5
2 CH MODE.
BRIDGE MODE.
When the MODE SWITCH
of the XA are set to 2 CH operation,
simply connect the wires from L
loudspeakers to the L sides of speaker
terminal blocks (marked - and +) of CH A
& CH B and R loudspeakers to the R
sides of speaker terminal blocks (marked
- and +) of CH A & CH B. Make sure that
the red terminal on each loudspeaker is
connected to the corresponding +
terminal on each speaker terminal block
and likewise for the black terminal on
each loudspeaker to each - terminal on
each speaker terminal block .
When the MODE
SWITCHES are set to BRIDGE mode
operation, only the + terminals on the
speaker terminal blocks of XA are used.
For this mode of operation, connect the
red terminal of the right speaker to the L+
terminal of CH A speaker terminal block
and the black speaker terminal to the R+
terminal of CH A speaker terminal block.
The left speaker is connected in a similar
way, where the red terminal of the
speaker is connected to the L+ terminal
of CH B speaker terminal block and the
black terminal of the speaker is
connected to the R+ terminal of CH B
speaker terminal block.
NOTE: The XA amplifier is normally used
in Bridge or 2 CH modes for both CH A
and CH B. However, it can also can be
set to operate as CH A for 2CH and CH B
for bridge mode. So the XA will be
capable of driving one 8 ohm loudspeaker
at 90 watts and two 4 ohm loudspeakers
at greater than 45 watts per channel.
Typical applications include,
satellite/subwoofer systems and Dolby
surround sound decoder systems. To set
the XA in this mode of operation, please
consult your AMC dealer.
7. AUDIO SENSE/TRIGGER/CONSTANT
SWITCH
The remote power switch is located on
the back panel of the AMC XA and
provides the following functions;
When the remote power
switch is set in the AUDIO SENSE
position, the XA is turned on or off
automatically, depending on the audio
signal level at the inputs. With an audio
signal greater than 10 mV at any of the
four stereo inputs of XA, the amplifier will
automatically turn on. If the signal level
drops below this level, the amplifier will
remain on for a period of approximately 5
minutes before it automatically reverts to
standby mode.
Please note that when AC power is first
applied to the XA while the remote power
switch is in the AUDIO SENSE position,
the amplifier will automatically turn on,
even without an audio signal being
present at any of the audio inputs.
However, after approximately 5 minutes,
the amplifier will revert to standby mode,
assuming no signals are present at any of
the inputs.
When the remote power
switch is set in the TRIGGER position,
the AMC XA can be turned on
automatically by an external trigger
voltage. The trigger voltage is applied to
the trigger input socket, located on the
back panel of the XA.. This trigger voltage
can originate from a system controller or
from another XA. The sensitivity of this
input ranges from +3Vdc to +30Vdc and
will also accept AC voltages over the
same range. The current required from
the trigger source is only 0.2mA.
The XA is also provided with a trigger
output socket, also located on the back
panel. When the XA is turned on, the
trigger output socket provides a +12Vdc
signal that can be looped through or
"daisy-chained" to the trigger input of
another XA amplifier (or other
component) in a multi component
installation. When the external trigger
voltage is set to 0V, the XA will be in
standby mode and the voltage from the
AUDIO SENSE.
TRIGGER.
