Rotel RMB-1504 User manual

Owner’s Manual
Manuel de l’utilisateur
Bedienungsanleitung
Manual de Instrucciones
Gebruikershandleiding
Manuale di istruzioni
Instruktionsbok
Инструкция пользователя
RMB-1504
Four Channel Power Amplier
Ampli cateur de Puissance 4 Canaux
Etapa de Potencia de 4 Canales
Finale di Potenza a 4 Canali
Vierkanal-Endstufe
4 Kanalen Eindversterker
4-Kanals Slutsteg
4-Канального Усилитель Мощности

2RMB-1504 Four Channel Power Amplier
WARNING: There are nouser serviceable parts inside. Referall 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.
WARNING: 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
1
456 7
-
0
9
8
2 3
RMB-1504 Bedieningselementen en aansluitingen
RMB-1504 Controlli e connessioni
RMB-1504: Kontroller och anslutningar
Органы управления и разъемы RMB-1504

4RMB-1504 Four Channel Power Amplier
Figure 2: Analog Inputs and Speaker Output Connections Analoge ingangen en luidsprekeruitgangen
Branchements des entrées analogiques et sorties enceintes acoustiques Collegamenti ingressi analogici ed uscite diffusori
Analoge Eingänge und Anschließen der Lautsprecher Analoga ingångar och högtalaranslutningar
Entradas Analógicas y Conexiones de Salida a las Cajas Acústicas Аналоговые входы и выходы на колонки
STANDB YSTANDB Y
RSP-1576
HDMI
MUTE2CH SUR + DISPLAYBYPASS
VIDEO 1 VIDEO 2 VIDEO 3 VIDEO 4 VIDEO 5 VIDEO 6 VIDEO 7
USB PC-USB XLR TUNER CD PHONO BT
5V 2.1A

5
Important Notes
When making connections be sure to:
4Turn off all the components in the system before hooking up any components, including loudspeakers.
4Turn off all components in the system before changing any of the connections to the system.
It is also recommended that you:
4Turn the volume control of the amplier all the way down before the amplier is turned on or off.
Remarques importantes
Pendant les branchements, assurez-vous que :
4Tous les maillons sont éteints avant leur branchement, quels qu’ils soient, y compris les enceintes acoustiques.
4Éteignez tous les maillons avant de modier quoi que ce soit au niveau de leurs branchements, quels qu’ils soient.
Il est également recommandé de :
4Toujours baissez le niveau sonore via le contrôle de volume, avant d’allumer ou d’éteindre l’amplicateur.
Wichtige Hinweise
Achten Sie beim Herstellen der Verbindungen auf Folgendes:
4Schalten Sie alle Komponenten im System ab, bevor Sie Geräte (einschließlich Lautsprecher) anschließen.
4Schalten Sie alle Komponenten im System ab, bevor Sie Anschlüsse im System verändern.
Ferner empfehlen wir, dass
4Sie die Lautstärke herunterdrehen, bevor Sie den Verstärker ein- oder abschalten.
Notas Importantes
Cuando realice las conexiones, asegúrese de que:
4Desactiva todos los componentes del equipo, cajas acústicas incluidas, antes de conectar cualquier nuevo componente en el mismo.
4Desactiva todos los componentes del equipo antes de cambiar cualquier conexión del mismo.
También le recomendamos que:
4Reduzca el nivel de volumen de su amplicador a cero antes de activarlo o desactivarlo.
Héél belangrijk
Bij het maken van de verbindingen:
4Zorg dat niet alleen de RMB-1504, maar de gehele installatie uitstaat, als nog niet alle verbindingen gemaakt zijn.
4Zorg dat niet alleen de RMB-1504, maar de gehele installatie ook uitstaat, als u verbindingen gaat wijzigen.
Wij raden u ook aan om:
4de volumeregelaar van de (voor)versterker geheel dicht te draaien (volkomen linksom) wanneer u uw eindversterker aan- of uitzet.
Note importanti
Quando effettuate i collegamenti assicuratevi di:
4Spegnere tutti i componenti del sistema prima di collegare qualsiasi componente, inclusi i diffusori.
4Spegnere tutti i componenti del sistema prima di modicare qualsiasi connessione nel sistema.
Vi raccomandiamo inoltre di:
4Portare il volume a zero prima di accendere o spegnere l’amplicatore.
Viktigt
Tänk på följande när du gör anslutningar:
4Stäng av alla apparater i anläggningen innan du ansluter nya komponenter eller högtalare.
4Stäng av alla apparater i anläggningen innan du ändrar någon anslutning.
Du rekommenderas också:
4Vrida ner volymen på förförstärkaren helt och hållet innan förstärkaren slås på eller av.
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6RMB-1504 Four Channel Power Amplier
At Rotel, we are proud to do our part. We have reduced the lead content
in our products by using special lead-free ROHS solder and components.
Our engineers continually strive to improve power supply efciency without
compromise to quality. When in standby mode Rotel products use minimal
power to meet global Standby Power Consumption requirements.
The Rotel factory is also doing their part to help the environment through
constant improvements to product assembly methods for a cleaner and
greener manufacturing processes.
All of us at Rotel thank you for buying this product. We are sure it will bring
you many years of enjoyment.
Getting Started
Thank you for purchasing the Rotel RMB-1504 Four Channel Power Amplier.
When used in a high-quality music or home theater system, your Rotel
product will provide years of musical enjoyment.
The RMB-1504 is a sophisticated four-channel power amplier. Discrete
output devices, a massive power supply with toroidal transformer, premium
components, and Rotel’s Balanced Design ensure superb sound quality.
High current capability allows the RMB-1504 to drive difcult speaker
loads with ease.
Features
• Four-channel power amplier, with 70 watts per channel output into 8 ohms.
• Front panel input level controls.
• User-selectable power on/off conguration: 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 conguration 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
congurations 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 amplier.
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 ..........................................2
Figure 1: Controls and Connections 3
Figure 2: Analog Inputs and Speaker Output Connections 4
Important Notes 5
About Rotel .......................................................6
Getting Started ....................................................6
Features 6
A Few Precautions 6
Placement 7
AC Power and Control ...............................................7
AC Power Input -7
Power Switch and Power Indicator 17
Auto Turn On/Off Mode Selector 77
12 Volt Trigger Input 67
12 Volt Trigger Output 67
Circuit Breaker 07
Protection Circuitry 27
Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
RCA Inputs 48
Mono Switch 48
Linking the Inputs 48
Input Level Controls 38
Signal Output Link 58
Speaker Connection .................................................8
Speaker Selection 8
Speaker Wire Selection 8
Polarity and Phasing 8
Speaker Connection 89 8
Troubleshooting ....................................................9
Power Indicator Is Not Illuminated 9
No Sound 9
Protection Indicator 9
Specications......................................................9
About Rotel
Our story began over 50 years ago. Over the decades, we have received
hundreds of awards for our products and satised 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 amplier 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 airow
through the installation location, to prevent the amplier from overheating.
Remember the weight of the amplier 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 amplier is congured at the factory for the proper AC voltage in the
country where you purchased it, either 120 volts or 230 volts. The AC line
conguration 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 amplier 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 amplier and
all the other components connected to it.
Be sure the POWER SWITCH 1on the front panel of the amplier 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
amplier (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
amplier on, push the switch in. The ring around the switch will light up,
indicating that the amplier is turned on. To turn the amplier 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:
• With the switch in the OFF position, the amplier 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 amplier.
• With the switch in the SIGNAL SENSE position, the amplier turns on
automatically when a signal is detected at the inputs. The amplier 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 amplier,
regardless of whether or not a signal is present.
• With the switch in the 12V TRIG position, the amplier is turned on
automatically when a 12 volt trigger signal is present at the 12V TRIG
input to the left of the switch. The amplier 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 amplier, 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 amplier 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 amplier. 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 amplier’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 amplier if operating
conditions exceed safe limits.
Most likely, you will never see this protection circuitry in action. However,
should a faulty condition arise, the amplier will stop playing and one or
more of the PROTECTION LEDS on the front panel will light.
If this happens, turn the amplier off, let it cool down for several minutes,
and attempt to identify and correct the problem. There are independent

8RMB-1504 Four Channel Power Amplier
Signal Output Link 5
This pair of RCA connections can be used to pass the unprocessed input
signals to another audio component, for example to “daisychain” an additional
amplier 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 amplier 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 conguration, because the effective
impedance the amplier sees is cut in half. For example, when driving two
pair of 8 ohm speakers, the amplier 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 amplier 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 amplier 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 amplier connection.
Speaker Connections 89
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
amplier 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 amplier
back on, the protection circuit will automatically reset and the PROTECTION
LEDS should go out, indicating that the amplier 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 4
See Figure 2
There is one RCA input for each of the two pair of amplier channels. These
RCA inputs accept audio signals from preampliers or surround sound
processors. Use high quality audio interconnect cables for best performance.
For each pair of amplier 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 4
When the MONO switch is in the ON position, the “A” left channel input
is connected to the right channel.
Linking the Inputs 4
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 amplier channels with the same stereo input signals.
Input Level Controls 3
Two controls on the front panel, one for each pair of channels, provide
input level adjustments. These allow you to adjust the gain of the amplier
to match other components in the system. The A level control changes the
gain of the “A” channels; the B level control changes the “B” channels.
To adjust these controls, use a small, at blade screwdriver. Turn the control
clockwise to increase gain. Turn counterclockwise to reduce gain.

9
Specications
Continuous Power Output 4 x 70 watts/channel,
(20-20kHz, < 0.03%, 8 ohms) All channels dirven
Total Harmonic Distortion (20Hz-20kHz, 8 ohms)
Continuous rated power: < 0.03%
One-half rated power: < 0.03%
1 watt power: < 0.03%
Intermodulation Distortion (60Hz : 7kHz, 4:1) < 0.03%
Damping Factor (20-20kHz, 8 ohms) >200
Input Impedance/Sensitivity 20k Ohms/1.0 volt
Gain 26 dB
Input Overload Level 5.0 volt
Frequency Response (±1dB) 10 Hz - 100k Hz
Signal to Noise Ratio (IHF A) 115 dB
Crosstalk/Separation > 50 dB
Speaker Impedance 4 ohms minimum
Auto Turn On Level (with all inputs) 4 mV input signal
Power Requirements
U.S. version 120 Volts, 60Hz
European version 230 Volts, 50Hz
Power Consumption 300 Watts
Standby Power Consumption
Signal Sense 1 Watt
Standby: < 0.5 watts
BTU 810 BTU / h
Dimensions (W x H x D) 431 x 144 x 443 mm
17 x 5 2/3x 17 1/2ins.
Front Panel Height 3U / 132.6 mm / 5 2/9ins
Weight (net) 14.9 kg / 32.8 lbs.
All specifications are accurate at the time of printing.
Rotel reserves the right to make improvements without notice.
Rotel and the Rotel HiFi logo are registered trademarks of The Rotel Co, Ltd., Tokyo, Japan.
dual banana type connectors (except in the European Community countries
where their use is not permitted).
Route the wire from the amplier to the speakers. Give yourself enough slack
so you can move the components 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 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 the insulation from the end of each conductor. Be careful not to cut into
the wire strands. Unscrew (turn counterclockwise) the binding post. Place
the connector lug or wire around the binding post shaft. Turn the binding
post clockwise to clamp the connector lug or wire rmly in place.
NOTE: Be sure there are no loose wire strands that could touch adjacent
wires or connectors.
For each group of channels, connect the left speaker to the pair of speaker
connectors labeled LEFT. Connect the right speaker to the speaker connectors
labeled RIGHT. Follow the labels printed above the connectors, Make sure
that the positive terminal of the speaker is connected to the + terminal on the
amplier. Make sure that the negative terminal of the speaker is connected
to the – terminal of the amplier.
Troubleshooting
Most difculties in audio systems are the result of incorrect connections,
or improper control settings. If you encounter problems, isolate the area
of the difculty, check the control settings, determine the cause of the fault
and make the necessary changes. If you are unable to get sound from the
amplier, refer to the suggestions for the following conditions:
Power Indicator Is Not Illuminated
No main power to the RMB-1504. Check AC power connections at the
amplier and the AC outlet. Check the front panel power switch. Make sure
that it is set to the ON position. If using signal sensing auto power-on, make
sure that a signal is present at the inputs. If using 12V trigger power-on, make
sure that a trigger signal is present at rear panel 12V TRIG IN connector.
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 illuminated, see below. If not,
check all of your connections and control settings on associated components.
Protection Indicator
The front panel PROTECTION INDICATORS light when the RMB-1504
protection circuits have shut off the amplier. 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 amplier itself.

RMB-1504 Owner’s Manual Ver D 071619 English • Français • Deutsch • Español • Nederlands • Italiano • Svenska • Русский
The Rotel Co. Ltd.
Tachikawa Bldg. 1F.,
2-11-4, Nakane, Meguro-ku,
Tokyo, 152-0031
Japan
Rotel of America
54 Concord Street
North Reading, MA 01864-2699
USA
Phone: [phone]
Fax: [phone]
Rotel Europe
Dale Road
Worthing, West Sussex BN11 2BH
England
Phone: + 44 (0)1903 221 763
Fax: [phone]
Rotel Deutschland
Vertrieb: B&W Group Germany GmbH
Kleine Heide 12
D-33790 Halle/Westf., Deutschland
Phone: 05201 / 87170
Fax: 05201 / 73370
E-Mail: [email protected]
www.rotel-hi.de
www.rotel.com

FOUR CHANNEL POWER AMPLIFIER
RMB-1504
www.rotel.com
The RMB-1504 Class AB 4-channel amplier delivers 70 watts
per channel into 8 ohms and 115 watts into 4 ohm loads with
the ongoing commitment of performance without compromise
building on over 55 years of Rotel amplier engineering, design
and manufacturing experience. This amplier provides power
and renement for object based overhead speakers in home
theater installations and the demanding drive required for
custom installation and multi-room audio solutions.
The 12 volt trigger input and output connections, user
selected audio signal sense power control, front panel volume
attenuators, audio output link connections, 5-way speaker
binding posts and available rack mount kit provides ultimate
installation exibility.
12 volt trigger
input
Automatic signal
sensing
4 x 70 Watts of
robust power
Class AB amplier
design
An oversized factory built toroidal transformer and
high eiciency capacitors drive an array of high current
output transistors ensuring fast transient timing,
accurate detail and controlled consistency of low
frequency regardless of the loudspeakers load rating
or cable run distance. Maintaining crucial timing and
energy while delivering eortless power is a signature
trait of this amplier providing increased speaker
placement options.
Critical evaluation of the circuit design and meticulous
selection of each acoustic audio components ensures
accuracy, power and eiciency all coupled with an
unsurpassed build quality ensuring this amplier
proudly wears the Rotel name.

FOUR CHANNEL POWER AMPLIFIER
RMB-1504
www.rotel.com
Continuous Power Output 4 x 70 watts/channel,
(20-20kHz, < 0.03%, 8 ohms) All channel driven
Total Harmonic Distortion < 0.03%
(20Hz-20kHz, 8 ohms)
Intermodulation Distortion < 0.03%
(60 Hz : 7 kHz, 4:1)
Damping Factor (20-20kHz, 8 ohms) > 200
Input Impedance/Sensitivity 20k Ohms/1.0 Volt
Gain 26 dB
Input Overload Level 5.0 Volts
Frequency Response (±1dB) 10Hz - 100kHz
Signal to Noise Ratio (IHF A) 115 dB
Crosstalk / Separation >50 dB
Speaker Impedance 4 ohms minimum
Auto Turn On Level (with all inputs) 4 mV input signal
SPECIFICATIONS
Power Requirements
U.S. version 120 Volts, 60 Hz
European version 230 Volts, 50 Hz
Power Consumption 300 Watts
Standby Power Consumption
Signal Sense 1 Watt
Standby < 0.5 Watts
BTU 810 BTU/ h
Dimensions (W x H x D) 431 x 144 x 443 mm
17 x 52/3 x 171/2ins.
Front Panel Height 3U / 132.6mm / 53/4ins.
Weight (net) 14.9 kg / 32.8 lbs.
All specications are accurate at the time of printing.
Rotel reserves the right to make improvements without notice.

R □ TEL
Rotel 15 Series
Addendum
On-Off Power Button Masking Ring
Place this self adhesive ring over the light surrounding
the On/Off push button if the blue light is too bright .
Note importante
Masque pour l'eclairage peripherique du
bouton de mise sous tension On-Off
Placez cet anneau auto-adhesif sur la couronne
lumineuse du bouton de mise sous tension, si vous jugez
que cette lumiere bleue est trop brillante.
Nachtrag
Abdeckring fur den Ein-/ Aus-Schalter
Sollte Ihnen dos blaue Licht um den Ein-/ Aus-
Schalter zu hell sein, so decken Sie es mit diesem
selbstklebenden Ring ab .
Nota importante
Anillo de Atenuacion del Brillo del Testigo
Luminoso del Boton On/Off
Coloque este anillo autoadhesivo encima de la luz que
rodeo el pulsador de Puesta en Marcha/Desconexi6n en
caso de que la luz azul sea demasiado brillante.
Nota importante
Copertura led tasto On-Off
Posizionate questo adesivo attorno al tasto On / Off
per attenuare la luminosito della luce blu.
Aanvulling
Maskeringsring om de aan/uitschakelaar
Plak deze zelfklevende ring over de lichtgevende
cirkel rondom de aan/uittoets als u de blauwe
verlichting te fel vindt .
Tillagg
Maskeringsring for On/Off-knappen
Om du tycker att det bla ljuset cir for starkt kan du fasta
denna sjalvhaftande ring pa lysdioden som omger
On/Off -knappen.
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KHOnK1t1 BblKfltoYeH1t151 , ecn1t1 OHO Afl51 BOC Cfllt1UJK0M 51pK051.

.R . CAEL.:
RACK FRAME ASSEMBLY INSTRUCTIONS
STEP 1:
STEP 2:
• Remove the feet. • Attach rack frame to bottom, left
and right si des.
• Remove the screws from the Left and Right sides.
(1)
(1) (1) MACHINE FLAT SCREW V
~ QTY 4 PCS M4-6
(4) RACK FRAME (R)
(3) RACK FRAME (L)
(2) MACHINE BIND SCREW i
QTY:4 PCS M4-14
(1y(1) MACHI NE FLAT SCREW V
QTY: 4 PCS M4-6
(4) RACK FRAME (R)
(3) RACK FRAME (L) (2) MACHINE BIND SCREW i
QTY: 6 PCS M4-14
(1)
(1) MACHINE FLAT SCREW ';'
/ QTY: 4 PCS M4-6
(1)
(3) RACK FRAME (L)
(2) MACHINE BIND SCREW i
QTY: 6PCS M4-14
082 OMADD-RACK-A

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I~- TiEL:
Important Safety Instructions
English
These notes should be read with the owner's manual and its addendum and relates
to safety instructions.
Fran~ais
Ce livret doit etre lu conjointement avec le manuel utilisateur et ses supplements et
concerne remarques importantes concernant la securite.
Deutsch
Diese Anleitung sollte zusammen milder Bedienungsanleitung und dem Addendum
gelesen werden. Sie gilt fur wichtige Sicherheitshinweise.
Espanol
Estas notas deberian leerse junto con el manual de instrucciones y su anexo y
estan relacionadas con lnstrucciones importantes relacionadas con la seguridad.
Nederlands
Lees deze instructies in combinatie met de gebruikershandleiding en de aanvulling
daarop. Deze instructies betreffenBelangrijke veiligheidsaanwijzingen.
Italiano
Queste note sono parte integrante de l manuale di istruzioni dell' apparecchio e
sono relative all importanti informazion i di sicurezza.
Svenska
Denna information or ett tillagg till instruktionsboken och galler vi ktig
sakerhetsinformation.
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WARNING : SHOCK HAZARD-DO NOT OPEN
AVIS:RISOUE DE CHOC ELECTRIOUE-NE PAS OWRIR
1h
This symbol ls to alert the user to the
presence of uninsulated dangerous
voltages lnslde the product's enclosure
that may constitutea risk of eJectricshock.
&
This symbol is to alert the user to important
operating and maintenance (service)
instructions in this manual and literature
accompanying the product.
CAUTION, TO PREVENT ELECTRIC SHOCK.MATCH WIDE BLADE
OF PLUG TO WIDE SLOT. INSERT FULLY.
ATTENTION, POUR EVITER LES CHOCS ELECTRIQUES,
INTAODUIRE LA LAME LA PLUS LARGE DE LA FICHE
DANS LA BOANE CORRESPONDANTE DE LA PRISE ET
POUSSER JUSOU AU FOND.
)t
-
[]
Rotel products ore designed to comply with
internotionol directives on the Restriction of
Hazardous Substances (RoHS) in electrical ond
electronic equipment ond the disposal of Waste
Electrical ond Electronic Equipment (WEEE). The
crossed wheelie bin symbol indicates compliance ond
thot the products must be oppropriotely recycled
or processed in occordonce with these directives.
This symbol means that this unit is double insulated.
An earth connection is not required.
CE:
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 intothe enclosure, immediatelydisconnect
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 notblock any ventilation openings. Install in
accordancewith 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 polarizedplug has two bladeswith 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 exitfrom
the apparatus.
Only use attachments/accessories specified by
the manufacturer.
Use only with the cart, stand, a
tripod, bracket, or table specified ,
by the maAufacturer, 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 thisapparatusduring 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 Rome sources, such as lighted candles,
should be placed on the apparatus.
English
You must allow a minimum lO cm or 4 inches
of unobstructed clearance around the unit.
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WARNING: The rear panel power cord
connector is themains power disconnectdevice.
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 thetype and voltagespecified on therear
panel. (USA: 120 V /60Hz, EC: 230V /50Hz)
Connect the component to the power outlet
only with the supplied power supply cable or
an exactequivalent. Do not modifythesupplied
cable. Do not use extension cords.
The mains plug is the disconnect of the unit. In
order to completelydisconnectthe 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.

R □ TEL:
The Rotel Co. Ltd.
Tachikawa Bldg. 1 F.,
2-11-4, Nakane, Meguro-ku,
Tokyo, 152-0031
Japan
Rotel of America
54 Concord Street
North Reading, MA 01864-2699
USA
- Phone: + l 978-664-3820
Fax: [phone]
Rotel Europe
Dale Road
Worthing, West Sussex BN 11 2BH
England
Phone: + 44 (0) 1903 221 763
Fax: [phone]
. '!
r L,;
Rotel Deutschland
Vertrieb: B&W Group Germany GmbH
Kleine Heide 12
D-33790 Halle/Westf., Deutschland
Tel.: 05201 / 87170
Fax: 05201 I 73370
q,OO#'t~
~rlfi*f.lGIK#'t{fltl,-=fl'fll&~'B'J
ffilhl: 9'1 m1*!ti~1firm~tfit*ffl.IK~27 %IK~
iti, -m: 0756-8817222
f~~: 0756-8936222
www.rotel.com
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082 OMADDRMB-1504 - SI-B 061719 English• Franc;:a is • Deutsch • Espanol • Nederlands • Italiano • Svenska • PyccK~lil• If')(
~

Register Today
Please take a moment and register your Rotel product on our
website: http://www .rotel.com/product-registration. If your Rotel
product needs service the registration information can help expedite
the repair process. You may also request to be included in future
product information emails, if desired. Please note your information
will not be provided to any third parties or used for unauthorized
marketing activities.
You may also register your product by scanning the QR code below
and completing the registration information:
ROTELUSA
54 Co ncord Street
North Reading, MA 0l 864- 2699
USA
Phone : 978 - 664 - 3820
Fax : [phone]l 09
www.rotel.com
ROTELCANADA
902 McKay Rd .,
Su i te 4 Pickering, Ontario Ll W 3X8
CANADA
Phone: (905) 428 - 2800
(800) 667 - 6065
Fax: (905) 428 - 0004
R □ TEL
WARRANTY CARD
R □ TEL
0 I I 0
00
000 00000
0 I I
R □ TEL
0
0 0 I I
0
000000
D
00 000000
0-0-0-0

North American Limited Warranty
This product ha s a warranty aga inst faulty mater i al and work m ansh ip
when used in normal domestic operation for the purpose for which it
was designed and is subject to the following conditions:
The product is acquired from an autho r ized Rotel North Amer i ca n dealer and the online
registration is completed within 30 days from date of purchase.
2 Any claim arising out of this warranty should be made either directly to the authorized
dealer from whom the equipment was purchased, contacting Rotel or taken to an
authorized service center. If choosing to send product to Rotel for a warranty claim, a
service ticket must be obtained in advance by contacting Rote! directly. As a condition
of Rotel's obligat i on to honor the terms of the warranty , a copy of your invoice or bill of
sale from the authori zed Rote! selling dealer must be supplied when request ing service.
3 ( a) In the event of warranty service being required from Rote! the equipment mus t be
securely packed and dispatched to Rotel's service center or the nearest authorized
service depot , prepaid and if desired, insured by the owner .
(b) Defective component parts (excluding fuses) will be replaced free of cha r ge and the
equipment returned freight paid .
4 This warranty expressly excludes:
a) Damage c aused by inc o rr ect use of the apparatus.
b) Loss or damage in transit in either direction.
c) Contingent and third party liability.
5 Any service modi fi cation or alteration carried out by any person other than the authorized
representative of Rotel or their appointed agents renders this warranty invalid.
6 No alteration or variation of the warranty will be recognized.
7 This warranty is not transferable.
_____ .L
WARRANTY PERIOD
MODEL PARTS LABOUR
I NTE GR AT ED AM PLIF I ER S S YEARS S YE ARS
PRE AMP LIFI ERS S Y EAR S S YE ARS
PO WER AMPLIFIER S S YEARS S YE ARS
MU LT I ROO M AMPLIFIE R S YEARS S YEARS
RECE IVE RS S YEARS S YE ARS
TUN ER S S YEARS S YE ARS
COMP ACT DI SC PLAY E RS 2 YEARS 2 YEARS
Garantie limitee pour I' Amerique du Nord
Ce produit possede une garantie co nt re les defauts de fabr i cat ion sur
les pieces et la ma i n-d ' oeuvre lorsqu' ut ilise a la maison aux fins pour
lesquelles ii a ete con~u sous reserve des conditions suivantes:
Le produit a ete ach e te aupres d' un detaillantautar ise Rotel d' Ame ri que duNord etfaire
!'inscription en ligne dons les 30 j our s suivant l' acha t.
2 Toute re clamation emanant de cette garantie do it etre faite directement aup res de Rote l
OU au detaillant autorise OU l'equipement a ete achete. Yous po uvez contacter Rote l
ou apporte votre equipement dons un centre de service autorise. Si vous choisissez
d'envoyer un produit a Rote l pour une demande de garan t ie , vo us de v ez ob tenir un bo n
de service en contactant directement Rote l. Comme c ond ition de l'appli cation de cette
garantie par Ro tel, une copie de la facture d' acha t em is e par le de taill ant autorise Rotel
doit etre jointe au produit au moment ou la deman de de se rvice sera effectuee.
3 a) Dans le cos ou un service couvert par la garantie est demande aup res de Rotel,
(a ppareil do it otre soigneusement emba ll e et ex ped ie a un centre de se rv ice Rote l
OU a un centre de service autori se par envoie prepaye et, si desire, assure p ar le
proprietaire.
b) Les pieces defectueuses (a !'exception de s f us ible s) seront remplacees sans frais et
l' appareil s era retourne par envoie prepaye .
4 Cette garan tie exclut expressement:
a) Les do mmages cau sespar un us age i nco rrec t de l'appareil.
b) La perte ou l es dommages en cours de route dons l'une ou l'autre direction.
c) La responsabilite fortuite ou d'un tiers.
5 Tout service, toute modification ou tout changement execute par une personne aut re que
le representant au torise de Rotel ou s es ag e nts autoris es rend cette gar antie nulle et non
avenue.
6 Aucun changement ou variation de cette garantie ne sera reconnu.
7 Cette garant ie est non transferable.
DUREE DE LA GARANTIE
PRODUIT
PIECES MAIN D' OEUVRE
AM P LIFICAT EU RS I NT EGR ES SANS SANS
P RE AMPLIFICAT E URS SANS SANS
AMPLIFICATEURS DE P UISSANC E
SANS SANS
AMP LIFICATEURS MULT I- PIECES SANS SANS
RE CEPTEURS SANS SANS
SYNTONISATEURS SANS SANS
LEC T EURS DE DISQUES COMPACTS 2 ANS 2ANS
0824TR-3043D-07 WARRAN TY CARD { RAA }_ 0228l9