Rotel RB-1091 Protection Indicators, AC Power Input, Power Switch and Indicator, See Figure

RB-1091Mono 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 9on 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 12

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.

6

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 8

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 7 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.