DoorKing 1838 Multi-Door Access Controller - Manual (Page 40)

Note: 3.8.4 is applicable only if a Remote Call Station is connected to the 1838 controller.
3.8.4 Speaker Volume, Microphone and Feedback
Speaker volume, microphone volume and feedback all interact with each other to affect the audio
performance of the system. Use the following steps to set these adjustments.
1. Open the 1838 controller and locate the speaker volume, microphone volume and
feedback adjustments (see page 34).
2. Set the speaker volume about 1/3 from full counter-clockwise.
3. Set the microphone volume to 1/2.
4. Place a phone call from Remote Call Station. If feedback occurs, turn the speaker
volume counter-clockwise until it ceases.
5. While still on the line, ask the other party to remain silent while rubbing your finger over
the microphone hole on the face plate. Rotate the feedback adjustment throughout its
range while listening to the sound coming from the speaker. When the sound is
minimum, this is the correct setting.
6. Speaker volume and microphone volume may now be adjusted to desired levels. If both
are set too loud, feedback may result. For louder speaker volume, the microphone
volume may need to be decreased. For louder microphone volume, the speaker volume
may need to be decreased.
7. Normal setting for both speaker volume and microphone volume is about 1/2.
8. After setting these adjustments, place some test calls. If feedback occurs, microphone
and/or speaker volume will need to be reduced.
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