Owner's manual

one until the problem reappears. If you are unable to locate the source of the problem then you should
consult your ROTELhi fi AUTHORIZED DEALER for advice or service.
A FINAL WORD FROM ROTEL
Even though some people consider 25 watts per channel a modest power output we feel that this is a
superb amplifier for smaller rooms or very efficient speakers. We have designed this amplifier for high
performance using test equipment and the human ear. We believe that extensive listening and test
equipment is both useful in the design of audio electronics. This is time consuming but we feel that the
music benefits from this care and attention to detail. We realize that there are many choices available and
we thank you again for choosing our RA 921 stereo integrated amplifier to amplify your music. Enjoy the
music!
SPECIFICATIONS:
Rated Power (20-20 kHz < 0.03%, 8 ohms) 25 Watts
DIN Output (1 kHz, 1% THD, 4 ohms) 35 Watts
Total Harmonic Distortion (20-20 kHz, 8 ohms) < 0.03%
Intermodulation Distortion (60 Hz: 7 kHz, 4:1) < 0.03%
Signal to Noise ratio, all inputs, IHF A >
98 dB, phono 78 dB
Phono Sensitivity, Input Impedance 2.5 mV, 47 kOhms
Phono Frequency Response 20-20,000 +
1.5 dB
Amplifier Frequency Response 10-100,000 Hz +1 dB, -3 dB
Tone Control
Bass + 6 dB @ 100 Hz
Treble + 6 dB @ 10 kHz
Power requirement 115 volts 60 Hz or
230 volts 50 Hz
Power consumption 180 watts
Dimensions, W x H x D mm 440 x 92 x 304
inches 17.38 x 3.63 x 11.96
Weight (net) 4.8 kg, 10.56 Lb.
All specifications are accurate at the time of printing. Rotel reserves the right to make improvements
without notice.
SYSTEM TROUBLESHOOTING HINTS
NO POWER IS THE AC CORD CONNECTED TO A SWITCHED AC OUTLET?
IS THE SWITCHED AC OUTLET TURNED ON?
CHECK THE POWER FUSE FOR THE AC OUTLET.
NO SOUND CORRECT INPUT SELECTED? IS THE AMPLIFIER
TURNED ON? IS THE SOURCE COMPONENT TURNED ON?
IS THE SOURCE COMPONENT CONNECTED PROPERLY?
ARE THE SPEAKER WIRES CONNECTED PROPERLY?
NO BASS IS THE SUBWOOFER AMPLIFIER TURNED ON?
IS THE POWERED SUBWOOFER TURNED ON?
ARE THE WOOFERS IN YOUR SPEAKERS DAMAGED?
ARE THE SPEAKERS WIRED CORRECTLY?
POOR TRACKING IS THE DISC DIRTY OR SCRATCHED? IS THE DISC
(CD PLAYER) SEVERELY WARPED? IS THE DISC SEMI-TRANSPARENT OR
POORLY MADE WITH VISIBLE PIN HOLES?
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A WORD FROM All OF US AT ROTEL
We thank you for purchasing one of our RA 921 stereo integrated amplifiers. We have been designing and
manufacturing high quality, high performance audio electronics for more than 35 years. Rotel s passion for
good sound and our love of music are well known worldwide. This integrated amplifier was designed to offer
lifelike sound and is a natural extension of our love for music. We believe that the music played through this
integrated amplifier will be a source of enjoyment to you for many years to come. We have designed this
amp to be durable; easy to use and to have high fidelity to the original sound.
Please read this owners manual to ensure that your amplifier is properly installed and able to offer optimum
performance. We appreciate being a part of your life.
FEATURES
This stereo integrated amplifier has been designed for high performance. It has symmetrical circuit path,
utilized to ensure absolutely identical timing integrity between the two channels of the amplifier. The power
supply derives from a ROTEL designed power transformer. We also utilize ROTEL custom designed
capacitors to improve the speed and damping factor of the amplifier. We believe in highly regulated power
supplies and build these into all of our products. We feel the extra expense of building in an excellent power
supply is worthwhile because it is good for the music.
INSTALLATION
Please place the unit on a DRY, level surface away from direct sunlight. Avoid placing objects on top of the
RA 921 that will block the cooling vents, as they may cause the amplifier to overheat. If the amplifier is
mounted inside a cabinet, please be certain that there is adequate airflow to ensure proper cooling. Do not
allow water or objects to fall into the amplifier, as these will damage the circuitry. Avoid installing the
amplifier in a location where excessive humidity, vibration or moisture will be a problem. We recommend
installing the amplifier in furniture designed to house Hi Fi components. This will allow the amplifier to be on
a separate shelf with nothing stacked on top of it. This will minimize heat and potential interference from
other components in your system. Component furniture will also reduce or suppress vibration and all audio
components will provide improved sound when free from vibration. Ask your ROTELhi fi Authorized Dealer
for advice about component furniture and proper installation of audio components.
ELECTRICAL REQUIREMENTS AND CLEANING
This amplifier is designed to work on AC voltage and the correct voltage is displayed on the Back Panel. Do
not attempt to operate the amplifier on incorrect voltage as this will damage the circuitry and will
void your warranty. If you are in doubt about the correct voltage for this amplifier we suggest that you
please read the label on the back panel, the label on the packing carton or consult with your ROTELhi fi
Authorized Dealer for confirmation of the correct voltage. Connect the Power Cord to your wall socket for
AC power. We strongly recommend that the amplifier be connected to the mains wall socket, not an
extension cord, for best sound quality.
When you wish to disconnect the power cord from the wall always grasp the plug firmly and then pull it out of
the wall socket. Do not unplug the power cord from the wall by pulling the cord only. This may damage the
power cord and create a hazardous condition. If you wish to clean the cabinet, we suggest that you clean it
with a soft, DRY cloth. Never use cleaning compounds or solvents to clean the cabinet as they may damage
the finish or remove the labels. This could also damage the circuitry if any liquid or residue falls inside the
amplifier.
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