OPERATING INSTRUCTIONS
1) Connect the LE8 into the Modular Audio Processor system as described above in the Installation section.
2) On the AC1 Main module, note the position of the THRESHOLD control and then turn the THRESHOLD control
fully clockwise. This will prevent multiple microphones from turning on during the adjustment procedure.
3) On all of the AP4 or EP4 Mic Preamp modules in the system, set the PRIORITY/AUTO/DIRECT switch on all
channels to AUTO, except the microphone to be equalized. Set this microphone to DIRECT. The Active Logic
Input LED on the LE8 corresponding to that microphone should light.
4) On the front panel of the LE8, set the ACTIVE/BYPASS switch to ACTIVE, and the OPERATE/NEW SETTING
switch to NEW SETTING.
5) Press the TREBLE button, and adjust the Treble response as appropriate using the ADJUST control. To store
this setting to permanent memory, press the STORE SETTING button. The Treble LED will blink once to
indicate that the Treble value has been saved. The same procedure may be used to adjust and save the other
three bands of equalization. The LE8 "remembers" any adjustments made in the New Setting mode, even if
they are not saved to permanent memory, until the power is turned off. This allows adjustments to be made to
all bands as many times as is necessary to achieve proper equalization. Only the final equalization values need
to be saved by pressing the STORE SETTING buttons for each filter value while the LE8 is in the NEW
SETTING mode.
6) After the microphone has been equalized, Notch Filters 1, 2, and 3 may be used to minimize feedback and
ringing problems associated with the microphone. Press the NOTCH FILTER 1 button, and increase system
gain (using the MAIN LEVEL CONTROL on the AC1) until feedback is encountered. Adjust the frequency of the
notch filter until the feedback subsides. Press the STORE SETTING button to save the setting. The Notch 1
LED will blink once to indicate that the value has been saved. Repeat this process (if desired) for Notch Filters
2 and 3.
PRIORITY RANK 1 PRIORITY RANK 2 PRIORITY RANK 3
EXAMPLE
LINK IN/OUT
and
LOGIC INPUT
CONNECTIONS
+
-
LOGIC IN 8
+
-
LOGIC IN 7
+
-
LOGIC IN 6
+
-
LOGIC IN 5
+
-
LOGIC IN 4
+
-
LOGIC IN 3
+
-
LOGIC IN 2
LOGIC IN 1
-
+
AUDIO PROCESSOR.
OUTPUT
THRU
INPUT
LE8
LINK OUT
LINK IN
12
3
3
1 2
3
1 2
FROM AP4 LOGIC OUT +
FROM AP4 LOCIC OUT -
+
-
LOGIC IN 8
+
-
LOGIC IN 7
+
-
LOGIC IN 6
+
-
LOGIC IN 5
+
-
LOGIC IN 4
+
-
LOGIC IN 3
+
-
LOGIC IN 2
LOGIC IN 1
-
+
AUDIO PROCESSOR.
OUTPUT
THRU
INPUT
LE8
LINK OUT
LINK IN
12
3
3
1 2
3
1 2
+
-
LOGIC IN 8
+
-
LOGIC IN 7
+
-
LOGIC IN 6
+
-
LOGIC IN 5
+
-
LOGIC IN 4
+
-
LOGIC IN 3
+
-
LOGIC IN 2
LOGIC IN 1
-
+
AUDIO PROCESSOR.
OUTPUT
THRU
INPUT
LE8
LINK OUT
LINK IN
12
3
3
1 2
3
1 2
LE8 #1 LE8 #2 LAST LE8
Figure 8 - Linking Multiple LE8s
7
(6 pages)
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