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Operation
2-3
Manual Use of the FM-15 Ambient Level Controller
The FM-15 ALC may be used without the FM-14 Log Current Microphone.
In this mode, the FM-15 ALC becomes a leveler or limiter for manual control
of the sound system. The SPL meter will not function but all other functions
will work in the normal manner. The Manual Level Control on the front panel
will set the level of the sound system (see Figure 2-1).
Figure 2-2. FM-15 ALC Rear View
Line Output Enable
Output Level Control
Minus 12dB Jumper
J6
-12 dB
TOP VIEW
Telco In
Loop Start
Line In
C1 G
+ -
Output
Level
Line Out
+ - C1 C
Mic Only
Shield
Line In Enable Line Output Enable
Output Level Control
Minus 12dB Jumper
J6
-12 dB
TOP VIEW
Telco In
Loop Start
Line In
C1 G
+ -
Output
Level
Line Out
+ - C1 C
Mic Only
Shield
Line In Enable Line Output Enable
Output Level Control
Minus 12dB Jumper
J6
-12 dB
TOP VIEW
Telco In
Loop Start
Line In
C1 G
+ -
Output
Level
Line Out
+ - C1 C
Mic Only
Shield
Line In Enable Line Output Enable
Output Level Control
Minus 12dB Jumper
J6
-12 dB
TOP VIEW
Telco In
Loop Start
Line In
C1 G
+ -
Output
Level
Line Out
+ - C1 C
Mic Only
Shield
Line In Enable
The Output Level Control (see Figure 2-2) is preset at the factory for a 0 dB
maximum output level. The Enable Contacts (see Figure 2-2) on the Line
Input terminal strip, when shorted with a DRY contact closure, will produce
an isolated DRY contact closure on the C1 and C terminals of the Line
Output terminal strip.