Speaker Connections, AC Power and Control | Rotel RB-1072 specification

AC Power and Control

AC Power Input 8

The RB-1072 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-1072.

Be sure the Power Switch on the front panel of the RB-1072 is turned off. Then, plug one end of the cord into the AC power connector 8on the back panel of the ampliﬁer. Plug the other end into an appropriate AC outlet.

Your RB-1072 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-1072 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-1072 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.

Turn On/Off Mode Selector 6

The RB-1072 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 7

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 6 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 Indicator 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-1072’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-1072 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.

English

Input Signal Connections 4

See Figure 2

The RB-1072 has standard unbalanced RCA- type input connectors, the type used on nearly all audio equipment. There is an RCA input for each of the two ampliﬁer channels. These RCA inputs accept audio signals from pre- ampliﬁers or surround sound processors. Use high quality audio interconnect cables for best performance.

Speaker Connections

See Figure 2

The RB-1072 has two sets of dual binding post speaker connection terminals, one set for each ampliﬁer channel.

Speaker Selection

The nominal impedance of the loudspeaker(s) connected to each channel of the RB-1072 should be no lower than 4 ohms.

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the RB-1072 to the speakers. The size and quality of the wire can have an audible ef- fect on the performance of the system. Standard 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 special high-quality speaker cables. Your authorized Rotel dealer can help in the selection of appropriate cables for your system.

Polarity and Phasing

The polarity – the positive/negative orientation of the connections – for every speaker and ampliﬁer connection must be consistent so all the speakers will be in phase. If the polarity of one connection is mistakenly reversed, bass output will be very weak and stereo imaging degraded. All wire is marked so you can identify the two conductors. There may be ribs or a stripe on the insulation of one conductor. The wire may have clear insulation with dif- ferent color conductors (copper and silver). There may be polarity indications printed on the insulation. Identify the positive and nega- tive conductors and be consistent with every speaker and ampliﬁer connection.