AV50-2 - Manual
Contents
1. 13 3 2 1 Indicators The AV50 has 3 front panel LED indicators The first is the power indi cator which will illuminate when power is supplied to the amplifier The next 2 LED indicators are the Clip indicators one for each channel These lights will indicate that the input signal is too hot and will sound distorted when amplified To fix this the gain should be reduced at the preamp or mixer level 3 2 2 Controls The AV 50 s front panel has only one control a push button to control the power of the unit When the push button is depressed the power is on When the button is push button is out the power is off The rear panel contains two input sensitivity knobs as well as a mode switch The amplifier is set to run off of a line level source and the sen sitivity should be adjusted for optimum performance To adjust this knob you will need a small flat head screwdriver While a typical pro gram source level is present spin the rotary knob as far clockwise as you can without hearing distortion or without the Clip indicator illumi nating If the signal is distorting and the knob is all the way counter clockwise adjust the gain down at the source level The mode switch on the rear of the amplifier should only be adjusted during the primary installation It switches the amplifier between the three output modes Stereo Mono and Bridge Mono Refer to section 2 6 of this manual for more information 14 4 Tr2. 9 When left unused for a long period of time the power cord should be unplugged form the outlet 10 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 aooo 11 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 serene reteset seeneseereeenerseereeens 1 Table of Contents s 11 1 ssssseseseseressssessserseeeserernneresinsnsnseseseneneneneseseees 3 1 WEelCOMe ec tee it cin antegrade ar petnen torte eiaetnoae 4 DAF Ai PE Sheireen inaina adaska ataa tid carne 4 1 2 Using this Manual reeeeeererererererererererererrererererererereneeeerrrneeres 4 7 11 Dc tet 5 2 1 Setup PRECAUTGNS extonntinstedeltsrnentiaestadinidnstndeltnnsnctigseteitinsts 5 2 2 Amplifier Installation s sreessesrerseesenetenserseeseertensens eres 5 2 2 1 Pole Mount linstallationi seuseeeessecscensecrcenensis 5 2 2 2 Rack Mount Installation seere erreten 6 2 2 3 Product DIMENSIONS eeereeeeeererererrrererrr
3. 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 under 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 17 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 instru
4. 180W x 1 8 Ohm bridged 80W x 2 Constant Voltage 70 7V rms out AV Series AV50 50W 4 Ohms 25W 8 Ohms 100W 8 Ohms bridged 1U 2U Products World Series Contractor Series World 600 190W x 2 4 Ohms CVA7400 200W x 2 Constant Voltage 110W x 2 8 Ohms 70 7V rms out World 1 2 350W x 2 4 Ohms CVA7800 400W x 2 Constant Voltage 200W x 2 8 Ohms 70 7V rms out World 1 6 550W x 2 4 Ohms World 600R Recessed controls 300W x 2 8 Ohms World 2 1 World 1 2R Recessed controls 650W x 2 4 Ohms 400W x 2 8 Ohms Custom Amps Contact factory For more information contact sales stewartaudio com
5. RT Part Number RMK 50 S 2 2 3 Product Dimensions k 8 5in gt 21 6cm AV Series AV 50 2 STEWART 1 7in nae 4 4cm Clip Power e1 7 0in 17 8cm 3 0 1 7in Side View 4 4cm 2 3 Proper Cooling Considerations Because the AV 50 regulates its temperature using convection cooling and no fans the amplifier must be given adequate 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 through 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 The AV 50 allows for two different type of unbalanced input connec tions RCA and 3 5mm TRS to be used for the input signal However only one input type may be used at a time RCA or phono connections allow for mono inputs to be connected to each of the two channels These inputs are unbalanced and should be wired as shown in the following diagram Ground Shield e Ground o o Shield A single 3 5mm TRS stereo connector will allow for two unbalanced signals to be sent to the amplifier using only one cable The tip of the connector the left channel will be sent to Channel 1 The ring of the connector the right channel will be sent to Channel 2 Please refer to the fo
6. STEWARTAUDIO The Difference is Hear AV Series AV 50 2 i VAAN DE AV 50 Owner s Manual February 2010 www stewartaudio com Important Safety Instructions Before using your Stewart Audio Inc Power Amplifier please read this Owner s Manual carefully to ensure optimum trouble free perform ance 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 2 All of the safety and operating instructi
7. ctions 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 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 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 I
8. f you do not have the origi nal box see number 4 4 If you provide your own shipping pack the minimum recom mended 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 sealing tape c Do not use light boxes or peanuts NOTE Damage caused by poor packaging will not be covered under warranty 6 2 4 Estimate Approval An estimate for all non warranty repairs will be provided to the cus tomer once the unit has been shipped to the factory The customer is responsible to approve this estimate within 7 days If the repairs are not approved within 14 days Stewart Audio reserves the right to con sider 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 19 Stewart Audio Product Line AV 25 2 Sub Compact Products 35W x 2 4 Ohms CVA 25 1 25W x1 25V 70V 25W x 2 8 Ohms CVA 50 1 50W x1 25V 70V Half Rack Products PA50B 50W x 2 4 Ohms 25W x 2 8 Ohms 100W x 1 8 Ohms bridged Compact Series PA Series DA70 2 70W x 2 4 Ohms 35W x 2 8 Ohms DA70 4 70W x 4 4 Ohms PA100B 90W x 2 4 Ohms 35W x 4 8 Ohms 50W x 2 8 Ohms DA770 2
9. is amplifier proudly designed and manufactured in the USA 1 Welcome c2 55 STEWARTAUDIO The Difference is Hear Congratulations on the purchase of your new Stewart Audio AV Series power amplifier This amplifier has been designed and built to provide you with years of high quality audio performance and trouble free op eration If after reading this manual you should have any questions con cerning amplifier installation and operation please contact your Author ized 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 AV Series amplifier is the result of years of experi ence 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 Switching Power Supply for efficiency size reduction depend ability e Superior Thermal Protection effective protection with no noisy fan and no untimely shutdowns e Full Complimentary Class A B Amplifier utilizes integrated Dar lington Pairs e High Dissipation Output Devices insures operation well within their S O A Safe Operating Area for effortless operation and device longevity 1 2 Using this Manual In order to obtain maximum performance from your AV Series Ampli fier please take time to read this brief owner s manual and carefully follow the guidelines for con
10. llowing diagram for wiring instructions Ch 1 Ch 2 wa Ground Shield k chi V ch2 __ Ground Shield 2 5 Output Connections Stewart Audio recommends using high quality heavy gauge speaker wire and connectors to send the output signal of your amplifier to the speakers Use the following table as a guideline when selecting your wire gauge Distance Wire Gauge Up to 25 ft 16 AWG 26 40 ft 14 AWG 41 60 ft 12 AWG Over 60 ft 10 AWG Speaker leads connect by means of Phoenix type block connectors supplied with the unit Strip speaker leads 1 4 and insert into connec tor observing proper polarity With a small flat blade screwdriver tighten the screw until the leads are held securely in place Inspect for possible shorts or broken wires 2 6 Wiring Configurations 2 6 1 Dual Mode Your Stewart AV Series amplifier is factory configured to work as a dual mode stereo amplifier This allows the amplifier to power two speak ers with independent source inputs and gains Input Connections If using RCA phono input connectors connect them to the Channel 1 and Channel 2 inputs on the rear of the amplifier If using the 3 5mm TRS connec tor connect it to the appropriate socket Do not connect a signal to both inputs as this could cause damage to your amplifier Output Connections Prepare the speaker leads as described in section 2 5 The speaker leads should be attached to
11. nection and operation This manual provides you with the information necessary to safely in stall and operate your new AV Series 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 di rectly using the contact information provided on the back of this man ual 2 Setup 2 1 Setup Precautions CAUTION Before installing your amplifier make sure that you have read the Important Safety Precautions at the be ginning of this manual 2 2 Amplifier Installation 2 2 1 Pole Mount Installation The AV 50 amplifier is the first amplifier in the Stewart Audio family of amplifiers to have the option of pole mounting This provides a secure and convenient way to provide quality sound reinforcement for other pole mounted equipment including video projectors Using the optional pole mount kit Part Number AV Pole secure the amplifier as shown in the following diagrams CAUTION Use only the screws provided in mounting brackets to the amplifier Do not overtighten STEWART Part Number AV Pole 2 2 2 Rack Mount Installation The AV 50 may also be rack mounted in a standard 19 48 3cm equip ment rack using the optional rack mount kit Part Number RMK 50 S The amplifier takes up 1U 1 75 of vertical space CAUTION Use only the screws provided in mounting brackets to the amplifier Do not overtighten STEWA
12. of Channels Input Connectors Output Connectors Power Requirements 80 channel Power Supply Design Dimensions Height Width Depth Weight 25W 80 per channel 50W 40 per channel 100W 80 30Hz 20kHz 10Hz 50kHz gt 100dB lt 0 1 10kO 1V gt 30V ms gt 200 80 2 RCA 3 5mm TRS Phoenix Block 120V AC 100W High speed Switching 1 7in 4 4cm 8 5in 21 6cm 7 0in 17 8cm 2 8lbs 1 6kg Stewart Audio reserves the rate to change features and specifications without notice 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 pur chaser 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
13. ons should 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 3 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 through the ventilation openings should be unobstructed 4 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 5 Do not place the amplifier near heat sources such as radiators heat regis ters stoves or other appliances that produce heat 6 The amplifier should only be connected to 120 VAC 60 Hz power supply Do not defeat the ground or polarization of the power plug 7 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 ampli fier To prevent risk of fire or injury damaged cords and cables should be replaced immediately 8 Clean the amplifier with a clean damp cloth Do not use solvents or abra sive cleaners Never pour any liquid on the amplifier
14. oubleshooting Problem Power indicator does not turn on Procedure Check that the amplifier is plugged into a live outlet and that the power switch is in the down position 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 Check that the mode switch Stereo Mono Bridge is in the correct mode 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 If after reading this troubleshooting section you are unable to restore proper function return it to your Authorized Dealer for service Refer to section 6 for instructions 15 5 Technical Specifications Maximum Output 20Hz 20kHz Stereo Bridged Mono Frequency Response 0 5dB 1W Bandwidth 3 0dB Noise A weighted any mode THD 80 20Hz 20kHz Input Impedance Input Sensitivity for Rated Output 80 Slew Rate Stereo Mode Damping Factor Number
15. ridge Mono mode 11 Bridge Mono Wiring Setup Input Stage Note Only the right channel tip will be used Channel 2 eo q N Channel 1 NOT USED Stereo In Output Stage Phoenix Style Connector Rear of AV50 l DO NOT USE 3 Operation 3 1 Operating Precautions 1 Before use your amplifier must be configure for proper operation including input and output wiring hookup Improper wiring can re sult 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 also 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 NOTE Stewart Audio will not be held responsible for dam age to your AV 50 or connected equipment if the instruc tions in this manual are not followed Controls Indicators and Connectors Front View AV Series on fa STEWART 3 Clip Power Clip indicator light Power on off switch 3 Power indicator light Rear View LEVEL Q 2 1 120VAC 60Hz 6 Mineo T BRIDGE MONO STEREO 2 SPKR 1 6 Power cable socket IEC C13 Q RCA phono channel inputs O Channel volume knobs O Stereo 3 5mm input O Speaker mode switch O Speaker outputs Phoenix tYpe connector
16. rrerreeeerrererere 6 2 3 Proper Cooling Considerations errs reer eestensees 7 2 4 Input CONNECTIONS e reece ett e teeter ett e teeta ae ee ete aeees 7 2 5 Output CONNECHONS ttenstaietprsenttancententinnshicstirsenisanntsicivansns 8 2 6 Wiring Configurations eereeeereeerererrrererererererererrrerreeeeererereres 8 2 6 1 Dual Mode Operation eeeeeeeeeerererereerrrte 8 2 6 2 Single Mode Operation ee eteeeteere eerren 10 2 6 3 Bridge Mono Operation eseese 11 3 Operation oeeeeeeeeeeeeeerettnniettittirietererererrttttininte 13 3 1 Operation Precautions eerste eter reteeeeterines 13 3 2 Controls Indicators and CONNECHOTS seeen eee 13 3 2 1 ae er 10 6 cc 14 3 2 2 O70 0100 seeeeeeeererereeetrtrerrtrtrtrrreteterrenererererrtereteeereeee 14 4 Troubleshooting ccc eee eee ae es 15 5 Technical Specifications ete 16 6 Warranty Information eerren 17 6 1 Warranty SUMMANY errr reteset seeteteeeteonereecnerreenesaes 17 6 1 1 Eligibility for Factory Repair eeeeeeeeeeereeeeeeee 17 6 2 Return Procedure seeeerrereereeerrrerrerrerrertrererererireererererenenrees 17 6 2 1 Return Authorization eeeeeeeeeeeeereerererererereereren 18 6 2 2 Packaging INStrUCHONS eee eeeeeeereererereerererereee 18 6 2 3 Shipping INStrUCTIONS eet eee te tet tee 18 6 2 4 Estimate Approval cccrettettcee seer tree eeeees 19 6 2 5 Payment of Non Warranty Repair eese 19 Fats tx Th
17. tage Phoenix Style Connector Rear of AV50 Channel 2 Channel 1 _ 2 6 3 Bridge Mono Operation Your Stewart AV Series amplifier has the option to run as a dual mode stereo channel amplifier as well as a more powerful single mono channel amplifier This mode is known as bridge mono and requires a different wiring setup than stereo or mono operation The difference between standard mono operation is that the amplifier will only be powering one speaker This allows for more wattage 100W 80 to be provided to a single output channel Input Connections The input signal in bridge mono mode should be connected to Channel 2 if using RCA inputs Do not connect any input to Channel 1 of the amplifier If using the 3 5mm stereo input the right ring channel s sig nal will be used Output Connections Prepare the speaker leads as described in section 2 5 The speaker leads should be attached to the positive terminals of both channels terminals 1 and 4 Nothing should be attached to speaker terminal 2 and 3 See diagram for further clarification Put Amplifier into Bridge Mono Mode Slide the rear panel switch marked Bridge Mono Stereo to the Bridge position Be sure the power button is off out then plug the line cord into a grounded AC outlet The amplifier is now ready for Bridge mode operation CAUTION To prevent loudspeaker damage ensure that the speaker is rated for the higher wattage output sup plied in B
18. the Phoenix block connector with regard to their polarity See diagram for further clarification 2 6 1 Dual Mode Operation cont Slide the rear panel switch marked Bridge Mono Stereo to the Stereo position Be sure the power button is off out then plug the line cord into a grounded AC outlet The amplifier is now ready for Dual mode operation Dual Mode Wiring Setup Input Stage R O Channel 1 q y Stereo In Channel 2 d ili Output Stage Phoenix Style Connector Rear of AV50 ia 1 3 5 E z Be nme 2 6 2 Single Mode Operation Your Stewart AV Series amplifier may also be configured for Mono Operation This allows the amplifier to power two speakers with inde pendent gain settings using only one input Input Connection The input signal should be connected to Channel 2 if using the RCA phono connectors Nothing should be connected to Channel 1 If us ing the 3 5mm stereo input the right ring channel s signal will be used Output Connections Prepare the speaker leads as described in section 2 5 The speaker leads should be attached to the Phoenix block connector with regard to their polarity See diagram for further clarification The amplifier is now ready for Single mode operation Single Mode Wiring Setup Input Stage Note Only the right channel tip will be used Channel 2 lt N Channel 1 e NOT USED Stereo In Output S
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