RB-1070 Stereo Power Amplifier
Placement
The RB-1070 generates heat as part of its nor- mal operation. The heat sinks and ventilation 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 chas- sis, and reasonable airflow through the in- stallation location, to prevent the amplifier from overheating.
Likewise, remember the weight of the ampli- fier when you select an installation location. Make sure that the shelf or cabinet can sup- port its considerable bulk. Again, use com- mon sense.
AC Power and Control
AC Power Input 
Because of its high power rating, the RB-1070 can draw considerable current. Therefore, it should be plugged directly into a 2-pin po- larized 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-1070 and all the other components con- nected to it.
Be sure the power switch on the front panel of the RB-1070 is turned off (in the out posi- tion). Then, connect the supplied power cord to the AC power outlet.
Your RB-1070 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-1070 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-1070 exposes you to dangerous voltages. Consult a qualified service person or the Rotel factory service department for information.
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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 au- dio 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.
Protection Circuitry 
The RB-1070 features a thermal protection cir- cuit that protects the amplifier against potential damage in the event of extreme or faulty operating conditions. Unlike many designs, the RB-1070’s protection circuit is indepen- dent 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 tem- peratures exceed safe limits.
Most likely, you will never see this protection circuitry in action. However, should a faulty condition arise, the amplifier will stop play- ing 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 iden- tify 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 lead- ing to an overheating condition. In very rare cases, highly reactive or extremely low im- pedance speaker loads could cause the pro- tection 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.
Input Signal Connection 
[See Figure 2 for normal stereo wir-
ing illustration.]
The RB-1070 has conventional RCA type in- put connectors, the type found on nearly all audio equipment.
Note: To prevent loud noises that neither you nor your speakers will appreciate, make sure the amplifier is turned off when you make any signal connections.
Select a high quality pair of audio intercon- nect cables. Connect the left channel output of your preamp to the left channel input on the RB-1070. Connect the right channel out- put of your preamp to the right channel in- put.
Speaker Connection
Speaker Selection
We recommend using loudspeakers with a nominal impedance of 4 ohms or higher with the RB-1070. You should exercise some cau- tion in driving multiple pairs of speakers in parallel configuration, because the effective impedance the amplifier sees is cut in half. For example, when driving two pair of 8 ohm speakers, the amplifier sees a 4 ohm load. When driving multiple speakers in parallel, it is recommended that you select speakers with a nominal impedance of 8 ohms or higher. Speaker impedance ratings are less than precise. In practice, very few loudspeakers will present any problems for the RB-1070. See your authorized Rotel dealer if you have any questions.
Speaker Wire Selection
Use insulated two-conductor stranded wire to connect the RB-1070 to the speakers. The size and quality of the wire can have an audible effect on the performance of the system. Stan- dard speaker wire will work, but can result in lower output or diminished bass response, particularly over longer distances. In general, heavier wire will improve the sound. For best performance, you may want to consider spe- cial high-quality speaker cables. Your autho- rized Rotel dealer can help in the selection of appropriate cables for your system.
