Rotel RB-991 User's Manual
Contents
1. ROTEL RB991 Stereo Power Amplifier with RCA amp XLR Inputs OWNERS MANUAL Please write the serial number date of purchase and the name of Rotel hifi Authorized Dealer in the spaces provided for your future reference Serial number Purchase date Rotel hifi Authorized Dealer SAFETY INSTRUCTIONS CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVIGEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL Explanation of Graphical Symbols y Nana me yma rn Shere nvr cun N meni mes tamm Turm Pg N T ilte ad bor Wr plane 2 Retain instructione u soley wel os reto Senta tK Mur revo 3 Went on pay atone Pot ute 4 Follow tutions AI png an ewt ee u ato aed Noise plene sud ro bn ina war woe ange rama ren sary bare c w irr te II Carta and Sande The spare so sd any a cet arn By PORTABLE CART WARNING pilane aedi na 1 or Cling Mounting wo mauris lal as br e vatur entation The glo te vts a utl locaton ou porto cos rot rari wir ta peser vw Far seo doa o ba weed ora bed e v c ai Hn Hecke son rios abuti a care r ay Fa ough veio pairs 8 He Th stout te sated asy erv oes2. objects to fall into the amplifier as these will damage the circuitry Avoid installing the amplifier in a location where excessive humidity vibration or moisture will be a problem We recommend installing the 991 in fumiture designed to house hi f components Audio component furniture will reduce or suppress vibration All audio components will provide Improved sound when free from vibration Ask your ROTELhi fi AUTHORIZED DEALER lor advice about component fumiture and proper installation of audio components Please be careful to keep digital video or audio signal cables and the power cords separated in your installation This will minimize the chance interference from the power cords or digital cables getting into the analog or video signal cables We recommend high quality shielded cables in sound systems to minimize any potential interference ELECTRICAL REQUIREMENTS Ths amplifier is designed to operate on AC voltage and the correct voltage is displayad on the back panel Do not attempt to operate the amplifier on incorrect voltage as this wil damage the circultny and void your warranty you are in doubt about the comect voltage for this amplifier we suggest reading the label on the back panel or consult your ROTELhi fi AUTHORIZED DEALER for confirmation of the correct voltage Connect fne POWER CORD to your wall socket for AC power When you wish to disconnect the power cord from the wall grasp the plug firmly in you
3. AMPLIFIER TURNED ON IS THE SOURCE COMPONENT TURNED ON 15 THE SOURCE COMPONENT CONNECTED PROPERLY ARE THE SPEAKER WIRES CONNECTED PROPERLY NO BASS 15 THE SUBWOOFER AMPLIFIER TURNED ON 15 THE POWERED SUBWOOFER TURNED ON ARE THEWOOFERS IN YOUR SPEAKERS DAMAGED ARE THE SPEAKERS WIRED CORRECTLY FOR PHASE IS THE DISC DIRTY OR SCRATCHED IS THE DISC 3 CD PLAYER SEVERELY WARPED IS THE DISC SEMI TRANSPARENT OR POORLY MADE WITH VISIBLE PIN HOLES IS THE CD CRACKED POOR DULL SOUND ARE THE HEADS DIRTY HEADS MAGNETIZED FROM LONG WOW amp FLUTTER USAGE WITHOUT DEMAGNETIZING ARE THE PINCH TAPE DECK ROLLER AND THE CAPSTAN DIRTY CLEAN WITH PURE ALCOHOL 0 TIP COTTON BUDS OR A TAPE DECK CLEANING KIT DEMAGNETIZE THE HEADS WITH A HAND HELD DEMAGNETIZER DO NOT USE ABRASIVE DRY CLEANERS Hi _ _ FM RADIO AM RADIO OVERLOADING SMALL SPEAKERS TOO LOUD VOLUME CLIPPING YOUR AMPLIFIER VIDEO DIGITAL AND AUDIO CABLES TOUCHING THE AC CORD SHOULD BE SEPARATE FROM SIGNAL CABLES SIGNAL CABLES LAYING NEAR A LARGE POWER TRANSFORMER SUCH AS IN A POWER AMPLIFIER DEFECTIVE OR UNSHIELDED SIGNAL CABLES 15 ANOTHER COMPONENT STACKED ON THE AMPLIFIER 15 THE AMPLIFIER ENCLOSED IN A SMALL SPACE A MINIMUM OF 3 TO 4 8 10 CM CLEARANCE IS NEEDED ABOVE THE AMPLIFIER IN A SYSTEM DO NOT STACK COMPONENTS ON THE AMPLIFIER AN AMPLIFIER NEEDS TO BREATHE FREELY TO STAY COOL IS THE ANTE
4. RB 990BX power amplifier We have been designing and manufacturing high quality high perlormance audio electronics for more than 35 years We are famous for our love of music and our passion for good sound This power amplifier was designed to offer sound and is a natural extension of love of music If the RB 991 is used with the companion RB 993 a 3 channel power amplifier it Wil be an excellent foundation for superb surround sound or music system We believe that the music and soundtracks played through this amplifier wil be a source of enjoyment to you for many years to come We designed this amplifier to be durable easy to operate and to have high fidelity to The original sound Please read this owners manual to ensure that the amplifier is properly installed We appreciate being a of your RB 991 DESIGN FEATURES front panel look reflects the fact that we have made some important changes to this couple of examples would be the toroidal power transformer of our own design and manufacture and the inclusion of balanced XLR inputs The massive power supply is derived from a large Rotel toroidal power transformer The RB 991 has a highly regulated power supply to ensure maximum power capability into dificult speaker loads This type of design is more expensive to manufacture but It is beter forthe music This power amplifier wil drive 4 ohm rated speakers very well All aspects of this design have been examined with
5. the fal goals being stabilty when driving low impedance or adverse speaker loads and the faithful reproduction of music This is an excellent for music stening surround sound or mult room custom Instalations We have designed the printed circuit boards PCB with symmetrical circuit traces This insures that the precisa timing ol the music is maintained and tathtuly recreated Circul races of different lengths change the timing between the channels slightly This degradation of signal coherence is unacceptable to us The PCB circuit races are used o transfer the delicate audio signals because we feel this is more consistent than using wire jumpers for this purpose The PCB contains metal fim resistors and polystyrene or polypropylene capacitors in sonically selected locations WHERE TO FIND INFORMATION IN THIS OWNERS MANUAL INSTALLATION PAGE23 FRONT PANEL CONTROLSINDICATORS PAGE3 REAR PANEL CONNECTIONS PAGE4 FRONT AND BACK PANEL DRAWINGS PAGES 4 SPECIFICATIONS PAGES TROUBLESHOOTING GUIDE PAGES RB 991 INSTALLATION Please place the unit on a DRY level surface away from direct sunlight Please do not stack other components on top of the RB 991 as they may cause the amplifier to overheat We suggest 75 mm lt 3 as a minimum clearance above the RB 991 If the amplifier is installed inside cabinet please be certain that here is adequate airflow or a cooling fan to ensure proper cooling Do not allow water Ww
6. NNA CONNECTED PROPERLY IS THE ANTENNA MOUNTED AS HIGH AS POSSIBLE IS THE ANTENNA ORIENTED FOR BEST RECEPTION IS THE FM STATION DISTANT AN OUTDOOR ANTENNA MAY BE NECESSARY ADJUST THE ANTENNA FOR BEST RECEPTION IS THE ANTENNA CONNECTED PROPERLY I5 THERE A LARGE ELECTRICAL MOTOR COMPUTER OR COMPRESSOR NEAR THE TUNER OR ANTENNA NOISE IS EASILY RECEIVED IN THE AM BAND ADJUST THE AM ANTENNA FOR BEST RECEPTION AND MINIMUM INTERFERENCE CONTINUED PROBLEMS ASK YOUR ROTELhi fi AUTHORIZED DEALER FOR HELP FAXCYTEEL A THE ROTEL CO LTD IBUNZAN SHNSEN BLD 4F 1 10 SHNSEN CHO SHBUYA Ku TOKYO 150 JAPAN
7. chan date vote pace Put rie APPLICABLE FOR USA CANADA OR WHERE APPROVED TO THE USAGE ESAESONDANTE DE LA PRISE EY POUSSER KO FONO 10 Power Soure 7w glance l bo cam Y TW d n seti acer retiree PoemeCort Proin oes si not bn na Ne me aly nb wie che by ara chc so agens Wer paru enn e cot anaes cadet Pa me oy i an l spine 12 Cleaning The asplancs obrui te miu 7 ones Perio Ta ow epee shee w Vcg wr vw udi o poned O YW M Objet and Liga Emmy Cara vaut te tice 30 sat d Sd w sse ve I Damage Service The pice Ae bn k A The somes or plag has teen dumagat or tavo tau ha onar pe te C Te pace as bar ut 2 piace dos aa aspen coma revel ame arg h paromana a E e aypa of Saag 16 Servicing be seven apalane ngos tone nae tdi Ye mentor Alli waredequliec sev pone 17 Grounding or Polartzation Tw prc Na shoki by Sen an ate gran o 9 n A WORD FROM ALL OF US AT ROTEL Thank you for purchasing our RB 991 stereo power ampllier This replaces our highly acclaimed
8. d inputs please switch the back panel selector switch to the BALANCED input setting The SPEAKER terminals are color coded to help with you make corect connections The speaker terminals are red fr postive and black or negative connections peser have he sare cor ding system for these connections Please ensure these connections are correct before tuming the aller ON or ihe ime Icone phase connections ample lo speaker in ol ho channels for example harm anything but wil result in lile or no bass response in your system The SPEAKER terminals will accept spade connectors bare wire or banana plugs Non mark countries lor speaker connections Regardless of the type of speaker wire connection made please check to see that no stray wires are touching between the positive and negative speaker terminals lor each channel This wil cause an intemal protection fuse to fail and the amplifier will not play Please remember that this is a high powered amplifier and tum it otf belore making any changes to the connections or unplugging any input cables This will avoid any potential damage to the delicate eeters in your speakers Transient sounds may occur when connecting or disconnecting input patch cables if a power amplifier is on FEW FINAL WORDS FROM THE PEOPLE AT ROTEL We have designed this amplifier using high performance test equipment and highly trained human ears We believe both methods are useful in
9. r hand to pull it oul of the socket Do not unplug the power cord by pulling the cord only This may damage the power cord and create a hazardous condition We strongly recommend that the amplifier be connected to the maln s wall socket or an AC power line fier not an extension cord I you wish fo clean the cabinet we suggest clean soft DRY cloth Never use cleaning compounds or solvents to clean the cabinet as thay may damage the finish or remove the labels These could damage the ciculry it any residue falls inside the ampifier There is NO user serviceable part inside this amplifier Please do not open the cabinet as this will expose you to the risk of potentially dangerous voltage and the risk of electric shock WW FRONT PANEL ll I III FRONT PANEL CONTROLS INDICATOR LIGHTS The fron panel includes the POWER button the POWER and PROTECTION indicator lights Press the POWER button once the ampli er wil turn ON the POWER and PROTECTION brief indicator lights wil luminate Press it again the amplifier will tum OFF and all the indicator lights will extinguish REAR PANEL CONNECTIONS Wan connecting lease be certain o he correct routs o he appropiate sh or tight R L channels from your preamplifier or processor outputs to avoid incorrect chann Pachani dung playback of your lavora musk or mores yu are ue the LFVEalanee
10. the design of high fidelity audio electronics This method Of design and manutacturing consuming but we lhe music benets fom care and attention lo detail With our reputation for excellent reliability and sound quailty you can be certain that the RB 991 represents excellent value for your money We realize that there are many choices available and we thank you again for choosing the RB 991 for use in your sound system Enjoy the music eee SPECIFICATIONS Continuous Power Output 20 20 kHz lt 0 03 B ohms 200 wattsich 20 20 kHz lt 0 05 4 ohms 300 watts ch Total Harmonic Distortion 20 Hz 20 kHz B ohms 50 08 Intermodulation Distortion 60 Hz 7 kHz 4 1 50 08 Frequency Response gt 10 100 000 Hz 1 dB Damping Factor 00 20 000 Hz B ohms 2500 Speaker Impedance 4 16 ohms Signal lo Noise Ratio IHF A network 12008 Input Impedance Sensitivty RCA Inputs 33 k Ohms 1 0 vol XLR Inputs Ohms 0 volt Power Requirements 115 Volts 0 Hz or 230 Volts 50 Hz Power Consumption 550 Watts Dimensions W H DJ 440x 127 x 385 mm 17 38 4 76 15 16 Weight ne 167 kg 3674 b All specifications are accurate a the time of printing Rotel reserves the right to make improvements without notice SYSTEM TROUBLESHOOTING HINTS NO POWER IS THE AC CORD CONNECTED TO A SWITCHED AC OUTLET IS THE SWITCHED AC OUTLET TURNED ON CHECK THE POWER FUSE FOR THE AC OUTLET NO SOUND CORRECT INPUT SELECTED IS THE
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