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RB-1091 Mono Power Amplifier
AC Power and Control
AC Power Input
9
The RB-1091 is supplied with the proper AC
power cord. Use only this cord or an exact
equivalent. Do not use an extension cord. A
heavy duty multi-tap power outlet strip may
be used, but only if it is rated to handle the
current demand of the RB-1091.
Be sure the Power Switch on the front panel of
the RB-1091 is turned off. Then, plug one end
of the cord into the AC power connector
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on
the back panel of the amplifier. Plug the other
end into an appropriate AC outlet.
Your RB-1091 is configured at the factory for the
proper AC line voltage in the country where you
purchased it (USA: 120 volts/60 Hz, Europe:
230 volts/50 Hz). The AC line configuration is
noted on a label on the back panel.
NOTE: Should you move your RB-1091 to
another country, it is possible to configure
your amplifier for use on a different line
voltage. Do not attempt to perform this con
-
version yourself. Opening the enclosure of
the RB-1091 exposes you to dangerous volt-
ages. Consult a qualified technician or the
Rotel factory service department for infor
-
mation.
If you are going to be away from home for
an extended period of time, it is a sensible
precaution to unplug your amplifier.
Power Switch and
Indicator
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The Power Switch is located on the front panel.
To turn the amplifier on (or to activate either of
the optional automatic power-on modes), 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 position.
Turn On/Off Mode Selector
7
The RB-1091 can be turned on and off auto-
matically by using its “12V Trigger” system.
The Turn On/Off Mode Selector switch is used
to select which method is used.
• With the switch in the OFF position, the
amplifier is turned on or off manually using
the front panel power switch.
• With the switch in the 12V TRIG. position,
the amplifier is turned on automatically
when a 12 volt trigger signal is applied to
the 3.5mm Jack labeled IN. 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.
+12V Trigger Input
and Output
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The jack labeled IN is for connecting the 3.5mm
Plug/Cable carrying a +12 volt trigger signal
to turn the amplifier on and off. To use this
feature the adjacent switch
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must be set in
the 12V TRIG position (see previous section).
This input accepts any control signal (AC or
DC) ranging from 3 volts to 30 volts.
The jack labeled OUT is for connecting another
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.
Protection Indicators
3
Thermal and protection circuits protect the am-
plifier against potential damage in the event of
extreme or faulty operating conditions. Unlike
many designs, the RB-1091’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 amplifier
if safe limits are exceeded.
In addition, the RB-1091 includes overcurrent
protection which operates only when load
impedances drop too low.
Should a faulty condition arise, the amplifier
will stop playing and the PROTECTION LED
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 protection circuit
will automatically reset and the PROTECTION
LED should go out.
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 imped
-
ance speaker loads could cause the protection
circuit to engage.
Input Signal Connection
4
See Figure 2
The RB-1091 has a standard unbalanced RCA-
type input connector, the type used on nearly all
audio equipment. This RCA input accept audio
signals from preamplifiers or surround sound
processors. Use high quality audio interconnect
cables for best performance.