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Installation Instructions G5 - Revision C, September 2019
3M™ Drive-Thru System Model G5
W. 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 Basestation to a
specific site this level must be precisely set.
To change the microphone preamp gain:
• Look up the microphone’s output level at 1kHz sensitivity (see the microphone’s specifications).
• Enter the configuration mode, see page 37.
• Select a new value for 01 Drive-thru Volume > Mic Preamp Gain. The range is 0 to 20. Use the table below to determine the correct
setting.
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 Basestation should be 8.
Due to slight microphone variability and cable impedance, you may need to adjust the gain level setting by 1 or 2 dBs.
X. Installer Access
The default installer passcode is 12345.
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
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