User Manual
Table Of Contents
- About your Bose® A20® Aviation Headset
- Components
- Preparing the Headset for Use11
- The battery compartment
- Connecting the headset to the aircraft
- Wearing and adjusting the headset
- Using the control module
- Primary and secondary audio sources
- AUX audio sources (wired)
- Bluetooth® audio sources (wireless)
- Using the headset with a Bluetooth® device
- Pairing the first device
- Pairing another device
- Switching between connected devices
- Bluetooth multi-function button
- Making and answering calls
- Reconnecting to a previously connected device
- Recovering a lost connection
- Disconnecting a Bluetooth device
- Clearing the headset pairing list
- Controlling Bluetooth volume
- Using the headset with a Bluetooth® device
- Secondary audio modes
- Cleaning the headset
- Instructions for continued airworthiness
- Managing multiple secondary sources
- Ordering parts and accessories
- Contact information
- Limited warranty
- Locating the headset serial number
- Mounting the aircraft panel connector
- Replacing parts
- Microphone windscreen

Using the Headset
English - 17
Microphone placement
Microphone placement is important for clear communications. With the headset on
your head, make these adjustments:
1. Grasp the boom with your fingers and move the microphone up or down so it
is level with your mouth.
2. Pull the microphone in toward your lips. Position the microphone with its talk
side facing in (indicated by label). Though it will be slightly off center, the
microphone should be 1/2 inch from the opening of your lips.
Mic is 1/2 inch
from mouth
Mic label
3. Make sure the talk side of the microphone is facing your lips. Do not purse
your lips.
Clothing clips
The control module cable is fitted with two clothing clips. Use the clips to attach
the headset cable to your clothing, a safety harness, or an aircraft door pocket.
Press to release and reposition
clip along the cable
Press to open clip