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Low audio | Bose A20 Aviation Headset
If the issue only occurs with a device connected to the auxiliary input, here are some suggestions.
Try the following:
Check the EQ settings of the connected device.
Many devices (i.e. smartphones, tablets, laptops, etc.) have audio adjustments, like Bass, Treble or Loudness. In the device menu, look for audio or sound options. The, turn off or select the neutral setting for any related adjustments. This allows your Bose product to apply it's own audio processing. After, if you want to adjust audio further with the device audio options, try small adjustments.
Replace the cables used to connect your product
Try replacing the cables that connect your product. If no issue is heard with new cables, the first set of cables is the issue.
If connected, bypass any adapters or extension cables.
If your product connects to the device using an extension cable or adapter, disconnect the extension cable or adapter to determine if the issue is related to it.
Try a different audio source.
Connect another audio device (i.e. music player or GPS) to determine if the issue is with that particular device.
Try connecting a different audio device.
If available, connect another audio device using the same cables and connections to determine if the issue is related to the first device or its settings.
Determine if any recent changes have been made to the headset or aircraft.
If any changes or modifications have been made to either the headset or the aircraft, look into whether or not those changes could have unexpectedly caused this issue.
Determine if the issue occurs with a connected auxiliary device.
Put the audio selector switch on the headset control module in either the middle or top position. (Be sure it is not in the down / Intercom Only position.) Then, disconnect the headset from the panel and connect an audio device to the 3.5 mm aux input on the headset control module. If you have a headset with Bluetooth®, you can connect a Bluetooth device instead: If the issue still occurs with the aux device, there is an issue with the headset; if the issue is not present with the aux device, the issue is related to the panel settings or connections.
Be sure the headphone openings are clean and free of debris.
Check for blockages in the headphone mesh grille and headphone opening. Excessive debris can result in low audio, poor sound quality or missing audio channels.
Be sure the headset scrims are clean and free of debris.
Check for blockages in the scrim (the cloth grille inside earcup opening). Excessive debris can result in low audio or poor sound quality.
Connect the headset to a different panel jack or, if possible, to another aircraft.
Non-TSO equipment, worn jacks/loose connections, or incorrectly wired jacks (i.e. reversed stereo or mic / ground wires) in the aircraft can cause issues. If available, try connecting the headset to another jack in the aircraft or to jacks in a separate aircraft. If the headset works fine when connected elsewhere, the panel jack or wiring to the jack is the issue.
Plug in a different headset.
If available, connect a different headset to the aircraft to determine if the issue is related to the aircraft panel or its settings.
Disconnect all other headsets connected to the aircraft.
Unplug any other headsets connected to the aircraft intercom. If the issue goes away, it is related to another headset. Reconnect the headsets one-by-one to determine which, then check the settings for that headset.
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