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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.
Speaker Connection
Turn off all the components in the system before connecting the speakers.
The amplifier has color-coded binding post type speaker connectors on the
back panel. These connectors accept bare wire, connector lugs, or dual
banana type connectors. (Except in European Community countries where
their use is not permitted.)
Route the wire from the amplifier to the speakers. 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 counterclockwise) the binding post
thumbscrews. Place the connector lug or wire around the binding post
shaft. Turn the thumbscrews clockwise 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.
Headphone Output 4
The headphone output allows you to connect headphones for private listening.
This output accepts a standard 3.5mm (1/8") mini stereo headphone
connector. Plugging in a set of headphones does not cut off the signal to the
speakers. Use the front panel
5
buttons to turn off the speakers.
NOTE: Because the sensitivity of speakers and headphones can
vary widely, always reduce the volume level before connecting or
disconnecting headphones.
Display 6
The front panel display shows the source selected, volume level and tone
settings. The display provides access to the setup and configuration menu
options of the amplifier.
Front USB Input 3
The front USB input can be connected to an iPhone, iPad or iPod device
providing music playback to the amplifier. To enable audio playback using
one of these devices simply plug the device into the front USB and select
USB as the desired source. The device will remain active allowing search
and play functions.
J
or remote control
A-B speaker selector
APTX Bluetooth Connection e
e
The Bluetooth Antenna
on the unit's back panel is for wireless streaming
via Bluetooth, from your device (i.e. mobile phones, tablets or computers).
From your device, look for "Rotel Bluetooth" and connect to it. Connection
is normally automatic, but if prompted for a password, please enter "0000"
on your device. The unit supports both traditional Bluetooth and APTX
Bluetooth audio streaming.
Rear USB Power Port o
The rear USB port provides 5V/0.5A for charging or powering USB devices
including streaming music players. This port does not allow playback of audio.
The port can be configured to remain powered even when the A12 is in
standby mode through the front panel setup menu (See USB POWER option
on page 15).
This configuration option allows the attached streaming source to remain
powered for use with the Signal Sense function for automatic power on/
off control of the amplifier.
NOTE: When configured to provide continuous power to the rear
panel USB port the A12 will consume additional power even when in
standby mode.
Audio Controls
Volume Control 7 E
Turn the control clockwise to increase the volume, or counter clockwise to
decrease the volume. From the remote control press the volume + or - button
to turn the volume up or down. Press the MUTE
mute the volume.
Balance Control 9 B
The Balance Control adjusts the left-to-right balance of the sound output. The
factory default is the center position or "0". To change the balance from
the front panel, press the MENU
BALANCE SETTING mode. Then press the - or + buttons on the front panel to
change the value to LEFT or RIGHT. The value can change from L15 to R15.
NOTE: This setting is saved permanently including after powering off
the A12.
To make temporary changes not saved after power off, from the remote,
press the BAL
B
button to access the BALANCE SETTING menu, then press
the up/down/left/right
arrow buttons to adjust.
C
Tone Control Bypass 9 B
Bass and Treble Control (Tone Control) circuits are bypassed at factory
default to ensure the purest possible sound. The front display will show
TONE BYPASS. To turn on the tone control from the front panel, press the
MENU
9
button to toggle to the Bypass control then press the - or + buttons
to turn bypass on or off.
NOTE: This setting is saved permanently including after powering off
the A12.
To temporarily changes the Tone Control Bypass, press the BYPASS
on the remote control to toggle the Bypass mode enabled and disabled.
F
button to completely
9
button to toggle the front display to
B
13
button
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