Turn On/Off Mode Selector; +12V Trigger Input And Output; Input Signal Connections; Speaker Connections - Rotel RB-1572-V2 Owner's Manual

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Turn On/Off Mode Selector

The amplifi er can be turned on and off automatically 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

The jack labeled IN is for connecting the 3.5mm Plug/Cable carrying
a +12 volt trigger signal to turn the amplifi er on and off. To use this
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feature the adjacent switch
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.

Input Signal Connections

See Figure 2
The RB-1562 and RB-1572 have standard unbalanced RCA-type input
connectors, the type used on nearly all audio equipment. There is an
RCA input for each of the two amplifi er channels. These RCA inputs
accept audio signals from preamplifi ers or surround sound processors.
Use high quality audio interconnect cables for best performance.

Speaker Connections

See Figure 2
The RB-1562 and RB-1572 have two sets of dual binding post speaker
connection terminals, for each amplifi er channel.

Speaker Selection

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

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the amplifi er 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 appropriate cables for your system.
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4
must be set in the ON position (see
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RB-1562 / RB-1572 Stereo Power Amplifi ers

Polarity and Phasing

The polarity – the positive/negative orientation of the connections
– for every speaker and amplifi er 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 amplifi er connection.

Speaker Wire Connections

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Note: The following text describes both binding post and banana
plug connections. DO NOT use both connection methods in
combination to connect multiple speakers.
The amplifi er has two sets of color coded terminals for each amplifi er
channel. Having two sets of terminals for each channel makes it easy
to bi-wire the speakers. The speaker terminals accept bare wire,
connector lugs, or "banana" type connectors (except in the European
Community countries where their use is not permitted).
Route the wires from the amplifi er to the speakers. Give yourself
enough slack so you can move the components to allow access to the
speaker connectors.
Note: Be sure to notice the location of the LEFT and RIGHT speaker
terminals and connect your LEFT and RIGHT speakers to the correct
outputs. Take extra care if using two sets of wires to bi-wire your
speakers.
If you are using banana plugs, connect them to the wires and then
plug into the backs of the speaker connectors. When using banana
plugs, the collars of the binding post terminals 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 binding post 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 fi rmly in
place.
Note: Be sure there are no loose wire strands that could touch
adjacent wires or connectors.