Rotel Power Supply RB 1080 User Guide

Owner’s Manual  
Manuel d’utilisation  
Bedienungsanleitung  
Manuale di Istruzioni  
Manual de Instrucciones  
Gebruiksaanwijzing  
RB-1080  
Stereo Power Amplifier  
Amplificateur De Puissance Stéréo  
Stereo-Endstufe  
Finale di Potenza Stereo  
Etapa de Potencia Estereofónica  
Stereo Eindversterker  
POWER AMPLIFIER  
RB-1080  
BRIDGED MONO  
PROTECTION  
POWER  
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3
English  
Figure 1: Controls and Connections  
Commandes et branchements  
Bedienelemente und Anschlüsse  
Controlli e collegamenti  
Controles y Conexiones  
De bedieningsorganen en aansluitingen  
POWER AMPLIFIER  
RB-1080  
BRIDGED MONO  
PROTECTION  
POWER  
1
2
3
4
5
6
8
9
10 11  
6
5
ON  
RIGHT INPUT  
BALANCED  
LEFT INPUT  
BALANCED  
POWER AMPLIFIER  
MODEL NO. RB-1080  
POWER CONSUMPTION: 550W  
IN  
OUT  
OFF  
UNBALANCED  
UNBALANCED  
12V TRIGGER  
BALANCED  
UNBALANCED  
AC FUSE  
125V 12A  
SPEAKER IMPEDANCE  
4 OHMS MINIMUM  
RIGHT SPEAKER  
LEFT SPEAKER  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
CAUTION DISCONNECT  
REPLACING FUSE. REPLACE  
WITH SAME TYPE FUSE.  
SUPPLY CORD BEFORE  
WARNING:WARNING SHOCK HAZARD  
AVIS: RISQUE DE CHOC ELECTRIQUE–NE PAS OUVRIR  
DO NOT OPEN  
ATTENTION  
DEBRANCHER  
AVANT DE REMPLACER LE  
FUSIBLE.  
UTILISER UN FUSIBLE DE  
RECHANGE DE MÊME TYPE.  
Manufactued under license from  
Lucasfilm Ltd. Lucasfilm and THX  
are registered trademarks of  
Lucasfilm Ltd.  
WARNING:TO REDUCE THE RISK  
OF FIRE OR ELECTRICAL SHOCK,  
DO NOT EXPOSE THIS EQUIPMENT  
TO RAIN OR MOISTURE.  
SERIAL NO.  
7
7
12  
13  
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4
RB-1080 Stereo Power Amplifier  
Figure 2: Stereo Connections  
Branchement des entrées et des enceintes en stéréo  
Anschlußdiagramm bei Stereobetrieb  
Collegamenti stereo - Ingressi e diffusori  
Conexión de la señal de entrada y las cajas acústicas  
De cinch- en luidsprekerverbindingen  
PREAMPLIFIER  
PREAMP OUTPUTS  
L
R
ROTEL RB-1080  
ON  
RIGHT INPUT  
LEFT INPUT  
BALANCED  
BALANCED  
POWER AMPLIFIER  
MODEL NO. RB-1080  
POWER CONSUMPTION: 550W  
IN  
OUT  
OFF  
UNBALANCED  
UNBALANCED  
12V TRIGGER  
BALANCED  
UNBALANCED  
AC FUSE  
125V 12A  
SPEAKER IMPEDANCE  
RIGHT SPEAKER  
LEFT SPEAKER  
CAUTION  
4
OHMS MINIMUM  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
CAUTION DISCONNECT  
REPLACING FUSE. REPLACE  
WITH SAME TYPE FUSE.  
SUPPLY CORD BEFORE  
WARNING:WARNING SHOCK HAZARD  
AVIS: RISQUE DE CHOC ELECTRIQUE–NE PAS OUVRIR  
DO NOT OPEN  
ATTENTION  
DEBRANCHER  
AVANT DE REMPLACER LE  
FUSIBLE.  
UTILISER UN FUSIBLE DE  
RECHANGE DE MÊME TYPE.  
WARNING:TO REDUCE THE RISK  
OF FIRE OR ELECTRICAL SHOCK,  
DO NOT EXPOSE THIS EQUIPMENT  
TO RAIN OR MOISTURE.  
Manufactued under license from  
Lucasfilm Ltd. Lucasfilm and THX  
are registered trademarks of  
Lucasfilm Ltd.  
SERIAL NO.  
Figure 3: Balanced Inputs Connection  
Branchement des entrées symétriques  
Anschlußdiagramm (Symmetrische Eingänge)  
Collegamento ingressi bilanciati  
Entradas Balanceadas  
De gebalanceerde ingangen  
PREAMPLIFIER  
PREAMP OUTPUTS  
R
L
ROTEL RB-1080  
ON  
RIGHT INPUT  
LEFT INPUT  
BALANCED  
BALANCED  
POWER AMPLIFIER  
MODEL NO. RB-1080  
POWER CONSUMPTION: 550W  
IN  
OUT  
OFF  
UNBALANCED  
UNBALANCED  
12V TRIGGER  
BALANCED  
UNBALANCED  
AC FUSE  
125V 12A  
SPEAKER IMPEDANCE  
RIGHT SPEAKER  
LEFT SPEAKER  
CAUTION  
4
OHMS MINIMUM  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
CAUTION DISCONNECT  
REPLACING FUSE. REPLACE  
WITH SAME TYPE FUSE.  
SUPPLY CORD BEFORE  
WARNING:WARNING SHOCK HAZARD  
AVIS: RISQUE DE CHOC ELECTRIQUE–NE PAS OUVRIR  
DO NOT OPEN  
ATTENTION  
DEBRANCHER  
AVANT DE REMPLACER LE  
FUSIBLE.  
UTILISER UN FUSIBLE DE  
RECHANGE DE MÊME TYPE.  
WARNING:TO REDUCE THE RISK  
OF FIRE OR ELECTRICAL SHOCK,  
DO NOT EXPOSE THIS EQUIPMENT  
TO RAIN OR MOISTURE.  
Manufactued under license from  
Lucasfilm Ltd. Lucasfilm and THX  
are registered trademarks of  
Lucasfilm Ltd.  
SERIAL NO.  
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5
English  
The RB-1080 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 Rotel’s Balanced Design ensure superb  
sound quality. High current capability allows  
the RB-991 to drive the most demanding loud-  
speakers.  
Contents  
Figure 1: Controls and Connections  
About Rotel  
3
4
4
A family whose passionate interest in music  
led them to manufacture high fidelity compo-  
nents of uncompromising quality founded Rotel  
over 40 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 employ-  
ees.  
Figure 2: Stereo Connections  
Figure 4: Balanced Input Connection  
Contents ............................................... 5  
About Rotel .......................................... 5  
Getting Started ..................................... 5  
Be aware that the RB-1080 is capable of high  
power levels, in excess of 200 watts per chan-  
nel. Make sure that your speakers can handle  
the power of the RB-1080. If in doubt about  
your speakers, ask your local Rotel audio  
retailer for advice.  
The engineers work as a close team, listen-  
ing 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 ca-  
pacitors from the United Kingdom and Ger-  
many, semi conductors from Japan or the  
United States, while toroidal power transform-  
ers are manufactured in Rotels own factory.  
A Few Precautions  
Placement  
5
6
The RB-1080 is straightforward in its instal-  
lation and operation. If you have experience  
with other stereo power amplifiers, you  
shouldn’t find anything perplexing. Plug in a  
pair of high-quality RCA cables from your  
preamp into the amplifier inputs, wire up your  
speakers, and enjoy. Alternatively, the RB-1080  
provides an optional pair of balanced inputs  
for use with preamps or processors that of-  
fer these low-noise XLR-connections. If you  
choose this option, you will need to reset a  
back panel switch selecting the balanced in-  
puts. Again, nothing very confusing.  
AC Power and Control ........................... 6  
AC Power Input  
Power Switch  
6
6
6
6
6
and Power Indicator  
Trigger ON/OFF Mode Selector  
12V Trigger Input  
Protection Circuitry  
and Output  
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 musi-  
cal, reliable and affordable.  
Input Signal Connections ........................ 7  
Input Selector Switch  
RCA Inputs (unbalanced)  
XLR Inputs (balanced)  
7
7
7
A Few Precautions  
All of us at Rotel thank you for buying this  
product and hope it will bring you many hours  
of enjoyment.  
Please read this manual carefully. In addition  
to basic installation and operating instructions,  
it provides valuable information on various  
RB-1080 system configurations as well as gen-  
eral information that will help you get opti-  
mum performance from your system. Please  
contact your authorized Rotel audio retailer  
for answers to any questions you might have.  
In addition, all of us at Rotel welcome your  
questions and comments.  
Speaker Connection ............................... 7  
Speaker Selection  
7
7
7
7
Speaker Wire Selection  
Polarity and Phasing  
Speaker Connection  
Getting Started  
Thank you for purchasing the Rotel RB-1080  
Stereo Power Amplifier. When used in a high-  
quality music or home theater system, your  
Rotel amplifier will provide years of musical  
enjoyment.  
Troubleshooting ..................................... 8  
Front Panel Power Indicator Is Not Lit  
Fuse Replacement  
8
8
8
8
Save the RB-1080 shipping carton and all en-  
closed packing material for future use. Ship-  
ping or moving the RB-1080 in anything other  
than the original packing material may re-  
sult in severe damage to your amplifier.  
No Sound  
Protection Indicator Is Lit  
Specifications ........................................ 8  
Fill out and send in the owner’s registration  
card packed with the RB-1080. 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.  
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6
RB-1080 Stereo Power Amplifier  
Placement  
12V Trigger Input  
and Output  
Note: Should you move your RB-1080  
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-1080 exposes you  
to dangerous voltages. Consult a qualified  
service person or the Rotel factory service  
department for information.  
The RB-1080 generates heat as part of its nor-  
mal 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 chas-  
sis, and reasonable airflow through the in-  
stallation location, to prevent the amplifier from  
overheating.  
The jack labeled IN is for connecting the  
3.5mm Plug/Cable carrying a +12 volt trig-  
ger 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.  
If you are going to be away from home for  
an extended period of time such as a month-  
long vacation, it is a sensible precaution to  
unplug your amplifier (as well as other au-  
dio and video components) while you are  
away.  
The jack labeled OUT is for connecting an-  
other 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.  
Likewise, remember the weight of the ampli-  
fier when you select an installation location.  
Make sure that the shelf or cabinet can sup-  
port its considerable bulk. Again, use com-  
mon sense.  
Protection Circuitry  
Power Switch  
Indicator  
and Power  
The RB-1080 features a thermal protection cir-  
cuit that protects the amplifier against potential  
damage in the event of extreme or faulty  
operating conditions. Unlike many designs,  
the RB-108 0s protection circuit is indepen-  
dent 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 tem-  
peratures exceed safe limits.  
AC Power and Control  
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 po-  
sition.  
AC Power Input  
Because of its high power rating, the RB-1080  
can draw considerable current. Therefore, it  
should be plugged directly into a 2-pin po-  
larized 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-1080 and all the other components con-  
nected to it.  
Trigger ON/OFF  
Mode Selector  
Most likely, you will never see this protection  
circuitry in action. However, should a faulty  
condition arise, the amplifier will stop play-  
ing and the LED indicator on the front panel  
will light up.  
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.  
Be sure the Power Switch on the front panel  
of the RMB-1095 is turned off (in the out po-  
sition). Then, connect the supplied power cord  
If this happens, turn the amplifier off, let it cool  
down for several minutes, and attempt to iden-  
tify 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.  
to the Power Connector  
on the back panel  
With the switch in the +12V TRIGGER ON  
position, the amplifier is turned on automati-  
cally 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.  
of the amplifier and to the AC power outlet.  
Your RB-1080 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.  
In most cases, the protection circuitry activates  
because of a fault condition such as shorted  
speaker wires, or inadequate ventilation lead-  
ing to an overheating condition. In very rare  
cases, highly reactive or extremely low im-  
pedance speaker loads could cause the pro-  
tection 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.  
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7
English  
Speaker Connection  
Input Signal Connections  
Speaker Connection  
The RB-1080 has two pairs of color coded  
binding posts on the back panel. These con-  
nectors accept bare wire, connector lugs, or  
dual banana type connectors (except in the  
European Community countries where their  
use is not permitted).  
The RB-1080 gives you a choice of two dif-  
ferent kinds of input connections – conven-  
tional unbalanced RCA type connections (such  
as found on nearly all audio equipment) or  
balanced XLR-type connections for use with  
some high-end preamps or digital processors  
featuring this lower noise connection.  
Speaker Selection  
We recommend using loudspeakers with a  
nominal impedance of 4 ohms or higher with  
the RB-1080. You should exercise some cau-  
tion in driving multiple pairs of speakers in  
parallel configuration, because the effective  
impedance the amplifier sees is cut in half.  
For example, when driving two pair of 8 ohm  
speakers, the 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-1080. See  
your authorized Rotel dealer if you have any  
questions.  
Route the wire from the RB-1080 to the speak-  
ers. Give yourself enough slack so you can  
move the components enough to allow access  
to the speaker connectors.  
NOTE: To prevent loud potentially damag-  
ing noises, make sure the amplifier is  
turned off when you make any changes to  
the input signal configuration.  
If you are using dual banana plugs, connect  
them to the wires and then plug into the backs  
of the binding posts. The hexagonal thumb-  
screws of the binding posts should be screwed  
in all the way (clockwise).  
Input Selector Switch  
Set the switch select the inputs that are being  
used. Set it to Unbalanced if the RCA inputs  
are used. Set it to Balanced if the XLR inputs  
are used.  
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 coun-  
terclockwise) the binding post hexagonal  
thumbscrews. Place the connector lug or wire  
around the binding post shaft. Turn the hex-  
agonal thumbscrews clockwise to clamp the  
connector lug or wire firmly in place.  
Speaker Wire Selection  
RCA Inputs (unbalanced)  
Use insulated two-conductor stranded wire to  
connect the RB-1080 to the speakers. The size  
and quality of the wire can have an audible  
effect on the performance of the system. Stan-  
dard 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 spe-  
cial high-quality speaker cables. Your autho-  
rized Rotel dealer can help in the selection  
of appropriate cables for your system.  
See Figure 2  
When a component with RCA connectors –  
such as a preamplifier or surround sound pro-  
cessor – supplies signals to the RB-1080, the  
RCA-type phono plug inputs should be used.  
Note: Be sure there are no loose wire  
strands that could touch adjacent wires or  
connectors.  
Select high quality audio interconnect cables.  
Connect each of the outputs from the pream-  
plifier or signal processor to the correspond-  
ing Unbalanced Input of the RB-1080.  
XLR Inputs (balanced)  
Polarity and Phasing  
See Figure 3  
The polarity — the positive/negative orien-  
tation of the connections — for every speaker  
and amplifier connection must be consistent  
so all the speakers will be in phase. If the po-  
larity of one connection is mistakenly reversed,  
bass output will be very weak and stereo im-  
aging 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 insula-  
tion 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.  
If you are using one of the high-end pream-  
plifiers or processors with low-noise balanced  
signal outputs to drive your RB-1080, you may  
choose to use these low-noise XLR-type con-  
nections. See your authorized Rotel dealer for  
the appropriate cables.  
Connect XLR audio interconnect cables from  
each of the outputs from the preamplifier or  
signal processor to the corresponding Bal-  
anced Input of the RB-1080.  
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8
RB-1080 Stereo Power Amplifier  
No Sound  
Troubleshooting  
If the amp is getting AC power, but is pro-  
ducing no sound, check the Protection indi-  
cator on the front panel. If it is lit, see below.  
If not, check all of your connections and control  
settings on associated components. Check the  
input selector switch on the RB-1080 back  
panel to be sure that its setting matches the  
type of input you are using.  
Most difficulties in audio systems are the re-  
sult of poor or wrong connections, or improper  
control settings. If you encounter problems,  
isolate the area of the difficulty, check the con-  
trol settings, determine the cause of the fault  
and make the necessary changes. If you are  
unable to get sound from the RB-1080, refer  
to the suggestions for the following conditions:  
Protection Indicator Is Lit  
Front Panel Power Indicator  
Is Not Lit  
The front panel indicator lights when the  
RB-1080 protection circuits have shut off the  
amplifier. Typically, this occurs only when the  
ventilation openings are blocked, when there  
is faulty speaker wiring, or after a period of  
extreme use. Turn off the system and wait for  
the amp to cool. Then push the front panel  
power switch in and out to reset the protec-  
tion devices. If the problem is not corrected  
or reoccurs, there is a problem with the sys-  
tem or the amplifier itself.  
No main power to the RB-1080. Check the  
front panel power switch. Make sure that it  
is set to the on position. Check AC power con-  
nections at the amplifier and the AC outlet.  
Fuse Replacement  
If everything checks out correctly and you still  
cannot get the amplifier to turn on, check for  
a blown fuse. Disconnect the AC from the wall  
and remove the fuse holder  
on the back  
panel. If the fuse is blown, replace with a new  
fuse and try again.  
Note: Make sure that the power cord is  
disconnected from the wall before checking  
or replacing the fuse. Replace only with the  
identical size and type fuse (10 amp  
AGC).  
Specifications  
Continuous Power Output (20-20 kHz, < 0.03%)  
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  
200 watts/ch into 8 ohms  
< 0.03%  
< 0.03%  
15Hz-100kHz  
1000  
4 ohms minimum  
116 dB  
Signal to Noise Ratio (IHF A network)  
Input Impedance/Sensitivity  
32 k Ohms/1.5volt  
Power Requirements  
115 Volts, 60 Hz (U.S. version)  
230 Volts, 50 Hz (European version)  
Power Consumption  
5500 Watts  
Dimensions (W x H x D)  
430 x 121 x 385 mm  
173/8 x 43/4 x 153/16 in  
Weight (net)  
15.5 kg, 34.1 lb.  
All specifications are accurate at the time of printing.  
Rotel reserves the right to make improvements without notice.  
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