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Rotel RB-1070 Manual

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High Current Two Channel Amplifier

RB 1070

The latest interpretation of a classic Rotel awardwinning power amplifier, the RB-1070 continues the tradition of oversized toroidal transformer and high capacity power supply. In addition, Symmetrical Signal Trace circuit topology assures the precise interchannel timing clues necessary for pinpoint stereo reproduction. At 130 watts per channel, the RB-1070 is more than capable of meeting the challenges of even the least efficient loudspeakers. An internal bridge option provides truly prodigious 330 watt output capability. Front panel LED status indicators show power, protection, and bridged mode for instant system analysis. A separate input and output for 12 volt trigger signals and detachable AC cord increase this amplifiers flexibility by allowing total integration with even the most complex remote-controlled systems.


Power Configurations: Watts/Channel: all channels driven, unbridged, 8 ohm load, 20 to 20k Hz, 0.06% THD THD (20-20,000Hz) cont. rated power one-half rated power one watt per channel IM Distortion (at rated ower, 60Hz:7kHz = 4:1): Damping Factor (8 ohms): 2 x 130 watts 130 watts (bridged mono) Input Sens. / Impedance: Frequency Response: S/N Ratio (IHF A): Power Consumption: Dimensions (W x H x D): 0.03%, maximum 0.03%, maximum 0.03%, maximum 0.03%, maximum 500 Front Panel Height: Weight (net): 1.0V / 33 kohms 4-100kHz (=0.5dB, -3dB) 120dB 400 watts 433 x 121 x 334mm 17 1/8 x 4 3/4 x 13 1/8" 109 mm, 4.3 10.2 kg / 22.4 lbs

The Rotel Co. Ltd. 10-10 Shinsen-Cho Shibuya-Ku, Tokyo 150, Japan Rotel of America 54 Concord St. N. Reading, MA 01864 USA T +F +Rotel Europe Dale Road Worthing West Sussex BN11 2BH, UK T +44 (0) 763 F +44 (0) 525


Owners Manual Manuel dutilisation Bedienungsanleitung Manuale di Istruzioni Manual de Instrucciones Gebruiksaanwijzing RB-1070
Stereo Power Amplifier Amplificateur De Puissance Stro Stereo-Endstufe Finale di Potenza Stereo Etapa de Potencia Estereofnica Stereo Eindversterker


RB-1070 Stereo Power Amplifier
WARNING: There are no user serviceable parts inside. Refer all servicing to qualified service personnel. WARNING: To reduce the risk of fire or electric 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, immediately disconnect the power cord from the wall. Take the unit to a qualified service person for inspection and necessary repairs. Read all the instructions before connecting or operating the component. 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 enclosure only with a dry cloth or a vacuum cleaner. You must allow 10 cm or 4 inches of unobstructed clearance around the unit. Do not place the unit on a bed, sofa, rug, or similar surface that could block the ventilation slots. If the component is placed in a bookcase or cabinet, there must be ventilation of the cabinet to allow proper cooling. Keep the component 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 component to the power outlet only with the supplied 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. Do not use extension cords. Do not route the power cord where it will be crushed, pinched, bent at severe angles, 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 component and have it inspected and/or serviced by a qualified service agency if: The power supply cord or plug has been damaged. Objects have fallen or liquid has been spilled into the unit. The unit has been exposed to rain. The unit shows signs of improper operation 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 it on a moveable cart that could tip over.


Figure 1: Controls and Connections Commandes et branchements Bedienelemente und Anschlsse Controlli e collegamenti Controles y Conexiones De bedieningsorganen en aansluitingen












Figure 2: Stereo Connections Branchement des entres et des enceintes en stro Anschludiagramm bei Stereobetrieb Collegamenti stereo - Ingressi e diffusori Conexin de la seal de entrada y las cajas acsticas De cinch- en luidsprekerverbindingen






Figure 3: Bridged Connection Fonctionnement en mode pont mono ( bridg ) Anschludiagramm bei Brckenschaltung Collegamenti mono configurazione a ponte- Ingressi e diffusori Conexin monofnica puenteada Gebrugde mono aansluitingen
Jumper Locations Emplacement des cavaliers Jumperpositionen Le posizioni dei ponticelli Ubicacin de los Puentes Locatie van de doorverbindingen


Figure 1: Controls and Connections Figure 2: Stereo Connections Figure 3: Bridged Connection 4

About Rotel

A family whose passionate interest in music led them to manufacture high fidelity components of uncompromising quality founded Rotel over 30 years ago. Through the years that passion has remained 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 standards. 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 Rotels own factory. Rotels reputation for excellence has been earned through hundreds of good reviews and awards from the most respected reviewers 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.

Getting Started

Thank you for purchasing the Rotel RB-1070 Stereo Power Amplifier. When used in a highquality music or home theater system, it will provide years of musical enjoyment. The RB-1070 is a high-power, two-channel power amplifier, providing the highest level of audio performance. Discrete output devices, a massive power supply, premium components, and Rotels Balanced Design ensure superb sound quality. High current capability allows the RB-1070 to drive the most demanding loudspeakers. Be aware that the RB-1070 is capable of high power levels, in excess of 130 watts per channel. Make sure that your speakers can handle the power of the RB-1070. If in doubt about your speakers, ask your authorized Rotel dealer for advice. The RB-1070 is straightforward in its installation and operation. If you have experience with other stereo power amplifiers, you shouldnt 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.
Contents.. 5 About Rotel.. 5 Getting Started.. 5 A Few Precautions Placement 5 6
AC Power and Control.. 6 AC Power Input Power Switch and Power Indicator Trigger ON/OFF Mode Selector 12V Trigger Input and Output Protection Circuitry Input Signal Connection 6
Speaker Connection. 7 Speaker Selection Speaker Wire Selection Polarity and Phasing Stereo Speaker Connection Bridged Mono Operation Resetting Jumpers Input Connection Bridged Speaker Connection 7 7. 7 7

A Few Precautions

Please read this manual carefully. In addition to basic installation and operating instructions, it provides valuable information on various RB-1070 system configurations as well as general information that will help you get optimum performance from your system. Please contact your authorized Rotel dealer for answers to any questions you might have. In addition, all of us at Rotel welcome your questions and comments. Save the RB-1070 shipping carton and all enclosed packing material for future use. Shipping or moving the RB-1070 in anything other than the original packing material may result in severe damage to your amplifier. Fill out and send in the owners registration card packed with the RB-1070. 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.
Troubleshooting.. 8 Front Panel Power Indicator Is Not Lit Fuse Replacement No Sound Protection Indicator Is Lit 8 8

Specifications.. 8

RB-1070 Stereo Power Amplifier Placement
The RB-1070 generates heat as part of its normal operation. The heat sinks and ventilation openings in the amplifier are designed to dissipate this heat. The ventilation slots in the top cover must be open. There should be 10 cm (4 inches) of clearance around the chassis, and reasonable airflow through the installation location, to prevent the amplifier from overheating. Likewise, remember the weight of the amplifier when you select an installation location. Make sure that the shelf or cabinet can support its considerable bulk. Again, use common sense.
If you are going to be away from home for an extended period of time such as a monthlong vacation, it is a sensible precaution to unplug your amplifier (as well as other audio and video components) while you are away.

Protection Circuitry

The RB-1070 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-1070s 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 amplifier 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 ventilation leading to an overheating 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 authorized Rotel dealer for assistance in troubleshooting.

Power Switch Indicator

and Power
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.

AC Power and Control

AC Power Input
Because of its high power rating, the RB-1070 can draw considerable 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-1070 and all the other components connected to it. Be sure the power switch on the front panel of the RB-1070 is turned off (in the out position). Then, connect the supplied power cord to the AC power outlet. Your RB-1070 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-1070 amplifier to another country, it is 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-1070 exposes you to dangerous voltages. Consult a qualified service person or the Rotel factory service department for information.
Trigger ON/OFF Mode Selector
The Amplifier provides the option for manual or automatic power on/off operation. These modes are selectable using a toggle switch on the back panel. With the switch in the +12V TRIGGER ON position, the amplifier is turned on automatically when a 12V trigger signal is present at the 3.5 mm Jack of TRIGGER IN on the rear panel. The amplifier will go into standby mode if the +12V signal is not present. The front panel POWER SWITCH overrides this function. It must be ON for the +12V trigger to work. Turning the switch OFF cuts power to the amplifier, regardless of whether or not a trigger signal is present.
12V Trigger Input and Output
The jack labeled IN is for connecting the 3.5mm Plug/Cable carrying a +12 volt trigger signal to turn the amplifier on and off. To use this feature the toggle switch must be set to the ON position. This input accepts any control signal (AC or DC) ranging from 3 volts to 30 volts. The jack labeled OUT is for connecting another 3.5mm plug/cable to provide a 12V trigger signal to other components. The 12V output signal is available whenever a +12 volt trigger signal is applied to the IN connector.

Input Signal Connection

[See Figure 2 for normal stereo wiring illustration.] The RB-1070 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-1070. Connect the right channel output of your preamp to the right channel input.
In order to use the RB-1070 in bridged mode, three jumper connectors inside the amplifier must be moved from one set of pins to another. This task should be done by a qualified technician. See your authorized Rotel dealer. In addition the RB-1070 is connected to the other components in a different way. When the RB-1070 is setup for bridged operation on the the Bridged Mono indicator light front panel will light.

Speaker Connection

Speaker Selection
We recommend using loudspeakers with a nominal impedance of 4 ohms or higher with the RB-1070. You should exercise some caution 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 amplifier sees a 4 ohm load. When driving multiple speakers in parallel, it is recommended that you select speakers with a nominal impedance of 8 ohms or higher. Speaker impedance ratings are less than precise. In practice, very few loudspeakers will present any problems for the RB-1070. See your authorized Rotel dealer if you have any questions.
Stereo Speaker Connection
The RB-1070 has two pairs of color coded binding posts on the back panel. These connectors accept bare wire, connector lugs, or dual banana type connectors (except in the European Community countries where their use is not permitted). Route the wire from the RB-1070 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 not to cut into the wire strands. Unscrew (turn counterclockwise) the binding post hexagonal thumbscrews. Place the connector lug or wire around the binding post shaft. Turn the hexagonal thumbscrews clockwise to clamp the connector lug or wire firmly in place.

Resetting Jumpers

Before opening the RB-1070 cabinet to reset the jumpers, the power cord must be unplugged from the wall. DO NOT OPEN THE CABINET OF THE RB-1070 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-1070 to bridged mono move all three jumpers so they are on pins 2 and 3 of each jumper pin block. Replace the cover of the cabinet. Do not plug the RB-1070 power cord back into the wall outlet until the cabinet cover has been replaced.

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the RB-1070 to the speakers. The size and quality of the wire can have an audible 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 authorized Rotel dealer can help in the selection of appropriate cables for your system.
Note: Be sure there are no loose wire strands that could touch adjacent wires or connectors.

Bridged Mono Operation

[See Figure 3 for bridged operation jumper setting and connection illustration.] The two channels of the RB-1070 can be bridged. In this configuration the single channel produces a massive 330 watts! This feature allows you to increase the overall power output of your system by bridging the RB-1070 and adding a second bridged RB1070. Or the RB-1070 is bridged to drive a monophonic subwoofer. Note however that when the RB-1070 is bridged the speaker connected to it must have an impedance of 8 ohms or more.

Polarity and Phasing

The polarity the positive/negative orientation of the connections for every speaker and amplifier connection must be consistent 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 identify the two conductors. There may be ribs or a stripe on the insulation of one conductor. The wire may have clear insulation with different color conductors (copper and silver). There may be polarity indications printed on the insulation. Identify the positive and negative conductors and be consistent with every speaker and amplifier connection.

Input Connection

When using the RB-1070 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-1070 in bridged mono mode, the wire to the speakers is connected to the positive terminals of the left and right channels. Connect the wire that goes to the positive terminal of the speaker to the positive terminal of the left channel of the RB-1070. Connect the wire that goes to the negative terminal of the speaker to the positive terminal of the right channel of the RB-1070. No connections are made to the negative terminals of the RB-1070.


Most difficulties in audio systems are the result of poor or wrong connections, or improper control settings. If you encounter problems, 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-1070, refer to the suggestions for the following conditions:


Continuous Power Output (20-20 kHz, < 0.03%) Bridged Mono Power Output (20-20 kHz, < 0.1%) Total Harmonic Distortion (20Hz-20kHz, 8 ohms) Intermodulation Distortion (60 Hz : 7 kHz, 4:1) Frequency Response (+0.5 dB, -3 dB) Damping Factor (20-20,000 Hz, 8 ohms) Speaker Impedance Signal to Noise Ratio (IHF A network) Input Impedance/Sensitivity Power Requirements Power Consumption Dimensions (W x H x D) Weight (net) 130 watts/ch into 8 ohms 330 watts/ch into 4 ohms < 0.03% < 0.03% 4Hz-100kHz ohms minimum 120 dB 33 k Ohms/1.0 volt 115 Volts, 60 Hz (U.S. version) 230 Volts, 50 Hz (European version) 400 Watts 430 x 121 x 350 mm 1615/16 x 4 3/4 x 133/4 in 11.9 kg, 26.25 lb.
Front Panel Power Indicator Is Not Lit
No main power to the RB-1070. 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 correctly and you still cannot get the amplifier to turn on, the internal power fuse may have blown. If you believe this has happened, contact your authorized Rotel dealer for information on where to take your amplifier to get the fuse replaced.



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