep mode The rear panel contains two volume knobs The amplifier is set to run off of a line level source and the level should be adjusted for optinum performance To adjust this knob you will need a small flat head screwdriver While a typical program source level is present spin the rotary knob as far clockwise as you can without hearing distortion or without the Clip indicator illuminating If the signal is distorting and the knob is all the way counter clockwise adjust the gain down at the source level The Mic Gain setting will adjust for the sensitivity of the microphone by different manufactures beyond what the volume control offers If the microphone is generally too loud select t
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