Rotel RB981 Power Supply User Manual
Contents
1. R a T E L STEREO POWER AMPLIFIER RB 981 Figure 2 Stereo Connections Inputs and Speakers French Translation German Translation Spanish Translation PREAMPLIFIER PR AMPLIFICATEUR VORVERST RKER PREAMPLIFICADOR PREAMP OUTPUTS ROTEL RB 981 WARNING T0 REDUCE THE RISK OF FIRE on JLECTRICAL SHOCK DO NOT EXPOSE TH EQUIPMENT TO RAIN OR MOISTURE SPEAKER STEREO 4 RO in nen BT POWER CONSUMPTION 400W AVIS riso ES SPEAKERS 4 en A UT 4 Figure 3 Bridged Mono Connections Inputs and Speakers French Translation German Translation Spanish Translation PREAMPLIFIER PREAMPLIFICATEUR VORVERST RKER PREAMPLIFICADOR y y PREAMP OUTPUTS ROTEL RB 981 WARNING TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE SPEAKER IMPEDANCE ROTEL STEREO 4 OHMS MINIMUM POWER AMPLIFIER MODEL NO RB 981 POWER CONSUMPTION 400W BRIDGED OHMS MINIMUM SPEAKERS JUMPER LOCATIONS FRENCH TRANSLATION GERMAN TRANSLATION SPANISH TRANSLATION Contents circled numbers refer to illustration About Rotel Getting Started A Few Precautions Placement AC Power and Cont2. RB 931 STEREO POWER AMPLIFIER AMPLIFICATEUR DE PUISSANCE STEREO STEREO ENDSTUFE ETAPA DE POTENCIA ESTEREOFONICA ROTEL power AMPLFIER RB 981 Owner s Manual Guide d utilisation Bedienungsanleitung Manual de Instrucciones CAUTION DO NOT OPEN CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL APPLICABLE FOR USA CANADA OR WHERE APPROVED FOR THE USAGE CAUTION TO PREVENT ELECTRIC SHOCK MATCH WIDE BLADE OF PLUG TO WIDE SLOT INSERT FULLY ATTENTION POUR EVITER LES CHOCS ELECTRIQUES INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU AU FOND This symbol is to alert the user to the presence of uninsulated dangerous voltages inside the product s enclosure that may constitute a risk of electric shock This symbol is to alert the user to important operating and maintenance service instructions in this manual and literature accompanying the product WARNING There are no user serviceable parts inside Refer all servicing to qualified service personnel WARNING To reduce the risk of fire or electrical shock do not expose the unit to moisture or water Do not allow foreign objects to get into the enclosure If the unit is exposed to moisture or a foreign object gets into the enclosure immedi
3. 2699 USA Phone 978 664 3820 Fax 978 664 4109 082 OMRB 981
4. 390 watts This fea ture allows you to increase the overall power output of your system by bridging the RB 981 and adding a second bridged RB 981 Or the RB 981 is bridged to drive a monophonic subwoofer Note however that when the RB 981 is bridged the speaker con nected to it must have an impedance of 8 ohms or more In order to use the RB 981 in bridged mode three jumper con nectors inside the amplifier must be moved from one set of pins to another This task should be done by a qualified technicain See your Rotel audio retailer In addition the RB 981 is connected to the other components in a different way When the RB 981 is setup for bridged operation the Bridged Mono indicator light on the front panel will light Resetting Jumpers Before opening the RB 981 cabinet to reset the jumpers the power cord must be unplugged from the wall DO NOTOPEN THE CABINET OF THE RB 981 BEFORE THE POWER CORD HAS BEEN UNPLUGGED FROM THE WALL FAILURE TO DO SO WILL EXPOSE YOU TO HAZARDOUS VOLTAGES After the power cord has been unplugged remove the screws that hold the cabinet cover in place and slide the cover off the amplifier Locate the three jumper pin blocks labeled S 601 S 602 and S 603 The factory standard stereo position of the jumpers is on pins 1 and 2 of each block There is a mark on the circuit board next to this position To convert the RB 981 to bridged mono move all three jumpers so they are on pins 2 and 3 of each
5. 0 5 3dB dB 4Hz 100kHz Frequenzgang 0 5 3dB dB 4 bis 100 000 Hz Damping Factor 20 20 000 Hz 8 ohms 1000 D mpfungfaktor 20 20 000 Hz 8 Ohm 1000 Speaker Impedance Normal mode 4 ohms nominal Lautsprecherimpedanz Normalbetrieb Minimum 4 Ohm Signal to Noise Ratio IHF A network 120 dB Ger uschspannungsabstand IHF A 120 dB Input Impedance Sensitivity 33 k Ohms 1 0 volt Eigangimpedanz empfindlichkeit 33 k Ohms 1 0 V Power Requirements 115 Volts 60 Hz or Spannungsversorgung 230 Volts 50 Hz 230 Volts 50 Hz Max Leistungsaufnahme 400 Watt Power Consumption 400 Watts Abmessungen B x H x T 440 x 121 x 305 mm Dimensions W x H x D 440 x 121 x 305 mm Nettogewicht 10 2 kg 173 8 x 43 4 x 12 Weight net 10 2 kg 22 4 Ib nderungen die dem technischen Fortschritt dienen bleiben vorbehalten All specifications are accurate at the time of printing Rotel reserves the right to make improvements without notice Fiche technique Caracter sticas T cnicas Puissance de sortie continue 20 Hz 20 kHz 0 03 8 ohms Distortion harmonique total 20 20k Hz 8 ohms 0 03 Distortion d intermodulation 60 Hz 7 kHz 4 1 0 03 96 Response en fr quence 40 5 3dB dB 4 Hz 100 kHz Facteur d amortissement 20 20 000 Hz 8 ohms 1000 130 watts par canal Imp dance mode normal 4 ohms minimum Rapport signal bruit IHF A network 120 dB 33 kohms 1 0 volt 115 Volts 60 Hz ou 230 Volts 50 Hz Consommation 400 Wat
6. ad this manual carefully In addition to basic installation and operating instructions it provides valuable information on various RB 981 system configurations as well as general informa tion that will help you get optimum performance from your system Please contact your authorized Rotel audio retailer for answers to any questions you might have In addition all of us at Rotel wel come your questions and comments Save the RB 981 shipping carton and all enclosed packing mate rial for future use Shipping or moving the RB 981 in anything other than the original packing material may result in severe dam age to your amplifier Fill out and send in the owner s registration card packed with the RB 981 Also be sure to keep the original sales receipt It is your best record of the date of purchase which you will need in the event warranty service is ever required Placement Because of its high power output the RB 981 may generate con siderable heat The heat sinks and ventilation openings in the am plifier are more than capable of dissipating this heat under normal conditions but don t smother your amplifier There must be ad equate clearance around the chassis The ventilation slots in the top cover must be unblocked and there must be reasonable air flow around the amplifier Use common sense when placing the amplifier in a cabinet or when stacking other equipment Likewise remember the weight of the amplifier when you select an i
7. ately disconnect the power cord from the wall Take the unit to a qualified service person for in spection and necessary repairs Read all the instructions before connecting or operating the unit Keep this manual so you can refer to these safety instructions Heed all warnings and safety information in these instructions and on the product itself Follow all operating instructions Clean the unit only with a dry cloth or a vacuum cleaner Keep the ventilation inlets on the unit unobstructed For example do not place the unit on a bed sofa rug or similar surface that could block the ventilation slots If the unit is placed in a bookcase or cabinet there must be sufficient clearance around the unit and ventilation of the cabinet to allow proper cooling Keep the unit away from radiators heat registers stoves or any other appliance that produces heat The unit must be connected to a power supply only of the type and voltage specified on the rear panel of the unit Connect the unit to the power outlet only with the supplied 2 pin polarized power supply cable or an exact equivalent Do not modify the supplied cable in any way Do not attempt to defeat grounding and or polarization provisions The cable should be connected to a 2 pin polarized wall outlet matching the wide blade of the plug to the wide slot of the receptacle Do not use extension cords Do not route the power cord where it will be crushed pinched bent at severe ang
8. ected re viewers in the industry who listen to music every day Their comments keep the company true to its goal the pursuit of equipment that is musical reliable and affordable All of us at Rotel thank you for buying this product and hope it will bring you many hours of enjoyment R a T E L STEREO POWER AMPLIFIER RB 981 Getting Started AC Power and Control Thank you for purchasing the Rotel RB 981 Stereo Power Ampli AC Power Input fier When used in a high quality music or home theater system your Rotel amplifier will provide years of musical enjoyment The RB 981 is a high power two channel power amplifier provid ing the highest level of audio performance Discrete output de vices a massive power supply premium components and Rotel s Balanced Design ensure superb sound quality High current capa bility allows the RB 981 to drive the most demanding loudspeakers Be aware thatthe RB 981 is capable of high power levels in ex cess of 130 watts per channel Make sure that your speakers can handle the power of the RB 981 If in doubt about your speakers ask your local Rotel audio retailer for advice The RB 981 is straightforward in its installation and operation If you have experience with other stereo power amplifiers you shouldn t find anything perplexing Plug in a pair of high quality RCA cables from your preamp into the amplifier inputs wire up your speakers and enjoy A Few Precautions Please re
9. ed binding posts on the back panel These connectors accept bare wire connector lugs or dual banana type connectors except in the European Commu nity countries where their use is not permitted Route the wire from the RB 981 to the speakers Give yourself enough slack so you can move the components enough to allow access to the speaker connectors If you are using dual banana plugs connect them to the wires and then plug into the backs of the binding posts The hexagonal thumbscrews of the binding posts should be screwed in all the way clockwise If you are using terminal lugs connect them to the wires If you are attaching bare wires directly to the binding posts separate the wire conductors and strip back the insulation from the end of each conductor Be careful notto cut into the wire strands Un screw turn counterclockwise the binding post hexagonal thumb screws Place the connector lug around the binding post shaft or insert the bundled wire into the hole in the shaft Turn the hexago nal thumbscrews clockwise to clamp the connector lug or wire firmly in place Note Be sure there are no loose wire strands that could touch adjacent wires or connectors R a T L STEREO POWER AMPLIFIER RB 981 Bridged Mono Operation See Figure 3 for bridged operation jumper setting and connec tion illustration The two channels of the RB 981 can be bridged In this configu ration the single channel produces a massive
10. jumper pin block Replace the cover of the cabinet Do not plug the RB 981 power cord back into the wall outlet until the cabinet cover has been replaced Input Connection When using the RB 981 in bridged mono mode connect the cable from the preamplifier output to the left input No connection is made to the right input Bridged Speaker Connection When using the RB 981 in bridged mono mode the wire to the speakers is connected to the positve terminals of the left and right channels Connect the wire that goes to the postive terminal of the speaker to the positve terminal of the left channel of the RB 981 Connect the wire that goes to the negative terminal of the speaker to the positve terminal of the right channel of the RB 981 No connections are made to the negative terminals of the RB 981 Troubleshooting Most difficulties in audio systems are the result of poor or wrong connections or improper control settings If you encounter prob lems isolate the area of the difficulty check the control settings determine the cause of the fault and make the necessary changes If you are unable to get sound from the RB 981 refer to the suggestions for the following conditions Front Panel Power Indicator Is Not Lit No main power to the RB 981 Check the front panel power switch Make sure that it is set to the on position Check AC power connections at the amplifier and the AC outlet Fuse Replacement If everything checks out co
11. les exposed to heat or damaged in any way Pay particular attention to the power cord at the plug and where it exits the back of the unit The power cord should be unplugged from the wall outlet if the unit is to be left unused for a long period of time Immediately stop using the unit and have it inspected and or serviced by a qualified service agency if e The power supply cord or plug has been damaged Objects have fallen or liquid has been spilled into the unit e The unit has been exposed to rain e The unit shows signs of improper operation e The unit has been dropped or damaged in any way Place the unit on a fixed level surface strong enough to support its weight Do not place the unit on a moveable cart that could tip over Figure 1 Controls and Connections Commandes et branchments Bedienelemente und Ansch sse Controles y Conexiones ROTEL POWER AMPLIFIER RB 981 POWER PROTECTION BRIDGED MONO WARNING To REDUCE THE RISK OF FIRE SPEAKER IMPEDANCE CAUTION ROTEL OR ELECTRICAL SHOCK DO NOT EXPOSE STEREO 4 OHMS MINIMUM POWER AMPLIFIER THIS EQUIPMENT TO RAIN OR MOISTURE BRIDGED 8 OHMS MINIMUM DONOT OPEN MODEL NO RB 981 AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR POWER CONSUMPTION 400W SPEAKERS RIGHT LEFT RIGHT INPUT LEFT INPUT 4 D O SERIAL NO 000
12. nd video compo nents while you are away and Power Indicator The power switch is located on the front panel of your amplifier To turn the amplifier on push the switch in The LED indicator above the switch will light indicating that the amplifier is turned on To turn the amplifier off push the button again and return it to the out position Protection Circuitry The RB 981 features a thermal protection circuit that protects the amplifier against potential damage in the event of extreme or faulty operating conditions Unlike many designs the RB 981 s protection circuit is independent of the audio signal and has no impact on sonic performance Instead the protection circuit monitors the temperature of the output devices and shuts down the amplifier if temperatures exceed safe limits Most likely you will never see this protection circuitry in action However should a faulty condition arise the amplifier will stop playing and the LED indicator on the front panel will light up If this happens turn the amplifier off let it cool down for several minutes and attempt to identify and correct the problem that caused the protection circuitry to engage When you turn the am plifier back on the protection circuit will automatically reset and the indicator LED should go out In most cases the protection circuitry activates because of a fault condition such as shorted speaker wires or inadequate ventila tion leading to an overheati
13. ng condition In very rare cases highly reactive or extremely low impedance speaker loads could cause the protection circuit to engage If the protection circuitry triggers repeatedly and you are unable to isolate and correct the faulty condition contact your Rotel au dio retailer for assistance in troubleshooting Input Signal Connection See Figure 2 for normal stereo wiring illustration The RB 981 has conventional RCA type input connectors the type found on nearly all audio equipment Note To prevent loud noises that neither you nor your speakers will appreciate make sure the amplifier is turned off when you make any signal connections Select a high quality pair of audio interconnect cables Connect the left channel output of your preamp to the left channel input on the RB 981 Connect the right channel output of your preamp to the right channel input Speaker Connection Speaker Selection We recommend using loudspeakers with a nominal impedance of 4 ohms or higher with the RB 981 You should exercise some cau tion in driving multiple pairs of speakers in parallel configuration because the effective impedance the amplifier sees is cut in half For example when driving two pair of 8 ohm speakers the ampli fier sees a 4 ohm load When driving multiple speakers in parallel itis recommended that you select speakers with a nominal imped ance of 8 ohms or higher Speaker impedance ratings are less than precise In p
14. nstallation location Make sure that the shelf or cabinet can support its considerable bulk Again use common sense Power Switch Because of its high power rating the RB 981 can draw consider able current Therefore it should be plugged directly into a 2 pin polarized wall outlet Do not use an extension cord A heavy duty multi tap power outlet strip may be used if it and the wall outlet is rated to handle the current demanded by the RB 981 and all the other components connected to it Be sure the power switch on the front panel of the RB 981 is turned off in the out position Then connect the supplied power cord to the AC power outlet Your RB 981 is configured at the factory for the proper AC line voltage in the country where you purchased it either 115 volts AC or 230 volts AC with a line frequency of either 50 Hz or 60 Hz The AC line configuration is noted on a decal on the back panel Note Should you move your RB 981 amplifier to another country itis possible to reconfigure your amplifier for use on a different line voltage Do not attempt to perform this conversion yourself Opening the enclosure of the RB 981 exposes you to dangerous voltages Consult a qualified service person or the Rotel factory service department for information If you are going to be away from home for an extended period of time such as a month long vacation it is a sensible precaution to unplug your amplifier as well as other audio a
15. ractice very few loudspeakers will present any problems for the RB 981 See your Rotel audio retailer if you have any questions ENGLISH Speaker Wire Selection Use insulated two conductor stranded wire to connect the RB 981 to the speakers The size and quality of the wire can have an au dible effect on the performance of the system Standard speaker wire will work but can result in lower output or diminished bass response particularly over longer distances In general heavier wire will improve the sound For best performance you may want to consider special high quality speaker cables Your Rotel audio retailer can help in the selection of appropriate cables for your system Polarity and Phasing The polarity the positive negative orientation of the connec tions for every speaker and amplifier connection must be con sistent so all the speakers will be in phase If the polarity of one connection is mistakenly reversed bass output will be very weak and stereo imaging degraded All wire is marked so you can iden tify the two conductors There may be ribs or a stripe on the insu lation of one conductor The wire may have clear insulation with different color conductors copper and silver There may be po larity indications printed on the insulation Identify the positive and negative conductors and be consistent with every speaker and amplifier connection Stereo Speaker Connection The RB 981 has two pairs of color cod
16. rol AC Power Input Power Switch and Power Indicator Protection Circuitry Input Signal Connection Input Signal Connection Speaker Connection Speaker Selection Speaker Wire Selection Polarity and Phasing Stereo Speaker Connection Bridged Mode Operation Resetting Jumpers Input Connection Bridged Speaker Connection 4 Troubleshooting Front Panel Power Indicator Is Not Lit Fuse Replacement No Sound Protection Indicator Is Lit Specifications PP www ww ww NNNN NNN gt PPPP ENGLISH About Rotel A family whose passionate interest in music led them to manufac ture high fidelity components of uncompromising quality founded Rotel over 30 years ago Through the years that passion has re mained undiminished and the family goal of providing exceptional value for audiophiles and music lovers regardless of their budget is shared by all Rotel employees The engineers work as a close team listening to and fine tuning each new product until it reaches their exacting musical stan dards They are free to choose components from around the world in order to make that product the best they can You are likely to find capacitors from the United Kingdom and Germany semi conductors from Japan or the United States while toroidal power transformers are manufactured in Rotel s own factory Rotel s reputation for excellence has been earned through hun dreds of good reviews and awards from the most resp
17. rrectly and you still cannot get the am plifier to turn on the internal power fuse may have blown If you believe this has happened contact your Rotel dealer for informa tion on where to take your amplifier to get the fuse replaced No Sound If the amp is getting AC power but is producing no sound check the Protection indicator on the front panel If it is lit see below If not check all of your connections and control settings on associ ated components Protection Indicator Is Lit The front panel indicator lights when the RB 981 protection cir cuits have shut off the amplifier Typically this occurs only when the ventilation openings are blocked when there is faulty speaker wiring or after a period of extreme use Turn off the system and wait for the amp to cool Then push the front panel power switch in and out to reset the protection devices If the problem is not corrected or reoccurs there is a problem with the system or the amplifier itself R a T E L STEREO POWER AMPLIFIER RB 981 Specifications Technische Daten Continuous Power Output 130 watts ch 20 20 kHz lt 0 03 8 ohms Total Harmonic Distortion 20Hz 20kHz 8 ohms lt 0 03 Intermodulation Distortion 60 Hz 7 kHz 4 1 lt 0 03 Dauerausgangsleistung 20 20 kHz lt 0 03 8 Ohm Gesamtklirrfaktor 20 20 000 Hz 8 Ohm lt 0 03 96 Intermodulationsverzerrung 60 Hz 7 kHz 4 1 lt 0 03 130 Watt pro Kanal Frequency Response
18. ts Dimensions L x H x P 440 x 121 x 305 mm Poids net 10 2 kg Impedance d entree Sensibilite Alimentation Toutes les sp cifications de cet appareil taient exactes au moment de l impression de ce guide Rotel se r serve le droit de les modifier sans pr avis Potencia Continua de Salida 130 vatios canal 20 20 000 Hz THD menor del 0 03 8 ohmios Distorti n Arm nica Total 20 20 000 Hz 8 ohmios 0 0396 Distortion por Intermodulaci n 60 Hz 7 kHz 4 1 lt 0 03 Respuesta en Frecuencia 0 5 3dB dB 4Hz 100 000 Hz Factor de Amortiguamiento 20 20 000 Hz 8 ohmios 1000 Impedancia de las Caja Ac sticas modo Normal minima de 4 ohmios Relaci n Se al Ruido norma IHF ponderaci n 120 dB 33 kohmios 1 0 V 115 voltios 60 Hz 230 voltios 50 Hz Consumo 400 vatios Dimensiones An x Al x P 440 x 121 x 305 mm Peso Neto 10 2 kg Sensibilidad Impedancia de Entrada Alimentaci n Todas estas especificaciones son correctas enel momento de la impresi n del presente manual de instrucciones Rotel se reserva el deracho a realizar modificaciones en las mismas sin aviso previo RB 931 STEREO POWER AMPLIFIER The Rotel Company Ltd 10 10 Shinsen Cho Shibuya Ku Tokyo 150 0045 Japan Phone 81 3 5458 5325 Fax 81 3 5458 5310 Rotel Deutschland Kleine Heide 12 D 33790 Halle Westf Germany Phone 05201 87170 Fax 05201 73370 Rotel of America 54 Concord Street North Reading MA 01864
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