AC Power and Control

AC Power Input

Because of its high power rating, the RB-1050 can draw considerable current. Therefore, it should be plugged directly into a 2-pin polarized wall outlet. Do not use an extension cord. 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 RB-1050 and all the other components connected to it.

Be sure the Power Switch on the front panel of the RB-1050 is turned off (in the out posi- tion). 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-1050 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 RB-1050 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. Opening the enclosure of the RB-1050 exposes you to dangerous voltages. Consult a qualified service person or the Rotel factory service department 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 (as well as other audio and video components) while you are away.

Power Switch and Power Indicator

The power switch is located on the front panel of your amplifier. To turn the amplifier on, 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 po- sition.

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12V Trigger Mode Selector

The Amplifier provides the option for manual or automatic power on/off operation. These modes are selectable using a switch on the back panel.

NOTE: The front panel Power Switch must be ON for the automatic turn on system to work.

When the switch is in the “12V TRIG” posi- tion, the amplifier is turned on automatically when a 12V trigger signal is present at the

3.5mm Jack of TRIGGER IN on the rear panel. The amplifier will go into standby mode af- ter a delay of 5 minutes if the +12V signal is not present.

When the switch is in the “SIGNAL SENSE” position the amplfier is turned on whenever an audio signal is applied to the Inputs . If no audio signal is applied to the inputs the amplifier will return to standby mode after a delay of 5 minutes.

When the switch is in the “OFF” position the automatic activation system is turned off. Only the front panel Power Switch will control the amplifier.

12V Trigger Input

and Output

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 front panel Power Switch must be set to the ON position. 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.

Circuit Breaker

A circuit breaker on the rear panel protects the amplifier’s electrical circuity. Generally, the circuit breaker will only open under a fault condition which results in excessive current draw. To reset the circuit breaker, press the button. Should it repeatedly open, contact your authorized Rotel dealer for troubleshooting assistance.

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Protection Circuitry

The RB-1050 features a thermal protection circuit that protects the amplifier against potential damage in the event of extreme or faulty operating conditions. Unlike many designs, the RB-1050’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 temperatures exceed safe limits.

Most likely, you will never see this protection circuitry in action. However, should a faulty condition arise, the amplifier will stop playing and the LED indicator on the front panel will light up.

If this happens, turn the amplifier off, let it cool down for several minutes, and attempt to identify and correct the problem that caused the protection circuitry to engage. When you turn the amplifier back on, the protection circuit will automatically reset and the indicator LED should go out.

In most cases, the protection circuitry activates because of a fault condition such as shorted speaker wires, or inadequate ventilation leading to an overheating condition. In very rare cases, highly reactive or extremely low impedance speaker loads could cause the protection circuit to engage.

If the protection circuitry triggers repeatedly and you are unable to isolate and correct the faulty condition, contact your authorized Rotel dealer for assistance in troubleshooting.

Clipping Indicators

Each channel has a Clipping Indicator on the front panel. “Clippping” occurs when an amplifier it driven to the point it begins to produce distortion. The term refers to the flattening or “clipping” of the musical waveform that occurs when an amplifier is driven beyond its rated power. If the Clipping Indicators light, reduce the volume level of the system. Failure to so do could result in damage to the speakers connected to the amplifier. It may also cause the Protection Circuit to activate.