LM-2 Installation Guide v1.0 9
LM-2 Priority Operation
If the MIC PRIORITY button on the LM-2 faceplate is not pressed, mic and/or line signals connected at the module will be
routed to the Zone to whose Facility Port the LM-2 is wired, and heard through the audio system at volumes which can be
controlled from the MIC LEVEL and MUSIC LEVEL controls on the faceplate. These locally-connected signals will be mixed
within the host unit with any background music currently selected for that zone.
Mic priority:
The LM-2’s Priority facility has two modes of operation, selected by jumpers on the upper rear PCB. The default mode operates
thus: with MIC PRIORITY pressed, a signal at the microphone input will cause the line input signal connected at the same module
to “duck” by 30 dB, giving the speaker priority over the music. The attack time (how quickly the music level drops when the mic
is used) and release time (how quickly it recovers after the mic signal stops) are pre-set, and optimised for best audible results.
The priority control signal is also sent to the host unit, where it additionally “ducks” whichever Line Input is currently selected
in the Zone. Thus the LM-2 mic input has priority over both local and global music sources.
It is important to note that any Priority functions set within the host unit – e.g., Line 6 Priority or Paging – will operate as
normal. However, if Line 6 Priority is selected and active, the Line 6 source will still be ducked by the LM-2’s Mic Priority.
Full priority:
LM-2 UPPER PCB
J1
J3
J2
J4
LOCATION OF JUMPERS
LINK
LINK
Link indicates default jumper setting
LOCAL
LOCAL
LM-2 MIC MIC MAX
If jumpers J2 and J4 are moved from their default settings to the alternative setting, Priority operation changes. When MIC
PRIORITY is pressed, the module’s summed output is used to derive the priority control signal that is sent back to the host
unit, and the signal is at the voltage required by the host unit to fully mute the background music.
The result is that a signal at either the LM-2’s mic input or line input will fully mute the selected Line Input at the host unit, and
thus any source connected at the LM-2 will take full priority over the Zone’s background music.
As with the default mode, any priority functions set within the host unit itself will still operate normally, though if Line 6 priority
is selected and active, the Line 6 source will be overridden by the LM-2 Priority.
MODE J2 J4
PRIORITY
SOURCE
BACKGROUND
MUSIC
Mic
Priority
MIC MIC LM-2 mic input 30 dB ducking
Full
Priority
LM-2 MAX
Sum of LM-2 mic
input and line input
Full muting
(17 pages)
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