RMB1504 - Receiver ROTEL - Free user manual and instructions

USER MANUAL RMB1504 ROTEL

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 expose the unit to dripping or splashing. Do not place objects filled with liquids, such as vases, on the unit. 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 these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with dry cloth. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. Only use attachments/accessories specified by the manufacturer. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/ apparatus combination to avoid injury from tip-over. Unplug this apparatus during lightning storms or when unused for long periods of time. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. The apparatus should be used in non tropical climate. The ventilation should not be impeded by covering the ventilation openings with items, such as newspapers, table-cloths, curtains, etc. No naked flame sources, such as lighted candles, should be placed on the apparatus. Rotel products are designed to comply with international directives on the Restriction of Hazardous Substances (RoHS) in electrical and electronic equipment and the disposal of Waste Electrical and Electronic Equipment (WEEE). The crossed wheelie bin symbol indicates compliance and that the products must be appropriately recycled or processed in accordance with these directives. Important Safety Instructions You must allow a minimum 10 cm or 4 inches of unobstructed clearance around the unit.

The rear panel power cord connector is the mains power disconnect device. The device must be located in an open area that allows access to the cord connector. The unit must be connected to a power supply only of the type and voltage specified on the rear panel. (USA: 120 V/60Hz, EC: 230V/50Hz) Connect the component to the power outlet only with the supplied power supply cable or an exact equivalent. Do not modify the supplied cable. Do not use extension cords. The mains plug is the disconnect of the unit. In order to completely disconnect the unit from the supply mains, remove the main plug from the unit and the AC power outlet. This is the only way to completely remove mains power from the unit. Use Class 2 wiring for speaker connections to ensure proper installation and minimize the risk of electrical shock. This symbol means that this unit is double insulated. An earth connection is not required.3 Figure 1: RMB-1504 Controls and Connections Commandes et Branchements RMB-1504 RMB-1504 Bedienelemente und Anschlüsse Controles y Conexiones de la RMB-1504

• Four-channel power amplier, with 70 watts per channel output into 8 ohms.

• Front panel input level controls.

• User-selectable power on/off conguration: manual, automatic signal sensing, or controlled by remote 12 volt trigger signal.

• Protection circuitry against fault conditions with front panel indicators.

• Input linking, input mono switch and signal output link connectors for maximum system conguration exibility. A Few Precautions

WARNING: To avoid potential damage to your system, turn off ALL the

• components in the system when connecting or disconnecting the loudspeakers or any associated components. Do not turn the system components back on until you are sure all the connections are correct and secure. Pay particular attention to the speaker wires. There must be no loose strands that could contact the other speaker wires, or the chassis of the amplifier. Please read this manual carefully. In addition to installation and operating instructions, it provides valuable information on various RMB-1504 system congurations 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 shipping carton and all enclosed packing material for future use. Shipping or moving the RMB-1504 in anything other than the original packing material may result in severe damage to your amplier. If included in the box please complete the owner’s registration card or register on line. Also be sure to keep the original sales receipt. It is your best Contents Important Safety Instructions p. 2
• Figure 1: Controls and Connections 3 Figure 2: Analog Inputs and Speaker Output Connections 4 Important Notes 5 About Rotel p. 6
• Getting Started p. 6
• Features 6 A Few Precautions 6 Placement 7 AC Power and Control p. 7
• AC Power Input - 7 Power Switch and Power Indicator 1 7 Auto Turn On/Off Mode Selector 7 7 12 Volt Trigger Input 6 7 12 Volt Trigger Output 6 7 Circuit Breaker 0 7 Protection Circuitry 2 7 Signal Connections p. 8
• RCA Inputs 4 8 Mono Switch 4 8 Linking the Inputs 4 8 Input Level Controls 3 8 Signal Output Link 5 8 Speaker Connection p. 8
• Speaker Selection 8 Speaker Wire Selection 8 Polarity and Phasing 8 Speaker Connection 89 8 Troubleshooting p. 9
• Power Indicator Is Not Illuminated 9 No Sound 9 Protection Indicator 9 Specications About Rotel Our story began over 50 years ago. Over the decades, we have received hundreds of awards for our products and satised hundreds of thousands of people who take their entertainment seriously - like you! Rotel was founded by a family whose passionate interest in music led them to manufacture high-delity components of uncompromising quality. 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. Rotel’s engineers work as a close team, listening to, and ne 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 nd capacitors from the United Kingdom and Germany, semiconductors from Japan or the United States, while toroidal power transformers are manufactured in Rotel’s own factory. We all have concerns about our environment. And, as more and more electronics are produced it is especially important for a manufacturer to do all it can to engineer products that have a minimum impact on the environment.7 record of the date of purchase, which you will need in the event warranty service is ever required. Placement The RMB-1504 generate heat as part of its normal operation. The heat sinks and ventilation openings in the amplier 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 airow through the installation location, to prevent the amplier from overheating.Remember the weight of the amplier when you select an installation location. Make sure that the shelf or cabinet can support it. We recommend installing the unit in furniture designed to house audio components. Such furniture is designed to reduce or suppress vibration which can adversely affect sound quality. Ask your authorized Rotel dealer for advice about component furniture and proper installation of audio components. AC Power and Control AC Power Input - Your amplier is congured at the factory for the proper AC voltage in the country where you purchased it, either 120 volts or 230 volts. The AC line conguration is noted on a decal on the back panel.NOTE: Should you move your amplifier to another country, it may be possible to reconfigure it for use on a different line voltage. Do not attempt to perform this conversion yourself. Opening the enclosure of the amplifier exposes you to dangerous voltages. Consult a qualified service person or the Rotel factory service department for information.NOTE: Some products are intended for sale in more than one country and as such are supplied with more than one AC cord. Please use only the cord appropriate for your country/region.Because of its high power rating, the amplier can draw considerable current. Therefore, it should be plugged directly into a polarized wall outlet using the supplied cable or other high current compatible cable as recommended by your authorized Rotel dealer. 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 amplier and all the other components connected to it.Be sure the POWER SWITCH on the front panel of the amplier is turned off (in the “out” position). Then, connect the supplied power cord to the Power Connector on the rear of the unit and the AC power outlet.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 amplier (as well as other audio and video components) while you are away. Power Switch and Power Indicator 1 The power switch is located on the left side of the front panel. To turn the amplier on, push the switch in. The ring around the switch will light up, indicating that the amplier is turned on. To turn the amplier off, push the button again and return it to the “out” position.NOTE: Place the self adhesive ring over the light surrounding the Power switch if the blue light is too bright. Auto Turn On/Off Mode Selector 7 The RMB-1504 provides three different options for manual or automatic power on/off operation. These modes are selectable using a three-position slide switch on the back panel as follows: p. 9

• With the switch in the OFF position, the amplier is turned on or off manually using the front panel power switch. Also use this mode if you are using a switched AC outlet to control power to the amplier.
• With the switch in the SIGNAL SENSE position, the amplier turns on automatically when a signal is detected at the inputs. The amplier will go into standby mode several minutes after a signal is no longer present. The front panel power switch overrides this function. It must be ON for the signal sensing to work. Turning the switch OFF cuts power to the amplier, regardless of whether or not a signal is present.
• With the switch in the 12V TRIG position, the amplier is turned on automatically when a 12 volt trigger signal is present at the 12V TRIG input to the left of the switch. The amplier goes into standby mode if the +12 volt 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 amplier, regardless of whether or not a trigger signal is present. 12 Volt Trigger Input 6 An input jack for connecting the wires carrying a +12 volt trigger signal from a Rotel preamp or surround sound processor to turn the amplier on and off. To use this feature the adjacent slide switch must be placed to the left position (see previous section).The TRIGGER INPUT accepts any control signal (AC or DC) ranging from 3 volts to 30 volts. Use a cable with mono 3.5 mm mini-plugs on both ends. The +12V DC signal appears at the “tip” connector. 12 Volt Trigger Output 6 The 12V TRIG jack labeled OUT is used to pass the remote turn-on signal to a second Rotel amplier. Any 12V Trigger signal at the INPUT jack will be passed through to the OUT jack. Circuit Breaker 0 A circuit breaker on the rear panel protects the amplier’s electrical circuity. Generally, the circuit breaker will only open under a fault condition which results in excessive current draw. To reset the circuit breaker, press the button. Should it repeatedly open, contact your authorized Rotel dealer for troubleshooting assistance. Protection Circuitry 2 The RMB-1504 feature thermal and over-current protection circuits that protect against potential damage in the event of extreme or faulty operating conditions. Unlike many designs, these protection circuits are independent of the audio signal and have no impact on sonic performance. Instead, the protection circuits monitors the temperature of the output devices and the current they are handling and shuts down the amplier if operating conditions exceed safe limits.Most likely, you will never see this protection circuitry in action. However, should a faulty condition arise, the amplier will stop playing and one or more of the PROTECTION LEDS on the front panel will light.If this happens, turn the amplier off, let it cool down for several minutes, and attempt to identify and correct the problem. There are independent8 RMB-1504 Four Channel Power Amplier Signal Output Link

This pair of RCA connections can be used to pass the unprocessed input signals to another audio component, for example to “daisychain” an additional amplier to drive a second set of speakers. The input signals connected to the “A” channels is also available at these LINK outputs. NOTE: These input signals from the “A” channels can also be linked to the “B” inputs by playing the INPUT SELECT switch associated with that pair of channels in the LINK position. Speaker Connection The RMB-1504 has two groups of speaker connectors, one for each pair of amplier channels. Speaker Selection We recommend using loudspeakers with a nominal impedance of 4 ohms or higher with the RMB-1504. You should exercise some caution in driving multiple pairs of speakers in parallel conguration, because the effective impedance the amplier sees is cut in half. For example, when driving two pair of 8 ohm speakers, the amplier 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 RMB-1504. See your authorized Rotel dealer if you have any questions. Speaker Wire Selection Use insulated two-conductor stranded wire to connect the amplier 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 cables for your system. Polarity and Phasing The polarity, the positive/negative orientation of the connections, for every speaker and amplier connection must be consistent so all the speakers will be in phase. If the polarity of one connection is 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 amplier connection. Speaker Connections

See Figure 2 NOTE: The following text describes both binding post and plug-in connections. DO NOT use both connection methods in combination to connect multiple speakers. Turn off all the components in the system before connecting the speakers. The RMB-1504 have two color coded connections for each group of amplier channels, one for the left speaker, the other for the right speaker. Labels above the connectors show the proper connections for connecting speakers. These speaker connectors accept bare wire, connector lugs, or PROTECTION LEDS for each pair of channels which may help in troubleshooting the cause of the problem. When you turn the amplier back on, the protection circuit will automatically reset and the PROTECTION LEDS should go out, indicating that the amplier has recovered and the fault corrected.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. Signal Connections The RMB-1504 has conventional RCA type input connectors, the type found on nearly all audio equipment. There is also a pair of SIGNAL OUTPUT LINK connections for passing the input signal connected to the “A” pair of channels on to another audio component. Additionally, the input signal to the “A” pair of channels can be automatically linked to the inputs for the “B” channels, so that a separate input signal cable is not required for those channels, for example in large systems where the RMB-1504 is being used to drive multiple pairs of speakers.NOTE: To prevent loud potentially damaging noises, make sure the amplifier is turned off when you make any changes to the input signal configuration. RCA Inputs

See Figure 2There is one RCA input for each of the two pair of amplier channels. These RCA inputs accept audio signals from preampliers or surround sound processors. Use high quality audio interconnect cables for best performance.For each pair of amplier channels, connect the left channel output of your preamp to the LEFT INPUT on the RMB-1504. Connect the right channel of your preamp to the RIGHT INPUT. Make sure that the input slide switch to the right of the RCA inputs is in the STEREO position. Mono Switch

When the MONO switch is in the ON position, the “A” left channel input is connected to the right channel. Linking the Inputs

You can link the inputs for groups “B” to the “A” inputs by placing the input slide switch to the right of the “B” pair of RCA inputs in the LINK position. When linked, no input connection is required for that group. The input signal from the “A” group is sent to the linked pair of channels, allowing you to use all four amplier channels with the same stereo input signals. Input Level Controls

WAARSCHUWING: OM ELEKTRISCHE SCHOKKEN TE