Rotel RC-1580 Speaker Selection, Speaker Wire Selection, Polarity and Phasing, Plug connection

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Speaker Selection

The nominal impedance of the loudspeaker(s) connected to the RMB- 1512 should be a minimum of 4 ohms. When driving multiple pairs of speakers connected in parallel, the effective impedance the amplifiier sees is cut in half. For example, when driving two pair of 8 ohm speakers, the amplifiier sees a 4 ohm load. When driving multiple speakers in parallel, select speakers with a nominal impedance of 8 ohms or higher.

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the RMB-1512 to the speakers. The size and quality of the wire can have an audible effect 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 cables for your system.

Polarity and Phasing

The polarity or positive/negative orientation of the connections for every speaker and amplifiier 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 different 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 amplifiier connection.

Speaker Wire Connection 6

See Figure 2

Route the wires from the RMB-1512 to the speakers. Give yourself enough slack so you can move the components to allow access to the speaker connectors.

The RMB-1512 has two pair of color-coded speaker connectors for each group of amplifiier channels, one for the left speaker, the other for the right speaker. Labels above the connectors show the proper connections for connecting speakers. These speaker connectors accept bare wire, connector lugs, or “banana” type connectors (except in the European Community countries where there use is not permitted).

The RMB-1512 also has a plug-in speaker connector that can make connection easier in custom installations. You can pre-wire the plug-in connector before the amplifiier is installed. The plug-in connector is wires in parallel with the bind post outputs.

Note: The following text describes both binding post and plug-in connections. DO NOT use both connection methods in combination to connect multiple speakers.

Binding Post connection 6

If you are using banana plugs, connect them to the wires and then plug into the backs of the binding posts. The collars of the speaker connectors 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 speaker connectors, separate the wire conductors and strip back the insulation from the end of each

conductor. Be careful not to cut into the wire strands. Unscrew (turn counterclockwise) the speaker connector collar. Place the connector lug around the shaft, or insert the bundled wire into the hole in the shaft. Turn the collars clockwise to clamp the connector lug or wire fiirmly in place.

For each group of channels, connect the left speaker to the pair of speaker connectors labeled LEFT. Connect the right speaker to the speaker connectors labeled RIGHT. Follow the labels printed above the connectors. Make sure that the positive terminal of the speaker is connected to the + terminal on the amplifiier. Make sure that the negative terminal of the speaker is connected to the terminal of the amplifiier.

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

Plug connection 8

Connect your speaker wires as shown in the illustration. Insert the wire into the open and turn the screw to clamp the wire in place.

Be sure to keep the polarity of the connections correct.

R+

R--

L--

L+