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6.0 E-4 System Setup
Input gain setup sequence
1.
Set
Source Leveling
to
Off
. This allows you make the initial
gain setting.
2.
Select the source
Type
and determine if Mic Power +12V is
needed. Set
Mic Power
to
On
if required. Leave it in the
Off
setting if you are using line inputs.
3.
Start your input source and monitor its signal on the gain
signal level meter. If the level is green, go to step 4. If the
level is yellow, increase the input gain until the level is green.
Likewise, if the level is red, reduce the input gain until the
level is green.
Programmer’s Note:
You may have to repeat step 3 a
few times if the input source is a CD player. The output
level of a CD player varies based on the program material.
4.
Set
Source Leveling
to
On
. If you are using a source that
produces a varying output level due to program material,
such as a CD player, Source Leveling will compensate for
these variances. If your system will be switching between
multiple sources, Source Leveling will compensate for vari-
ances between the different sources.
5.
Repeat steps 1 to 4 for the remaining system inputs.
When you turn Source Leveling on, you should only hear a small
change in volume. If you hear a large increase, raise the input
gain. Likewise, if you hear a large decrease, lower the input gain.
Input gain controls
Type
– This setting determines the initial gain and amount of gain
available for the input signal. The following table lists the choices
for each input line.
Mic power +12V
– This setting enables/di12V phantom
power only for inputs 3 and 4, which are capable of accepting
microphone signals. This power source is used for condenser
type microphones.
Gain slider
– Click and drag the gain slider up/down to set the
input gain. Changes in the slider's position are continuously sent
to the E-4 hardware so you will hear the change in gain as it is
applied and see the change in the signal level on the meter. The
gain range is dependent on the
Type
setting: 80 dB for Mic; 60 dB
for Line.
Programmer’s Note:
When setting up the system,
adjust the input gain slider until the meter is green.
Occaisional flashes of red are acceptable.
Input gain meter
– The input gain meter indicates the average
input signal level of the hardware. The meter is divided into three
color segments:
Amber = Low signal level
Green = Good signal level
Red = High signal level
Signal present indicator
– The signal present indicator tells you
if a signal is being received by the hardware:
Inactive = No signal
Green = Good signal
Red = Signal clipping
Source Leveling
– The Source Leveling controls allow you to
turn this feature on and off. When on, Source Leveling automati-
cally manages the input gain level so that the full output of the
amplifier can be achieved. It does this by adjusting the input sig-
nal level to obtain the desired amplifier input signal level (+11
dBV). When setting the initial input gain level, check to make sure
that Source Leveling is
Off
. If you do not see this setting in the
control pane, click on
More
to display the Source Leveling On/
Off switch.
Programmer’s Note:
The Source Leveling setting
cannot be changed when the Opti-Voice
®
paging
system is on.
Input Line
Input Type(s) Selection
Initial Gain
LINE 1
Line
0
LINE 2
Line
0
AUX MIC/
LINE 3
Line (default)
Mic
0
40
PAGE/MIC/
LINE 4
Line
Mic
Line Page
Mic Page (default)
0
40
0
40