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Save the RB-1090 shipping carton and all
enclosed packing material for future use.
Shipping or moving the RB-1090 in anything
other than the original packing material may
result in severe damage to your amplifier.
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.
Placement
The RB-1090 generates heat as part of its
normal operation. The heat sinks and ven-
tilation 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 chassis, and reasonable airflow through
the installation location, to prevent the am-
plifier from overheating.
Likewise, remember the weight of the am-
plifier when you select an installation loca-
tion. Make sure that the shelf or cabinet can
support its considerable bulk. Again, use
common sense.
NOTE
: The RB-1090 has caster wheels at
the rear to help position it.
About THX Ultra™
THX is an exclusive set of standards and
technologies established by the world-re-
nowned film production company, Lucasfilms
Ltd. THX grew from George Lucas’ personal
desire to make your experience of the film
soundtrack, in both movie theaters and in
your home theater, as faithful as possible to
what the director intended.
Movie sound tracks are mixed in special
movie theaters called dubbing stages and
are designed to be played back in movie
theaters with similar equipment and condi-
tions. The soundtrack created for movie the-
aters is then transferred directly onto
Laserdisc, VHS tape, DVD, etc., and is not
changed for playback in a small home the-
ater environment. THX engineers developed
patented technologies to accurately trans-
late the sound from the movie theater envi-
ronment into the home, correcting the tonal
and spatial errors that occur.
Before any home theater component can be
THX Ultra certified, it must incorporate the
THX technologies and also pass a rigorous
series of quality and performance tests. Only
then can a product feature the THX Ultra logo,
which is your guarantee that the Home The-
ater products you purchase will give you
superb performance for many years to come.
AC Power and Control
AC Power Input
Because of its high power rating, the RB-1090
can draw considerable current and may tax
your home’s electrical circuit. Therefore, it
should be plugged directly into a 3-pin po-
larized wall outlet. Do not use an extension
cord. A heavy duty multi-tap power outlet
strip may be used, but only if it (and the wall
outlet) is rated to handle the current de-
manded by the RB-1090.
NOTE
: The RB-1090 has a built-in surge at-
tenuator to prevent opening the electrical
circuit’s breaker or fuse at turn-on.
Be sure the POWER SWITCH on the front panel
of the RB-1090 is turned off (in the out po-
sition). Then, connect the supplied power
cord to the
POWER CONNECTOR on the back
panel of the amplifier and to the AC power
outlet.
Your RB-1090 is configured at the factory
for the proper AC line voltage in the coun-
try 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 con-
figuration is noted on a label on the back
panel.
NOTE
: Should you move your RB-1090 to
another country, it is possible to configure
your amplifier for use on a different line
voltage. Do not attempt to perform this
conversion yourself. Opening the enclo-
sure of the RB-1090 exposes you to dan-
gerous voltages. Consult a qualified
technician or the Rotel factory service de-
partment for 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 while you are away.
Power Switch
Power Indicator
The power switch is located in the center of
the front panel of your amplifier. To turn the
amplifier on, push the switch in. The LED in-
dicator above the switch will light, indicat-
ing that the amplifier is turned on. To turn
the amplifier off, push the button again and
return it to the out position.
Protection Circuitry
The RB-1090 features a thermal protection
circuit that protects the amplifier against po-
tential damage in the event of extreme or
faulty operating conditions. Unlike many
designs, the RB-1090’s protection circuit is
independent 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 am-
plifier if temperatures exceed safe limits.
In addition, the RB-1090 includes overcurrent
protection which operates only when load
impedances drop below 2 ohms. This pro-
tection is independent for the left and right
channels with separate front panel
PROTEC-
TION LEDS for each.
Most likely, you will never see this protec-
tion circuitry in action. However, should a
faulty condition arise, the amplifier will stop
playing and the
PROTECTION LEDS on the front
panel will light.
If this happens, turn the amplifier off, let it
cool down for several minutes, and attempt
to identify and correct the problem. When
you turn the amplifier back on, the protec-
tion circuit will automatically reset and the
PROTECTION LEDs should go out.
In most cases, the protection circuitry acti-
vates because of a fault condition such as
shorted speaker wires, or inadequate ven-
tilation leading to an overheating condition.
In very rare cases, highly reactive or ex-
tremely low impedance speaker loads could
cause the protection circuit to engage.