Rotel Stereo Amplifier RB 1050 User Guide

Owner’s Manual  
Manuel d’utilisation  
Bedienungsanleitung  
Manuale di Istruzioni  
Manual de Instrucciones  
Gebruiksaanwijzing  
RB-1050  
Stereo Power Amplifier  
Amplificateur De Puissance Stéréo  
Stereo-Endstufe  
Amplificatore di Potenza  
Etapa de Potencia Estereofónica  
Stereo Eindversterker  
POWER AMPLIFIER RB1050  
CH-1 CH-2  
CLIPPING PROTECTION CLIPPING  
POWER  
 
3
English  
Figure 1: Controls and Connections  
Commandes et branchements  
Bedienelemente und Anschlüsse  
Controlli e collegamenti  
Controles y Conexiones  
De bedieningsorganen en aansluitingen  
4
5
4
POWER AMPLIFIER RB-1050  
CH-1  
CH-2  
CLIPPING PROTECTION CLIPPING  
POWER  
3
1
2
3
10A  
SPEAKER IMPEDANCE  
4 OHMS MINIMUM  
12V TRIGGER  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
12V TRIG.  
OFF  
WARNING:SHOCK HAZZARD–DO NOT OPEN  
AC BREAKER  
SPEAKERS  
OUT  
IN  
SIGNAL SENSE  
CH 1  
CHANNEL 2  
RIGHT  
CHANNEL 1  
LEFT  
INPUT  
CH 2 CH 1  
CH 2  
WARNING: TO REDUCE THE RISK  
OF FIRE OR ELECTRICAL SHOCK,  
DO NOT EXPOSE THIS EQUIPMENT  
TO RAIN OR MOISTURE.  
POWER AMPLIFIER  
MODEL NO. RB-1050  
POWER CONSUMPTION: 250W  
SIGNAL OUTPUT  
LINK  
SERIAL NO.  
6
7
8
9
10  
11  
12  
Figure 2: Preamp Input and Speaker Output Connections  
Entrée préamplificateur et sorties enceintes acoustiques  
Anschlußdiagramm (Cinch-Eingänge und Lautsprecher)  
Collegamenti di ingresso dal preamplificatore e delle uscite dei diffusori  
Conexiones para la Señal de Entrada y Salidas para la Conexión de las Cajas  
De aansluitingen naar de voorversterker en luidsprekerverbindingen  
PREAMPLIFIER  
PREAMP OUTPUTS  
L
R
SPEAKER  
SPEAKER  
ROTEL RB-1050  
10A  
SPEAKER IMPEDANCE  
OHMS MINIMUM  
12V TRIGGER  
12V TRIG.  
CAUTION  
4
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
OFF  
WARNING:SHOCK HAZZARD–DO NOT OPEN  
AC BREAKER  
SPEAKERS  
OUT  
IN  
SIGNAL SENSE  
CH  
CHANNEL  
RIGHT  
2
CHANNEL  
LEFT  
1
INPUT  
CH  
CH  
2
1
CH  
2
1
WARNING: TO REDUCE THE RISK  
OF FIRE OR ELECTRICAL SHOCK,  
DO NOT EXPOSE THIS EQUIPMENT  
TO RAIN OR MOISTURE.  
POWER AMPLIFIER  
MODEL NO. RB-1050  
POWER CONSUMPTION: 250W  
SIGNAL OUTPUT  
LINK  
SERIAL NO.  
 
4
RB-1050 Stereo Power Amplifier  
Be aware that the RB-1050 is capable of high  
power levels, in excess of 70 watts per channel.  
Make sure that your speakers can handle the  
power of the RB-1050. If in doubt about your  
speakers, ask your local Rotel audio dealer  
for advice.  
Contents  
Figure 1: Controls and Connections  
Figure 2: Preamp Input and Speaker  
Output Connections  
About Rotel  
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3
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.  
The RB-1050 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.  
About Rotel .......................................... 4  
Getting Started ..................................... 4  
A Few Precautions  
Placement  
4
4
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.  
AC Power and Control ........................... 5  
A Few Precautions  
AC Power Input  
Power Switch  
5
5
5
5
5
5
5
Please read this manual carefully. In addition  
to basic installation and operating instructions,  
it provides valuable information on various  
RB-1050 system configurations as well as gen-  
eral information that will help you get opti-  
mum performance from your system. Please  
contact your authorized Rotel dealer for an-  
swers to any questions you might have. In ad-  
dition, all of us at Rotel welcome your ques-  
tions and comments.  
and Power Indicator  
12V Trigger Mode Selector  
12V Trigger Input and Output  
Circuit Breakers  
Protection Circuitry  
Clipping Indicators  
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  
.................. 6  
Front Panel Level Controls  
6
6
Save the RB-1050 shipping carton and all en-  
closed packing material for future use. Ship-  
ping or moving the RB-1050 in anything other  
than the original packing material may re-  
sult in severe damage to your amplifier.  
“Signal Output Link” Connectors  
Speaker Connection ............................... 6  
All of us at Rotel thank you for buying this  
product and hope it will bring you many hours  
of enjoyment.  
Speaker Selection  
6
6
6
6
Fill out and send in the owner’s registration  
card packed with the RB-1050. 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.  
Speaker Wire Selection  
Polarity and Phasing  
Speaker Connection  
Getting Started  
Troubleshooting ..................................... 7  
Thank you for purchasing the Rotel RB-1050  
Stereo Power Amplifier. When used in a high-  
quality music or home theater system, your  
Rotel amplifier will provide years of musical  
enjoyment.  
Front Panel Power Indicator Is Not Lit  
No Sound  
7
7
7
Placement  
The RB-1050 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.  
Protection Indicator Is Lit  
Specifications ........................................ 7  
The RB-1050 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-1050 to drive the most demanding loud-  
speakers.  
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.  
 
5
English  
12V Trigger Mode Selector  
Protection Circuitry  
AC Power and Control  
The Amplifier provides the option for manual  
or automatic power on/off operation. These  
modes are selectable using a switch on the  
back panel.  
The RB-1050 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-1050s 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 Input  
Because of its high power rating, the RB-1050  
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-1050 and all the other components con-  
nected to it.  
NOTE: The front panel Power Switch  
must be ON for the automatic turn on sys-  
tem to work.  
When the switch is in the “12V TRIG” posi-  
tion, 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 af-  
ter a delay of 5 minutes if the +12V signal is  
not present.  
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.  
Be sure the Power Switch on the front panel  
of the RB-1050 is turned off (in the out posi-  
tion). Then, connect the supplied power cord  
to the Power Connector  
of the amplifier and to the AC power outlet.  
on the back panel  
When the switch is in the “SIGNAL SENSE”  
position the amplfier is turned on whenever  
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.  
an audio signal is applied to the Inputs  
.
Your RB-1050 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.  
If no audio signal is applied to the inputs the  
amplifier will return to standby mode after a  
delay of 5 minutes.  
When the switch is in the “OFF” position the  
automatic activation system is turned off. Only  
the front panel Power Switch will control the  
amplifier.  
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.  
Note: Should you move your RB-1050  
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-1050 exposes you  
to dangerous voltages. Consult a qualified  
service person or the Rotel factory service  
department for information.  
12V Trigger Input  
and Output  
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 front panel Power Switch  
must be set to the ON position. This input ac-  
cepts any control signal (AC or DC) ranging  
from 3 volts to 30 volts.  
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.  
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.  
Clipping Indicators  
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.  
Each channel has a Clipping Indicator on the  
front panel. “Clippping” occurs when an am-  
plifier it driven to the point it begins to pro-  
duce distortion. The term refers to the flattening  
or “clipping” of the musical waveform that  
occurs when an amplifier is driven beyond  
its rated power. If the Clipping Indicators light,  
reduce the volume level of the system. Fail-  
ure to so do could result in damage to the  
speakers connected to the amplifier. It may  
also cause the Protection Circuit to activate.  
Power Switch  
Indicator  
and Power  
Circuit Breaker  
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.  
A circuit breaker on the rear panel protects  
the amplifier’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.  
 
6
RB-1050 Stereo Power Amplifier  
Speaker Connection  
Input Signal Connections  
Speaker Connection  
The RB-1050 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).  
See Figure 2  
Speaker Selection  
The RB-1050 has conventional RCA type in-  
put connectors, the type found on nearly all  
audio equipment.  
We recommend using loudspeakers with a  
nominal impedance of 4 ohms or higher with  
the RB-1050. 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-1050. See  
your authorized Rotel dealer if you have any  
questions.  
Route the wire from the RB-1050 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).  
Select high quality audio interconnect cables.  
Connect each of the outputs from the pream-  
plifier or signal processor to the correspond-  
ing input of the RB-1050. Typically the left  
channel signal is connected to Channel 1 and  
the right channel signal is connected to Chan-  
nel 2.  
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.  
Front Panel Level Controls  
Speaker Wire Selection  
The Level controls on the front panel let you  
control the output volume of the RB-1050. In  
most systems these controls should be turned  
up all the way (full clockwise position). In some  
situations, such as when the amplifier is part  
of a multi-room or bi-amplified speaker sys-  
tem, it may be necessary to reduce the out-  
put level. Use a small flat blade screwdriver  
to turn the controls down (counterclockwise)  
as needed.  
Use insulated two-conductor stranded wire to  
connect the RB-1050 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.  
NOTE: Be sure there are no loose wire  
strands that could touch adjacent wires or  
connectors.  
Turning down the level does not reduce the  
maximum output of the amplifier. It simply  
increases the input signal required to achieve  
maximum output power.  
Polarity and Phasing  
“Signal Output Link”  
Connectors  
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.  
The input signal that is goes into the normal  
Inputs also goes to the Signal Output Link  
connectors. This is typically used when the  
amplifier is part of a multi-room system. The  
signal from the Signal Output Link is then used  
to provide a signal to the other amplifiers in  
the system.  
 
7
English  
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.  
Also check the front panel Level Controls to  
see if they are turned up. Then check all of  
your connections and control settings on as-  
sociated components.  
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-1050, refer  
to the suggestions for the following conditions:  
Protection Indicator Is Lit  
The front panel indicator lights when the  
RB-1050 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.  
Front Panel Power Indicator  
Is Not Lit  
No main power to the RB-1050. 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.  
Specifications  
Continuous Power Output  
70 watts/ch  
(20-20 kHz, < 0.03%, 8 ohms)  
Total Harmonic Distortion (20Hz-20kHz, 8 ohms)  
Intermodulation Distortion (60 Hz : 7 kHz, 4:1)  
Frequency Response ( ±1dB)  
< 0.03%  
< 0.03%  
10Hz-100kHz  
500  
Damping Factor (20-20,000 Hz, 8 ohms)  
Speaker Impedance (Normal mode)  
Signal to Noise Ratio (IHF A network)  
Input Impedance/Sensitivity  
4 ohms minimum  
116 dB  
33 k Ohms/1.0 volt  
Power Requirements  
115 Volts, 60 Hz (U.S. version)  
230 Volts, 50 Hz (European version)  
Power Consumption  
250 Watts  
Dimensions (W x H x D)  
430 x 92 x 350 mm  
1615/16 x 35/8 x 1313/16 ins.  
Weight (net)  
8.1 kg, 17.86 lb.  
All specifications are accurate at the time of printing.  
Rotel reserves the right to make improvements without notice.  
 
The Rotel Co. Ltd.  
10-10 Shinsen-Cho  
Shibuya-Ku  
Tokyo 150-0045  
Japan  
Phone: +81 3-5458-5325  
Fax: +81 3-5458-5310  
Rotel of America  
54 Concord Street  
North Reading, MA 01864-2699  
USA  
Phone: +1 978-664-3820  
Fax: +1 978-664-4109  
Rotel Europe  
Meadow Road  
Worthing, West Sussex BN11 2RX  
England  
Phone: +44 (0)1903 524 813  
Fax: +44 (0)1903 524 831  
Rotel Deutschland  
Kleine Heide 12  
D-33790 Halle/Westf.  
Germany  
Phone: +49 05201-87170  
Fax: +49 05201-73370  
082 OMRB-1050 112000  
 

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