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Configuration
March 2014 – Revision 2.0
Page 54 of 74
3M™ Drive-Thru Systems Model G5 and Model XT-1
Installation Manual
Change the Microphone Preamp Gain
The Mic Preamp Gain is the first stage of amplification from the microphone in
the order point. In order to optimize the base station to a specific site this level
must be precisely set.
To change the microphone preamp gain:
•
Lookup the microphone’s output level at 1kHz sensitivity (see the
microphone’s specifications).
•
Enter the configuration mode, see page 35.
•
Select a new value for
01 Drivethru Volume
>
Mic Preamp
Gain
. The range is 0 to 20. Use the table below to determine the
correct setting.
Microphone Output Level
Setting
Microphone Output Level
Setting
-63 dB
0
-74 dB
11
-64 dB
1
-75 dB
12
-65 dB
2
-76 dB
13
-66 dB
3
-77 dB
14
-67 dB
4
-78 dB
15
-68 dB
5
-79 dB
16
-69 dB
6
-80 dB
17
-70 dB
7
-83 dB
18
-71 dB
8
-84 dB
19
-72 dB
9
-85 dB
20
-73 dB
10
For example, according to its specifications, the 3M™ Duplex Microphone (78-
6911-4935-1) has an output level of -71dB at 1 kHz. According to the table, the
setting in the base station should be 8.
Note:
Due to slight microphone variability and cable impedance, you may need to
adjust the gain level setting by 1 or 2 dBs.
Installer Access
The default installer passcode is 12345.