Basic Operation
LX Power Amplifiers
2-7
5. MODE Switch
(continued from page 2-5)
Make sure the amplifier is powered off when the MODE switch
setting is changed.
INPUTs and OUTPUTs used in (BRIDGED) mode are labelled in
parenthesis. Do not use other INPUTs and OUTPUTs that are
not labelled in parenthesis. Connect the positive speaker lead
to the positive (red) OUTPUT of the first channel, and
connect the negative speaker lead to the positive (red)
OUTPUT of the second channel.
6. UNBAL/BAL Switch
Selects between unbalanced (RCA) or balanced (XLR, tip/ring/
sleeve) audio input for each channel. Power the amplifier off or
reduce system volume before changing the setting of the
UNBAL/BAL switch. If the amplifier is connected to a digital
controller such as the MC-12 or MC-8, output levels should be
re-calibrated whenever the setting is changed.
7. GROUND LIFT Switch
When set to ON, isolates the ground connection between the
audio inputs and the chassis. This can be useful for
eliminating audible hum or noise caused by multiple
grounding paths in the system. When set to OFF, the audio
inputs are grounded to the chassis. This switch should be set to
ON whenever there is ground noise present in the system.
8. TRIGGER INPUT
Enables the amplifier to be controlled by the MC-12/MC-8 or
other external devices with a 12V DC trigger output. Connect
the trigger output of the external device to the TRIGGER INPUT
of the amplifer, and set the TRIGGER switch on the amplifier to
ON or DELAY. The amplifier will automatically respond when
the external device is powered on and off.
9. TRIGGER INPUT Switch
When set to OFF, the amplifier only powers on and off in
response to the front panel standby button. When set to ON
or DELAY, only the external device connected to the TRIGGER
INPUT can be used to power the amplifier on and off. The front
panel standby button will not power the unit on and off.
(However, the standby LED still functions normally.) When set
to DELAY, the normal 5 second power on delay is extended to
approximately 7 seconds.
The TRIGGER INPUT Switch setting will not take effect until the
amplifier has been power cycled.
Do not defeat or remove the ground prong on the AC
power cord. This will result in a safety hazard, and will not
reduce audible hum. The GROUND LIFT switch has no
effect on the safety ground of the amplifier.
WARNING
