Power Switch; And Power Indicator; Input Signal Connections; Digital Signal Inputs - Rotel RA-12 Owner's Manual

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the current demanded by the amplifier and all the other components
connected to it.
Your unit is configured at the factory for the proper AC line voltage in the
country where you purchased it (either 120 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 amplifier to another country, it is possible to
reconfigure it for use on a different line voltage. Do not attempt to perform
this conversion yourself. Opening the enclosure of the unit exposes you
to dangerous voltages. Consult a qualified service person or the Rotel
factory service department for information.
NOTE: Some products are intended for sale in more than one country
and as such are supplied with more than one AC cord. Please only use
the one appropriate for your country/region.
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 audio and video components) while you are
away.

Power Switch

and Power Indicator

1 A
Press the front panel Power Switch button, to turn the unit on. The Power
Indicator light is illuminated when the unit is on. Press Power Switch
button again to turn the unit off.
When the power switch is in the ON position, the remote control ON
and OFF buttons may be used to activate the RA-11/RA-12. In Standby
mode the power LED remains lit, but the display is turned OFF.

Input Signal Connections

[See Figure 2 .
NOTE: To prevent loud noises that neither you nor your speakers will
appreciate, make sure the system is turned off when you make any
signal connections.
Phono Input and Ground Connection (GND)
e
Plug the cable from the turntable into the appropriate left and right phono
inputs. If the turntable has a "ground" wire, connect it to the screw terminal
to the left of the Phono inputs. It will help prevent hum and noise.

Line Level Inputs

e
The CD, Tuner, and Aux inputs of the amplifier are "line level" inputs.
These are for connecting components such as CD players, Hi Fi or NICAM
Stereo video cassette recorders, tuners, Laser Disc players or the analog
output from a CD-ROM drive.
The Left and Right channels are labeled and should be connected to the
corresponding channels of the source component. The Left connectors
are white, the Right connectors are red. Use high quality RCA cables
for connecting input source components to the unit. Ask your authorized
Rotel dealer for advice about cables.
2

Digital Signal Inputs

[See Figure 2 .]
There are two sets of digital inputs labeled COAXIAL and OPTICAL. Connect
the COAXIAL or OPTICAL outputs of your player into these sockets. The
digital signals will be decoded and played by the amplifier. The unit is
capable of decoding PCM signals up to 24 bit, 192kHZ.

Preamp Outputs

r
The amplifier has a set of preamp outputs. The signal from the source
selected with the Function Selector 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
NOTE: Changes to the settings of the Volume, Balance or Tone controls
affect the signal from the Preamp Outputs.

Speaker Outputs

ui

Speaker Selector Switch

[See Figure 2 .]
The amplifier has two sets of speaker outputs, labeled "A"
i .The speaker outputs are controlled by the switch
panel.

Speaker Selection

If only one set of speakers will be used at any given time, the speakers may
have an impedance 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 loudspeakers will present any problems for the unit.
See your authorized Rotel dealer if you have any questions.

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the unit 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 – 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 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 amplifier
connection.
ty
6
u
6
on the front
9
and "B"