Lexicon LX-7 User Manual page 15

LX Power Amplifiers
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 the 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.
Do not defeat or remove the ground prong on the AC power
WARNING
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.
6. UNBAL/BAL Switch
Selects between the 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, 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 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 powered off, then on again.
Basic Operation
2-7