Rotel Stereo Amplifier RC 972 User Guide

RC-972  
STEREO CONTROL AMPLIFIER  
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Ow n e rs Ma n u a l  
 
STEREO CONTROL AMPLIFIER RC-9 7 2  
Figure 1: Controls and Connections  
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Figure 2: RR-C91 Remote Control  
STANDBY  
15  
CD  
TUNER  
VIDEO  
AUX 1  
AUX 2  
16  
VOLUME  
MUTE  
17  
18  
RR-C91  
3
 
STEREO CONTROL AMPLIFIER RC-9 7 2  
Figure 3: Output Connections  
ROTEL RC-972  
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ROTEL RB-981  
W ARNING:TO REDUCE THE RISK OF FIRE  
OR ELECTRICAL SHOCK, DO NOT EXPOSE  
THIS EQUIPMENT TO RAIN OR MOISTURE.  
SPEAKER IMPEDANCE  
CAUTION  
STEREO  
4
OHMS MINIMUM  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
POW ER AMPLIFIER  
MODEL NO. RB-9 8 1  
POW ER CONSUMPTION: 4 0 0 W  
BRIDGED  
8
OHMS MINIMUM  
AVIS: RISQUE DE CHOC ELECTRIQUE–NE PAS OUVRIR  
SPEAKERS  
RIGHT  
LEFT  
RIGHT INPUT  
LEFT INPUT  
SERIAL NO.  
Figure 4: Line Level Input Connection  
CD PLAYER  
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ROTEL RC-972  
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Figure 5: Recorder Connections  
RECORDER  
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ROTEL RC-972  
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Englis h  
Contents (circled num bers refer to illustration)  
About Rotel  
A family whose passionate interest in music led them to  
manufacture high fidelity components of uncompromising quality  
founded Rotel over 30 years ago. Through the years that passion  
has remained undiminished and the family goal of providing  
exceptional value for audiophiles and music lovers, regardless of  
their budget, is shared by all Rotel employees.  
Contents _____________________________________________ 5  
About Rotel __________________________________________ 5  
Getting Started ______________________________________ 5  
A Few Precautions  
Placem ent  
6
6
6
Cables  
Rem ote Control ______________________________________ 6  
The engineers work as a close team, listening to, and fine tuning  
each new product until it reaches their exacting musical  
7
Rem ote Sensor  
6
6
Rem ote Control Batteries  
standards. They are free to choose components from around the  
world in order to make that product the best they can. You are  
likely to find capacitors from the United Kingdom and Germany,  
semi conductors from Japan or the United States, while toroidal  
power transformers are manufactured in Rotels own factory.  
1 2  
Output Connections  
______________________________ 6  
1 0  
Input Signal Connections  
__________________________ 7  
1 1  
Recorder Connections  
_____________________________ 7  
AC Pow er and Control ________________________________ 7  
1 4  
AC Power Input  
7
Rotels reputation for excellence has been earned through  
hundreds of good reviews and awards from the most respected  
reviewers in the industry, who listen to music every day. Their  
comments keep the company true to its goal – the pursuit of  
equipment that is musical, reliable and affordable.  
2
1 5  
Power/Standby Switch  
Power Indicator  
Auxiliary Power Outputs  
and  
1
7
7
1 3  
(U.S.A. version)  
Audio Controls _______________________________________ 8  
6
1 7  
Volum e Control  
Tone On/Off Switch  
8
8
8
8
8
8
8
5
All of us at Rotel thank you for buying this product and hope it will  
bring you many hours of enjoyment.  
4
Bass and Treble Controls  
Input “Function” Selector  
9
1 6  
8
Tape Monitor Switch  
1 8  
Mute Control  
(rem ote only)  
3
Phones Output  
Getting Started  
Recording ____________________________________________ 8  
Optional Phono Pream plifier __________________________ 8  
Troubleshooting ______________________________________ 9  
Thank you for purchasing the Rotel RC-972 Stereo Control  
Amplifier. When used in a high-quality music audio system, it will  
provide years of musical enjoyment.  
Power Indicator Is Not Lit  
Fuse Replacem ent  
No Sound  
9
9
9
The RC-972 is a full featured, high performance preamplifier. All  
aspects of the design have been optimized to retain the full  
dynamic range and subtle nuances of your music. The RC-972 has  
a highly regulated power supply incorporating a Rotel custom-  
designed power transformer. This low impedance power supply  
has ample power reserves, which enables the RC-972 to easily  
reproduce the most demanding audio signals. This type of design  
is more expensive to manufacture, but it is better for the music.  
Specifications ________________________________________ 9  
The RC-972 printed circuit boards (PCB) are designed with  
Symmetrical Circuit Traces. This insures that the precise timing of  
the music is maintained and faithfully recreated. The RC-972  
circuitry uses metal film resistors and polystyrene or  
polypropylene capacitors in important signal paths. All aspects of  
this design have been examined with the final goal being faithful  
reproduction of music.  
The RC-972 is straightforward in its installation and operation. If  
you have experience with other stereo systems, you shouldnt find  
anything perplexing. Simply plug in the associated components  
and enjoy.  
5
 
STEREO CONTROL AMPLIFIER RC-9 7 2  
A Few Precautions  
Please read this manual carefully. It provi-des complete  
information on how to incorporate the RC-972 into your system as  
well as general information that will help you get optimum sound  
performance. 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.  
Rem ote Control  
The RC-972 is supplied with an RR-C91 remote control. This  
compact unit allows you to operate many of the controls of the  
RC-972 from your listening location. When using the RR-C91 the  
emitter on the front of the control must be pointed at the RC-972  
front panel.  
Save the RC-972 shipping carton and all enclosed packing  
material for future use. Shipping or moving the RC-972 in anything  
other than the original packing material may result in severe  
damage to your amplifier.  
The RR-C91 duplicates the basic functions of the front panel  
control. When a control is on both the front panel and the remote  
control, both control identifiers are shown in the related  
instruction text. For example, to change the volume level you can  
6
Fill out and send in the owners registration card packed with the  
RC-972. 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.  
either turn the control  
on the front panel or use the buttons  
1 7  
on the remote control.  
7
Rem ote Sensor  
Placem ent  
The Remote Sensor picks up the infrared signals from the remote  
control. Do not cover or block the sensor. It must be unobstructed  
or the remote control will not work properly. The operation of the  
Remote Sensor can also be affected if it is exposed to bright light,  
particularly sunlight. Certain types of lighting, such as halogen  
lights, that emit a fair amount of infrared light, can also interfere  
with proper operation. In addition remote control functions may  
not work reliably if the batteries in the RR-C91 are weak.  
Like all audio components that handle low-level signals, the RC-972  
can be affected by its environment. To minimize the chance the  
RC-972 will pick up hum or interference, do not place it on top of  
an amplifier or any other device that has a large power  
transformer. Keep the RC-972 away from devices that have motors  
for the same reason. Do not place the RC-972 where it will be  
exposed to direct sunlight.  
Rem ote Control Batteries  
We recommend installing the RC-972 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.  
The supplied batteries must be installed before the remote control  
can be used. The battery cover is on the back of the RR-C91.  
Gently press the small triangular symbol on the cover and slide  
the cover down to expose the battery well. Install the batteries  
with the terminals as shown in the illustration in the battery well.  
Test the control for proper operation, then slide the cover back  
into place. When the batteries become weak the remote control  
wont operate the RC-972 consistently. Installing fresh batteries  
should eliminate the problem.  
The RC-972 is supplied with a compact, easy to use remote control  
– the RR-C91. In order to take advantage of the convenience it  
provided, the RC-972 must be placed where you can see the  
Remote Sensor on the front panel.  
Cables  
Note: Remove the batteries from the remote control if it will not be  
used for a long period of time. Do not leave run down batteries in  
the remote control. Exhausted batteries can leak corrosive chemi-  
cals which will damage the unit.  
Be sure to keep the power cords, digital signal cables and regular  
audio signal cables in your installation away from each other. This  
will minimize the chance of the regular audio signal cables  
picking up noise or interference from the power cords or digital  
cables. Using only high quality, shielded cables will also help to  
prevent noise or interference from degrading the sound quality of  
your system. If you have any questions see your authorized Rotel  
dealer for advice about the best cable to use with your system  
1 2  
Output Connections  
[See Figure 3 for RCA output connection illustration.]  
The RC-972 has RCA-type output connectors that are compatible  
with the inputs of most power amplifiers. Use high quality cables  
and be sure to connect the Left and Right channel outputs of the  
RC-972 to the correct channels of the amplifier.  
There are two sets of outputs on the RC-972. The second set of  
outputs may be used in custom system configurations to drive a  
second power amplifier or to supply a signal to a special signal  
processor.  
6
 
Englis h  
1 0  
Input Signal Connections  
AC Power and Control  
[See Figure 4 for input connection illustration.]  
The RC-972 has conventional RCA type input connectors, the type  
found on nearly all audio equipment.  
1 4  
AC Pow er Input  
The RC-972 does not use a significant amount of power. However  
there are two auxiliary power outlets on the back of the unit,  
which can be used to supply power for other units. Consequently  
it is usually best to plug the RC-972 directly into a 2-pin polarized  
wall outlet. Avoid the use of extension cords. 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 components  
connected to it.  
Note: To prevent loud noises that neither you nor your speakers  
will appreciate, make sure the system is turned off when you  
make any signal connections.  
The CD, Tuner, and Aux inputs of the RC-972 are “line level”  
inputs. These are for connecting components such as CD players,  
Hi Fi or NICAM Stereo video cassette recorders, tuners for audio  
or video, Laser Disc players or the analog output from a CD ROM  
drive.  
Note: Do not connect the power cord for a power amplifier to the  
auxiliary power outlets on the RC-972. Power amplifiers often  
draw more power than these outlets can provide.  
The Left and Right channels are clearly labeled and should be  
connected to the corresponding channels of the source  
component. The Left RCA connectors are white, the Right  
connectors are red. Use high quality RCA cables for connecting  
input source components to the RC-972. Ask your authorized Rotel  
dealer for advice about cables.  
Your RC-972 is configured at the factory for the proper AC line  
voltage in the country where you purchased it (either 115 volts AC  
or 230 volts AC with a line frequency of either 50 Hz or 60 Hz). The  
AC line configuration is noted on a decal on the back panel.  
Note: Should you move your RC-972 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. Open-  
ing the enclosure of the RC-972 exposes you to dangerous volt-  
ages. Consult a qualified service person or the Rotel factory  
service department for information.  
Note: The optional phono board card enables you to connect a  
phonograph to the RC-972. See your authorized Rotel dealer for  
more information.  
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 audio and video  
components) while you are away.  
1 1  
Recorder Connections  
[See Figure 5 for recorder connection illustration.]  
The Tape inputs and outputs can be connected to any record/  
playback device that accepts standard line level analog input and  
output signals. Typically that will be a conventional tape recorder.  
1 5  
2
Power/Standby Switch  
and  
1
Power Indicator  
When connecting a recorder to the RC-972 remember that the  
outputs of the recorder must be connected to the tape inputs of  
the RC-972. Similarly the tape outputs of the RC-972 must be  
connected to the inputs of the recorder. As with other sources be  
sure to connect the Left and Right channels of each device to the  
proper channels on the associated components. Use high quality  
connecting cables to prevent loss of sound quality.  
The Power Indicator light above the Standby button is always  
illuminated when the RC-972 is connected to a “live” AC outlet.  
When the Power/Standby switch is pressed the RC-972 is turned  
on. The Function indicator light and Volume Control indicator  
light will illuminate. Pressing the Standby switch again will put  
the RC-972 in “standby” mode and these indicator lights are  
turned off.  
1 3  
Auxiliary Pow er Outputs  
(U.S.A. version)  
The RC-972 has two switched outlets on the back panel. Power is  
available from these outlets when the RC-972 is turned on. These  
outlets can provide up to a total of 400 watts. They are appropriate  
for supplying power to signal sources, such as CD players, tuners,  
or tape decks. They should not be used for power amplifiers.  
Connecting components that will draw more than 400 watts to  
these outputs could damage the Standby switch in the RC-972.  
7
 
STEREO CONTROL AMPLIFIER RC-9 7 2  
3
Phones Output  
Audio Controls  
The Phones output allows you to connect headphones for private  
listening. This output accommodates standard stereo phone (1/4”)  
plugs. If your headphones have another type of plug, such as a  
1/8” mini-plug, you will need an adapter plug. Contact your  
authorized Rotel dealer, to get the correct adapter plug.  
6
1 7  
Volum e Control  
6
As with all normal volume controls turn the control knob  
clockwise to increase the volume, or counterclockwise to  
decrease the volume. Or press the remote control volume button  
Note: Plugging in a set of headphones does not cut off the signal  
to the outputs. In most instances you should turn off the power  
amplifier when listening to headphones.  
1 7  
next to the symbol to turn the volume up; press the button  
next to the symbol to turn the volume down.  
5
Tone On/ Off Sw itch  
When the switch is in the Off position the tone control circuits are  
bypassed to ensure the purest possible sound. Leave the switch in  
the Off position unless you want to use the tone controls. Turn the  
switch to the On position if you want to adjust the tone controls.  
Recording  
9
Set the Function Selector switch  
to the component you want  
to use for the signal source. If you have a three-head cassette  
recorder, a three-head reel-to-reel tape recorder or a DAT  
recorder that allows simultaneous “read and write” operation you  
can monitor your recording by setting the Tape Monitor switch  
4
Bass and Treble Controls  
When the Tone Switch is in the On position, turning the Bass and  
Treble controls adjusts the tone balance of the sound. Turn the  
controls clockwise to increase the bass or treble output. Turn the  
controls counterclockwise to decrease the bass or treble output.  
8
to the “Tape” position. When not monitoring a recording, or  
listening to a previously recorded tape, set the Tape Monitor  
8
switch  
to the “Source” position.  
A properly set up high-performance audio system produces the  
most natural sound with little or no adjustment of the tone  
controls. Use these controls sparingly. Be particularly careful  
when turning the controls up (clockwise). This increases the  
power output in the bass or treble range, increasing the load on  
the amplifier and speakers.  
Optional Phono Board Card  
In order to use an analog phono turntable with the RC-972 you  
must install the optional MM or MC phono board card. These plug  
in boards convert the Aux 1 input to a phono input. They can be  
installed by your authorized Rotel dealer, or you can install them  
yourself. If you plan to install them yourself, follow the supplied  
instructions very carefully. Failure to precisely follow the  
instructions can result in damage to the RC-972 or personal injury.  
If you are not sure you have the knowledge and skills to properly  
install the preamp boards, have the installation done by your  
dealer.  
9
1 6  
Input “Function” Selector  
The setting of the Function Selector controls which of the input  
signals goes to the main outputs and onto the power amplifier –  
or, more simply, which source is heard. Turn the knob on the front  
9
panel control  
to the source you want to use, or press the  
1 6  
corresponding button  
on the RR-C91 remote The signal from  
the selected source also goes to the Tape Outputs.  
8
Tape Monitor Sw itch  
When the Tape Monitor switch is in the Source position you hear  
the sound source that is selected by the Function Selector.  
Turning the switch to the Tape position lets you listen to a  
previously recorded tape, or monitor the sound from the tape  
recorder while you are recording.  
1 8  
Mute Control  
(rem ote only)  
To temporarily mute the sound of the system press the Mute  
Button on the RR-C91 remote. Press the button again to return the  
sound volume to the original level. The LED in the volume control  
will flash when the unit is muted.  
8
 
Englis h  
Troubleshooting  
Specifications  
Total Harmonic Distortion (20 Hz-20 kHz)  
Intermodulation Distortion (60 Hz : 7 kHz, 4:1)  
Input Sensitivity / Impedance  
Output Level / Impedance  
< 0.004%  
Most difficulties in audio systems are the result of incorrect  
connections, or improper control settings. If you encounter  
problems, isolate the area of the difficulty, check the control  
settings, determine the cause of the fault and make the necessary  
changes. If you are unable to get sound from the RC-972, refer to  
the suggestions for the following conditions:  
< 0.004% at 1V output  
150 mV / 24 kOhms  
1 V/ 100 Ohms  
Usable Headphone Impedance  
Frequency Response  
8 - 2,000 Ohms  
4Hz-100kHz, +0, -3dB  
±6dB at 100 Hz and 10K Hz  
95 dB  
Tone Controls  
Signal to Noise Ratio (IHF Aweighted)  
Power Requirements  
USA Version  
Pow er Indicator Is Not Lit  
115 Volts, 60 Hz  
230 Volt, 50 Hz  
European Version  
The Power Indicator should be lit whenever the RC-972 is plugged  
into the wall power outlet. If it does not light, test the power outlet  
with another electrical device, such as a lamp. Be sure the power  
outlet being used is not controlled by a switch that has been  
turned off.  
Power Consumption  
10 Watts  
Dimensions (W x H x D)  
440 x 72 x 286 mm  
173/8” x 27/8” x 111/4”  
Weight (net)  
4.3 kg, 9.46 lbs.  
All specifications are accurate at the time of printing.  
Rotel reserves the right to make improvements without notice.  
Fuse Replacem ent  
If another electrical device works when plugged into the power  
outlet, and the Power Indicator still will not light, it indicates that  
the internal power fuse may have blown. If you believe this has  
happened, contact your authorized Rotel dealer to get the fuse  
replaced.  
No Sound  
Be sure the RC-972 is turned on. The Volume Control indicator  
light and the selected function indicator should be lit. Be sure the  
Function Selector is set to the proper input. Check to see if wthe  
Mute Function has been engaged. Check the signal source to see  
if it is functioning properly. Make sure the cables from the signal  
source to the RC-972 inputs are connected properly. Check the  
power amplifier for power and proper operation. Check all the  
wiring between the RC-972 and the power amplifier, and the  
power amplifier and speakers.  
9
 
RC-972  
STEREO CONTROL AMPLIFIER  
The Rotel Co. Ltd.  
10-10 Shinsen-Cho  
Shibuya-Ku  
Tokyo 150-0045  
J apan  
Phone: +81-3-5458-5325  
Fax: +81-3-5458-5310  
Rotel of Am erica  
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 1903-524-813  
Fax: +44 1903-524-831  
Rotel Deutschland  
Kleine Heide 12  
D-33790 Halle/Westf.  
Germ any  
Phone: +49 5201-87170  
Fax: +49 5201-73370  
082 OMRC-972 081899  
 

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