Rotel Explore the RA-1070 and Its Advanced Speaker Selector Functions

RA-1070Stereo Integrated Amplifier

Preamp Outputs

The RA-1070 has two sets of preamp outputs. The signal from the source selected with the Listening Selector buttons is always available from these outputs. Typically these outputs are used to provide a signal to another integrated amplifier or power amplifier, which is used to drive remote speakers. Or they may be used to provide signals to a surround sound pro- cessor or other signal processing component.

Speaker Outputs and Speaker Selector Switch

[See Figure 4 for speaker connec- tion illustration.]

The RA-1070 has two sets of speaker outputs, labeled “A” and “B” . The speaker out- puts are controlled by the Speaker Selector switch on the front panel.

Speaker Selection

If only one set of speakers will be used at any given time, the speakers may have an imped- ance as low as 4 ohms. If there are times when both the A and B speakers will be used, all the speakers should have an impedance of 8 ohms or more. Speaker impedance ratings are less than precise. In practice, very few loud- speakers will present any problems for the RA-1070. See your authorized Rotel dealer if you have any questions.

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the RA-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 cables for your system.

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Polarity and Phasing

The polarity – the positive/negative orienta- tion of the connections – for every speaker and amplifier connection must be consistent so all the speakers will be in phase. If the po- larity of one connection is reversed, bass output will be very weak and stereo imaging de- graded. All wire is marked so you can iden- tify 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 negative conductors and be consistent with every speaker and amplifier connection.

Speaker Connection

Turn off all the components in the system be- fore connecting the speakers. The RA-1070 has color-coded binding post type speaker connec- tors on the back panel (except in European Com- munity countries where their use is not permit- ted). These connectors accept bare wire, con- nector lugs, or dual banana type connectors.

Route the wire from the RA-1070 to the speak- ers. Give yourself enough slack so you can move the components to allow access to the speaker connectors. If you are using dual banana plugs, connect them to the wires and then plug into the backs of the binding posts. The thumbscrews of the binding posts should be screwed in all the way (clockwise).

If you are using terminal lugs, connect them to the wires. If you are attaching bare wires directly to the binding posts, separate the wire conductors and strip the insulation from the end of each conductor. Be careful not to cut into the wire strands. Unscrew (turn counter- clockwise) the binding post thumbscrews. Place the connector lug or wire around the bind- ing post shaft. Turn the thumbscrews clock- wise to clamp the connector lug or wire firmly in place.

NOTE: Be sure there are no loose wire strands that could touch adjacent wires or connectors.

IR Inputs and Outputs

External Remote Input

This 3.5 mm mini-jack (labeled EXT REM IN) receives command codes from an industry- standard infrared receivers (Xantech, etc.) located in the main listening room. This fea- ture is useful when the unit is installed in a cabinet and the front-panel sensor is blocked. Consult your authorized Rotel dealer for in- formation on external receivers and the proper wiring of a jack to fit the mini-jack receptacle.

NOTE: The IR signals from the EXTERNAL REMOTE IN jack can be relayed to source components using external IR emitters or hardwired connections from the IR OUT jacks.

IR Output

The IR OUT 1 and 2 jacks send IR signals re- ceived at the EXTERNAL REM IN jack to an infrared emitter placed in front of a source component or to Rotel CD players, cassette decks, or tuners with a compatible rear panel IR connector.

This output is used to allow IR signals to pass along IR signals from a remote control when the sensors on the source components are blocked by installation in a cabinet.

See your authorized Rotel dealer for informa- tion on IR repeater systems.

NOTE: The EXT REM IN jack located next to the these jacks is for use with an external IR sensor duplicating the front panel IR sen- sor and located in the primary zone.

12 Volt Trigger Outlet

Some audio components can be turned on automatically when they receive a 12V turn on “signal”. The 12V Trigger Outputs of the RA-1070 provide the required signal. Con- nect compatible components to the RA-1070 with a conventional 1/8” miniplug cable. When the RA-1070 is in Standby mode, the trigger signal is interupted, so the components controlled by it are turned off.