- world 600 1.2 manual.pub
Contents
1. terminals To simplify hookup a dual banana plug may be used across the positive output terminals to make speaker connections in bridged mode Important follow these speaker hookup instructions carefully Failure to do so could damage your amplifier Channel 1 Positive Terminal Speaker Positive Channel 2 Positive Terminal Speaker Negative Channel 1 Negative Terminal no connection Channel 2 Negative Terminal no connection 15 Wiring Inputs in Parallel Wiring XLR and 1 4 inputs in parallel as throughputs to other equipment requires special consideration when combining balanced and unbalanced lines Connecting an unbalanced lines described above to any input will render all inputs on that channel unbalanced If it is necessary to combine balanced and unbalanced connections on the same channel the unbalanced connector must not ground the Negative input In the case of the 1 4 phone input this means using the TRS stereo 1 4 phone plug and leaving the sleeve terminal unconnected When using the XLR connector s pin 3 must be left unconnected not tied to ground as described above Output Wiring Outputs are available via both 5 Way Binding Posts and heavy duty 1 4 Phone Jacks The Binding Posts will accept bare wire of up to 6 AWG spade lugs hook lugs and a single or dual banana plugs When wiring speakers in stereo red binding post is connected to the speaker s p2. cm 14 8 in 37 6 cm 10 lbs 4 5kg 11 lbs 5kg 18 Contents TntrOduictt oM ee i eee ies Bee eG Ls 2 Contents For the Record ccccc cece enna 3 SATCU Saxena aes oe eae ce oe eee 4 amp 5 Special Features 5c siscns seckswacesse saarenseneacts 6 8 Front Panel Features ccc ccc cece eee enenees 9 Rear Panel Features 0 00 cece cece een ee ee eens 10 Installation ccc cece cece cece cece eeeeanes 11 15 Trouble Shooting weds ersduavahobscerewayiees yang 16 17 Technical Information cece cece eee eee 18 For The Record Please fill out and return the enclosed warranty card at your convenience This information will provide proof of ownership for warranty purposes and will allow us to notify you if necessary 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 Safety Before using your Stewart Audio Inc Power Amplifier please read this Owner s Manual carefully to ensure optimum trouble free performance WARNING TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT EXPOSE 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 AN CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE
3. 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 uninsulated J dangerous voltage within the product s enclosure that may be of sufficient magnitude 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 All of the safety and operating instructions should be read before the amplifier is operated Retain these instructions for future reference All instructions should be followed all warnings on the amplifier and in the operating instructions should be adhered to 2 This amplifier should not be used near water for example near a bathtub in a wet basement near a swimming pool etc 3 The amplifier should be situated so that it s 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 Troubleshooting Reference Chart Symptom No output Power indicator L
4. ED is off Note there is a normal delay of up To 1 minute when amp is first plugged in or circuit breaker is reset Recommended Action Be sure power outlet is live Be sure power switches are on Check circuit breaker Wait 1 minute after plugging in cord or resetting breaker No output Power indicator LED Cycles on and off This indicates a short circuit Condition on the output Disconnect speaker wires and turn amplifier power switch on If amp stays on the problem is in the output wiring or speakers Power indicator on no output from one or both channels Check input level controls input and Output cables input signal and speakers If operating in bridged mode be sure connections are made to Channel 1 s inputs Low volume in one or both channels Check input level controls input signal levels and input wiring Be sure both speakers are the same impedance Amplifier overheats and or shuts off Review section on Thermal Considerations Note that overdriving amplifier for a long period can cause thermal shutdown Note that overdriving amplifier hard enough can cause momentary shutdown Distorted output Check signal level and signal source Check speaker s Noise on output Check signal source for noise If you are running input cables of more than 30 feet balanced lines can reduce noise levels considerably See sections on Input and Output wiring for more infor
5. High Speed Switching Power Supply Technology Since 1982 STEWARTAUBIO The Difference is Hear Stewart Audio 14397 Cuesta Court Suite D1 Sonora CA 95370 Phone 209 588 8111 Fax 209 588 8113 support stewartaudio com We solicit your comments and suggestions World Series 600 amp 1 2 Professional Power Amplifiers Owners Manual stewartaudio com Congratulations You have purchased a powerful product which will provide you with many years of reliable service Since 1982 Stewart committed to innovation in design and quality workmanship has provided its customers with a unique combination of performance and reliability This philosophy has attracted the attention a gained the respect of industry professionals around the world The World 600 Professional Power Amplifier delivers more than 230 watts per channel in stereo mode and over 500 watts when bridged for mono operation This remarkable performance comes in a package weighing only 10 pounds while occupying just one standard rack space Thermal concerns are minimized in the World 600 by innovative circuitry and extraordinary efficiency making installation simpler than ever before The World 1 2 Professional Power Amplifier delivers more than 420 watts per channel in stereo mode and over 1000 watts when bridged for mono operation This remarkable performance comes in a package weighing only 11 pounds while occupying just one standard rack space Thermal concer
6. ability and improved performance Mono Bridgeable The two channels of the World 600 World 1 2 can be bridged together to form a single channel In this configuration the load impedance is effectively divided between the two channels so that each channel sees half the impedance of the load This results in at least three times the power output of either single channel at the same impedance Bridged Operation Operating your amplifier in Bridged or MONO mode allows the two channels to be used together to drive a single monaural load at a much greater power level than is achievable using a single channel Special wiring requirements must be observed when operating in bridge mode Failure to install input and output wiring as specified here risks damage to the amplifier and other system components and could void the amplifier s warranty Before converting to bridged mode be sure to turn off the amplifier s power switch or disconnect the AC power Never convert from one operating mode to the other while amplifier is on Set the Mono Stereo switch to MONO position The switch is located on the rear panel near Channel 2 s input section Make the appropriate input connection to channel 1 input only when the Mono Stereo Switch us in the Mono position the Channel 2 Input is disengaged Connect the positive terminal of the loudspeaker 4 ohm minimum to the positive red terminal of Channel 1 Make no connections to the Ground
7. e full clockwise maximum level Rear Panel XLR Inputs Each channel has a female XLR balanced input connector which may also be used with unbalanced lines See Input Wiring in the section on Installation page 12 for more details Note the XLR input is wired in parallel with the standard 1 4 phone jack so that either may be used as a through connection to feed additional amplifiers or other equipment 1 4 TRS Phone Inputs Each channel has a standard female 1 4 phone input connector which may be used to either balanced or unbalanced lines the input automatically adapts to either type of input signal See Input Wiring in the section on Installation page 12 for more details Circuit Breaker A circuit breaker is provided at the rear of the amplifier To reset simply push the button back to it s normal position Note that the re initialization of the World 600 World 1 2 s Power Supply will cause a delay up to one minute after the circuit breaker is reset 5 Way Binding Post Output Connectors Each channel incorporates a pair of heavy duty 5 Way Binding Post output connectors They will accept bare wire spade lugs hook lugs and single or dual banana plugs Additionally the binding posts are situated so that when the amplifier is configured for bridged operation one dual banana plug may be inserted across the terminals See Output Wiring in the section on Installation page 14 for more details 1 4 P
8. ected to AC power 16 Do not place the amplifier near heat sources such as radiators heat registers stoves or other appliances that product heat The amplifier should be only be connected to 120 VAC 60 Hz power supply 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 the point where they exit the amplifier 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 abrasive cleaners Never pour any liquid on the amplifier When left unused for a long period of time the power cord should be unplugged form the outlet Damaged Amplifiers requiring service The amplifier should be serviced 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 ao oP 10 The user should not attempt to service the amplifier beyond that described in the operating instructions All other servicing should be referred to qualified service personnel Special Feature
9. ent temperature the amount of heat generated by other equipment in the rack the properties of the rack enclosure being used and how hard the amplifier is working For example a World 600 World 1 2 being used by a guitar player in a loud rock band will generate more heat than the same amplifier driving nearfield monitors at low volume Depending on the installation it may be necessary to guarantee airflow around the heatsinks by rearranging system components or installing a cooling fan in the rack In a free standing installation in which the unit is sitting on a shelf or hard floors the rubber feet must be mounted to the bottom of the amplifier Under no circumstances should the amplifier be placed directly on carpeting of a similar surface AC Power Considerations Your Stewart amplifier is designed to operate on 120 volt 60Hz alternating current Power consumption will depend on load impedance signal level and dynamic properties of the program material At 8 per channel power draw averages approximately 100 and 225 watts The World 600 World 1 2 is equipped with unique inrush current limiting circuitry which minimizes power drawn from the wall to 8 Amps of less on power up Multiple amplifiers may all be switched on at once without the need for staggered turn on configurations Input Wiring The world 600 World 1 2 s sections allow the use of XLR or 1 4 phone connectors and will accept either balanced or unbalanced input sig
10. hone Output Connectors Each channel also utilizes a single heavy duty 1 4 output connector This connector is wired in parallel with 5 Way Binding Posts which facilitates running multiple loads from the same amplifier channel where needed See Output Wiring in the section on Installation page 14 for more details 10 Mono Stereo Switch The switch is used to Bridge the amplifier for mono operation Maximum rated power of the World 600 is 600 watts into 4 ohms and the World 1 2 is 1200 watts into 4 ohms IMPORTANT Never change the position of this switch while Amplifier is turned on Doing so could damage your equipment Note Amplifiers operating in bridge mode require different connections than amplifiers operating in stereo See Bridged Operation in the section on Installation page 14 for more details Installation Mechanical Consideration The Stewart Audio World 600 World 1 2 occupies one standard rack space and is only 15 deep and weighs just 10 and 11 pounds respectively making it easier to install and transport than almost any other comparable amplifier Still some sensible precautions are in order Always use four screws to affix the amplifier to the rack preferably using flat washers as well to avoid cosmetic damage to the front panel When rack mounting your amplifier it may be necessary to remove the four rubber feet from the bottom of the unit in freestanding installations the rubber feet must be instal
11. led In mobile rack mounted installations it is recommended that the rear of the amplifier be stabilized for additional support Thermal Considerations Cooling of the World 600 World 1 2 is achieved convection through heatsinks mounted on each side of the amplifier In the event that the chassis temperature reaches 87 degrees C an internal thermostat will open turning off the power supply until the amplifier cools down Although the World 600 World 1 2 s sophisticated thermal management system makes it less susceptible to overheating than other amplifiers it remains necessary to provide airspace around the chassis This may mean leaving a rack space 11
12. mation on wiring balanced lines 17 Troubleshooting If you experience difficulty in operating your World 600 World 1 2 chances are good that you will be able to remedy the problem yourself using standard troubleshooting techniques and suggestions offered in the table on the following page If you wire your own cable it is imperative that all connections be made cleanly with no stray wire strands to short terminals Keep in mind that other components in the system can cause problems which may appear to be caused by the amplifier systematic troubleshooting will allow you to isolate the source difficulty If you fail to correct the problem by following the steps outlined below do not attempt to open or repair the unit yourself Please contact Stewart Audio at 209 588 8111 to obtain a Return Authorization RA Number and shipping instructions Once RA Number is obtained return the unit to Stewart Audio 14407 Cuesta Court Sonora CA 95370 Do not return any amplifier to Stewart without first obtaining an RA Number Refer to the enclosed Warranty Information for Terms and Conditions of Warranty NOTE Upon installation of the World 600 World 1 2 there will be a turn on delay of up to one minute after AC power is applied to the amplifier This is a result of the initialization sequence preformed by the amplifier s High Frequency Switch Mode Power Supply Subsequent delays will be minimal as long as the World 600 World 1 2 remains conn
13. me explanation is in order Conventional supplies operating at 60Hz standard line frequency recharge only 120 times per second requiring their storage capacitors and transformer to be quite large to supply the energy needed during the intervals between cycles when power is not available from the wall The power supply must act as a local reservoir of power from which the amplifier circuits draw This storage function is responsible for much of the bulk weight and cost of traditional power amplifiers The Stewart High Frequency Switch Mode Power Supply fully recharges 120 000 times per second 1000 times faster than conventional supplies requiring far less capacitance for filtering and storage This high speed recharging reduces power supply sagging common with other designs In a Stewart amplifier it is almost as though power is fed directly from 7 The wall to the speaker with the amplifier acting only as a valve in between to control its flow This power supply s remarkable efficiency at converting energy from the AC line to a usable form for loudspeaker applications allows many of the major components to be downsized saving space weight and cost Unlimited Dynamic Range Most power amplifiers utilize some form of current limiting in the audio signal path While a fairly reliable form of protection this technique has some disadvantages in that it can reduce the impact of musical transients by prematurely limiting ou
14. nals Each channel s XLR and 1 4 jacks are wired in parallel which allows throughput of the signal to additional amplifiers of other equipment such 12 Front Panel Sophisticated simplicity is a design objective in the development of all Stewart Audio amplifiers These amplifiers remain simple and intuitive to operate even while incorporating some of the most advanced technology available today Power On and Power Level Indicators The front panel provides visual feed back of the amplifier s status via several LED indicators The power switch is accompanied by a red LED which illuminates upon plug in Note Upon installation of the World 600 World 1 2 there will be a turn on delay of up to one minute after AC power is applied to the amplifier This is a result of the initialization sequence performed by the amplifier s High Frequency Switch Mode Power Supply Subsequent delays will be minimal as long as the World 600 World 1 2 remains connected to AC power Each channel features two additional LEDs which indicate the level of the power being produced Green indicates a signal of 20dB while Red indicates that the amplifier is being pushed into clipping These level indicators are accurate at any load impedance Level Controls A detented multiple position input level control has been provided for each channel These controls are easily accessible on the front panel of the amplifier They operate in conventional fashion i
15. nouts are standard see diagram below Pin 2 of the XLR and the Tip of the 1 4 phone connectors are Hot or Positive Input connections should always be made with the amplifier s power turned off Balanced XLR Connections are made with the following pin assignments 1 Ground a n 2 Positive 3 Negative n Unbalanced XLR Connections are made with the following pin assignments 1 Ground n 2 Positive 3 Ground n wire pins 1 amp 3 together Balanced TRS 14 Phone Connections are made with the following pin assignments Ring Tip Positive se sion Ring Negative Sleeve Ground Gi Pi _ a p Unbalanced TS Phone Connections are made with the following pin assignments Tiare f Slane Tip Positive Sleeve Ground YC f Tip Tip 13 Open above and below the amplifier Multiple amplifiers can be racked on top of one another leaving partial space between them so sufficient airflow is maintained to allow heat to escape If mounted in a sealed rack leave top and bottom spaces open to create a chimney effect within the rack which will provide cooling as air is drawn in the bottom and the top In any case be sure that the sides of the rack next to the amplifier are clear of cables power strips etc so that airflow is maintained around the heatsink fins The amount of airflow is necessary will be determined by a number of factors including ambi
16. ns are minimized in the World 1 2 by innovative circuitry and extraordinary efficiency making installation simpler than ever before We at Stewart Audio strive to bring you the finest in professional electronics and we thank you for your choice which we see as appreciation for our efforts e e Specifications Output Power 1kHz 0 1 THD FTC Power Rating lt 01 THD 20Hz 20kHz both channels driven Rated Power Output Mono 1kHz Frequency Response 0dB 0 5dB Bandwidth 0dB 3 0dB Signal to Noise A Weighted 650W 4 Input Impedance Input Sensitivity 200Wx2 8 Slew Rate Damping Factor Input Connectors Output Connectors Voltage Gain Power Requirements Power Supply Design Dimensions Height Width Depth behind front panel 14 8 in 37 6 cm Weight World 600 World 1 2 275Wx2 2 perchannel 500Wx2 2 per channel 190Wx2 4 perchannel 350Wx2 4 per channel 110Wx2 8 perchannel 200Wx2 8 per channel 500Wx1 4 bridged 350Wx1 8 bridged 1000Wx1 4 bridged 700Wx1 8 bridged 20Hz 20kHz 20Hz 20kHz 15Hz 45kHz 15Hz 45kHz gt 100dB gt 100dB 20K 20K 1V OdBV 1V OdBV lt 30V microsecond lt 30V microsecond lt 500 lt 500 3 pin XLR 1 4 TRS 6 Gauge 5 Way Binding Post 1 4 TRS 40x 32dB 48 3x 38 7dB 120C AC 3 5A 120C AC 6A High Speed Switching High Speed Switching 1 75 in 4 5cm 19 in 48 3 cm 15 3 in 38 9 cm 1 75 in 4 5cm 19 in 48 3 cm 15 3 in 38 9
17. ositive terminal black is ground The 1 4 phone jacks are wired using the following assignments Tip Positive Sleeve Ground f Sleeve yen Ma Tip Te Each channel s 1 4 Phone and Binding Post output connectors are wired in parallel 14 Balanced Unbalanced Inputs The World 600 World 1 2 incorporates XLR and 1 4 Phone input Connectors wired in parallel This allows throughput of the signal to additional amplifiers or other equipment such as DAT recorders etc 6 Gauge 5 Way Binding Post and 1 4 Outputs The World 600 World 1 2 binding Posts output connectors will accept banana plugs spade lugs or bare wire up to AWG In addition the Binding Posts are positioned to allow one standard banana plug to be used when operating the amplifier in bridged mode 1 4 Phone output connectors are also provided wired in parallel with the Binding Posts In Rush Current Limiting A breakthrough from Stewart the World 600 World 1 2 unique inrush current limiting circuitry minimizes power drawn from the wall to 8 AMPS or less on plug in Staggered turn on configurations for multiple amplifier setups are now a thing of the past as multiple amplifiers may be switch on simultaneously High Frequency Switch Mode Power Supply The World 600 World 1 2 features a radical departure from conventional power supply design Stewart s High Frequency Switch Mode Power Supply Because of this pioneering use of advanced technology so
18. s The World 600 and World 1 2 are the result of many years of experience in the research development and manufacturing of amplifiers and other sound equipment It is a combination of old and new cutting edge electronics and timeless purity of sound As such it represents Stewart Audio s commitment to developing the latest available technology to achieve the absolute audio quality and reliability Please take a few minutes to read through this section of the manual which provides an overview of the features that make these amplifiers unique Low Impedance High Current Design The design of the World 600 World 1 2 are exceedingly conservative with regard to current capabilities This ensures that the amplifier s output devices remain within their Safe Operating Area even under extreme conditions As a result the World 600 World 1 2 runs low impedance loads safely while retaining the high impact dynamics for which they were designed Auto Impedance Optimization The High Frequency Switch Mode Power Supply and amplifier design used in the World 600 World 1 2 adapts to the demands placed upon the amplifier enabling them to run with maximum efficiency regardless of the load impedance Thermal management problems normally associated with amplifiers of this capacity are therefore greatly reduced Resources otherwise applied toward dealing with thermal problems can be put to better use in higher quality active components for increased reli
19. tput current and therefore dynamics Low frequency signals may sound weak or distorted as a result Stewart Audio amplifiers have no current limiting in the audio path and therefore reproduce the full dynamics of the audio signal Absolute Protection Stewart Audio power amplifiers employ circuits which fully protect the amplifier while avoiding sonic compromise For example a unique circuit monitors the current drawn from the power supply The amplifier s output is not affected in any way until the load impedance drops below 2 indicating the presence of a short Under these conditions the power supply will simply shut down until the short is removed at which point the supply will slowly ramp up to full power protecting the load from a surge of high energy In the event of an amplifier malfunction this circuitry will also protect the speakers since the power is immediately disconnected from the amplifier Most other amplifier designs require the presence of relatively high levels of signal in order to detect a short circuit on the output At low levels these amplifiers will continue to drive a short causing rapid heat buildup thermal runaway and finally amplifier failure The current sensing circuitry in all Stewart World Series amplifiers is capable of detecting a shorted output even at low program levels increasing reliability under conditions which could cause other amplifiers to fail As direct boxes tape recorders etc Pi
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