Audio Fix / setup help
Bose QuietComfort Headphones: complete a visibly loose original AUX source connection
Bose QuietComfort Headphones — complete a visibly loose original AUX source connection. Use the stated exact hardware and connection scope.
Manufacturer-documented Reviewed 2026-11-09 · Revision 1
Follow these checks in Audio Fix →When this guide applies
Exact Bose QuietComfort Headphones. Exact original QuietComfort Headphones with the supplied 2.5-to3.5 mm inline-microphone cable and one visibly incomplete external plug. The source is a positively identified compatible stereo headphone output; no balanced adapter or unknown jack is involved.
Connection scope: Analog line / headphone audio. Symptom: There is no playback sound.
This is a documented check, not a diagnosis of your equipment. The model name does not confirm the selected input, mode, software or connected partner.
If your exact model or a required setting is unknown, use the “I don’t know” branch below. Do not apply a similarly named model’s instructions.
Checks and possible outcomes
Start at scope. Follow the link that matches what you actually observe. Alternative branches are not a single sequence of actions.
scope
Confirm the model and connection
Exact original QuietComfort Headphones with the supplied 2.5-to3.5 mm inline-microphone cable and one visibly incomplete external plug. The source is a positively identified compatible stereo headphone output; no balanced adapter or unknown jack is involved.
Look for: Confirm this exact setup and observation before continuing.
- If Yes, I confirm → Pause the source
- If No / my setup differs → Continue with source and model support
- If I cannot confirm → More information is required
- Manufacturer-documented Bose QuietComfort Headphones — official bose qc wired power 25 ↗Original QuietComfort Headphones Owner’s Guide pp 13–14,27,30 and41 — Power-on uses the normal right-hand switch position. AUX2.5-to3.5 mm cable disables Bluetooth and earcup microphones; USB charging also prevents playback/app use. The original QC cable includes an inline microphone, unlike Ultra2’s described cable.Exact Bose QuietComfort Headphones. · Source checked 2026-11-09
a1
Pause the source
Pause the connected analog source before touching the cable.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Lower source volume
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented Bose QuietComfort Headphones — official bose qc wired power 25 ↗Original QuietComfort Headphones Owner’s Guide pp 13–14,27,30 and41 — Power-on uses the normal right-hand switch position. AUX2.5-to3.5 mm cable disables Bluetooth and earcup microphones; USB charging also prevents playback/app use. The original QC cable includes an inline microphone, unlike Ultra2’s described cable.Exact Bose QuietComfort Headphones. · Source checked 2026-11-09
a2
Lower source volume
Set its ordinary headphone output to minimum.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Identify the original cable orientation
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented Bose QuietComfort Headphones — official bose qc wired power 25 ↗Original QuietComfort Headphones Owner’s Guide pp 13–14,27,30 and41 — Power-on uses the normal right-hand switch position. AUX2.5-to3.5 mm cable disables Bluetooth and earcup microphones; USB charging also prevents playback/app use. The original QC cable includes an inline microphone, unlike Ultra2’s described cable.Exact Bose QuietComfort Headphones. · Source checked 2026-11-09
a3
Identify the original cable orientation
Use the original inline-microphone cable:2.5 mm end at the left earcup and3.5 mm end at the identified ordinary headphone source. Do not use USB as an audio input.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Complete the visibly loose plug connection
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented Bose QuietComfort Headphones — official bose qc wired power 25 ↗Original QuietComfort Headphones Owner’s Guide pp 13–14,27,30 and41 — Power-on uses the normal right-hand switch position. AUX2.5-to3.5 mm cable disables Bluetooth and earcup microphones; USB charging also prevents playback/app use. The original QC cable includes an inline microphone, unlike Ultra2’s described cable.Exact Bose QuietComfort Headphones. · Source checked 2026-11-09
a4
Complete the visibly loose plug connection
Gently seat only the visibly incomplete external plug in its correct port. Do not disturb a fully seated connection or force a damaged connector.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Resume quietly from the source
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented Bose QuietComfort Headphones — official bose qc wired power 25 ↗Original QuietComfort Headphones Owner’s Guide pp 13–14,27,30 and41 — Power-on uses the normal right-hand switch position. AUX2.5-to3.5 mm cable disables Bluetooth and earcup microphones; USB charging also prevents playback/app use. The original QC cable includes an inline microphone, unlike Ultra2’s described cable.Exact Bose QuietComfort Headphones. · Source checked 2026-11-09
a5
Resume quietly from the source
Resume familiar material using the source’s media controls and a quiet output level.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Check the result
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented Bose QuietComfort Headphones — official bose qc wired power 25 ↗Original QuietComfort Headphones Owner’s Guide pp 13–14,27,30 and41 — Power-on uses the normal right-hand switch position. AUX2.5-to3.5 mm cable disables Bluetooth and earcup microphones; USB charging also prevents playback/app use. The original QC cable includes an inline microphone, unlike Ultra2’s described cable.Exact Bose QuietComfort Headphones. · Source checked 2026-11-09
observe
Check the result
Is the same source now audible through the completed AUX connection?
Look for: Confirm this exact setup and observation before continuing.
- If Yes, I confirm → Checks completed
- If No / my setup differs → Continue with source and model support
- If I cannot confirm → More information is required
- Manufacturer-documented Bose QuietComfort Headphones — official bose qc wired power 25 ↗Original QuietComfort Headphones Owner’s Guide pp 13–14,27,30 and41 — Power-on uses the normal right-hand switch position. AUX2.5-to3.5 mm cable disables Bluetooth and earcup microphones; USB charging also prevents playback/app use. The original QC cable includes an inline microphone, unlike Ultra2’s described cable.Exact Bose QuietComfort Headphones. · Source checked 2026-11-09
Possible result
More information is required
An unknown state is not a diagnosis. Record the last visible indication and consult the exact model instructions.
insufficient data
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.
Possible result
Continue with source and model support
Keep the source, connection and last observation. Do not reset, open equipment or change full-scale output to compensate for an unconfirmed result.
next support
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.
Possible result
Checks completed
The requested observation was confirmed in this setup. It does not establish a hardware repair or guarantee another source behaves the same.
steps completed
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.