Audio Fix / setup help

Bose QuietComfort Ultra Headphones 2nd Gen: leave the AUX cable route before reconnecting Bluetooth

Bose QuietComfort Ultra Headphones 2nd Gen — leave the AUX cable route before reconnecting Bluetooth. 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 Ultra Headphones 2nd Gen. Exact Bose QuietComfort Ultra Headphones 2nd Gen is powered on and charged, but its AUX cable remains inserted while you want the already-paired Bluetooth source. No firmware update is active, and no USB cable is attached.

Connection scope: Bluetooth. Symptom: Sound goes to the wrong output.

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 Bose QuietComfort Ultra Headphones 2nd Gen is powered on and charged, but its AUX cable remains inserted while you want the already-paired Bluetooth source. No firmware update is active, and no USB cable is attached.

Look for: Confirm this exact setup and observation before continuing.

  • Manufacturer-documented Bose QuietComfort Ultra Headphones 2nd Gen — official bose ultra2 wired power 25 ↗Exact 2nd Gen Owner’s Guide pp 14–16,33–34 and38 — Normal power-on is a press/release, unlike held pairing controls. AUX disables Bluetooth and earcup microphones and needs power. USB audio is supported: with USB connected, a press/release switches between Bluetooth and USB Audio voice indications.Exact Bose QuietComfort Ultra Headphones 2nd Gen. · Source checked 2026-11-09

accept-route

Accept interrupting the analog route?

Removing this AUX cable disconnects the wired programme and its available cable-call path. Continue only if you intend to leave that route and accept the interruption.

Look for: Explicit informed acceptance is required before the next action.

  • Manufacturer-documented Bose QuietComfort Ultra Headphones 2nd Gen — official bose ultra2 wired power 25 ↗Exact 2nd Gen Owner’s Guide pp 14–16,33–34 and38 — Normal power-on is a press/release, unlike held pairing controls. AUX disables Bluetooth and earcup microphones and needs power. USB audio is supported: with USB connected, a press/release switches between Bluetooth and USB Audio voice indications.Exact Bose QuietComfort Ultra Headphones 2nd Gen. · Source checked 2026-11-09

a1

Pause the wired programme

Pause the analog source; confirm no call or active listening session depends on this cable.

Look for: Observe the named indication or available control; stop if absent.

  • Manufacturer-documented Bose QuietComfort Ultra Headphones 2nd Gen — official bose ultra2 wired power 25 ↗Exact 2nd Gen Owner’s Guide pp 14–16,33–34 and38 — Normal power-on is a press/release, unlike held pairing controls. AUX disables Bluetooth and earcup microphones and needs power. USB audio is supported: with USB connected, a press/release switches between Bluetooth and USB Audio voice indications.Exact Bose QuietComfort Ultra Headphones 2nd Gen. · Source checked 2026-11-09

a2

Remove the AUX plug from the headset

Holding the plug body, disconnect the analog cable from the headset earcup input. Bluetooth is disabled while this cable remains attached.

Look for: Observe the named indication or available control; stop if absent.

  • Manufacturer-documented Bose QuietComfort Ultra Headphones 2nd Gen — official bose ultra2 wired power 25 ↗Exact 2nd Gen Owner’s Guide pp 14–16,33–34 and38 — Normal power-on is a press/release, unlike held pairing controls. AUX disables Bluetooth and earcup microphones and needs power. USB audio is supported: with USB connected, a press/release switches between Bluetooth and USB Audio voice indications.Exact Bose QuietComfort Ultra Headphones 2nd Gen. · Source checked 2026-11-09

a3

Select the existing Bluetooth connection

With the headset already on, select its already-paired exact model entry on the intended nearby source. Do not delete pairing records or enter discovery.

Look for: Observe the named indication or available control; stop if absent.

  • Manufacturer-documented Bose QuietComfort Ultra Headphones 2nd Gen — official bose ultra2 wired power 25 ↗Exact 2nd Gen Owner’s Guide pp 14–16,33–34 and38 — Normal power-on is a press/release, unlike held pairing controls. AUX disables Bluetooth and earcup microphones and needs power. USB audio is supported: with USB connected, a press/release switches between Bluetooth and USB Audio voice indications.Exact Bose QuietComfort Ultra Headphones 2nd Gen. · Source checked 2026-11-09

a4

Play the intended source quietly

Start the intended Bluetooth media at a comfortable low volume.

Look for: Observe the named indication or available control; stop if absent.

  • Manufacturer-documented Bose QuietComfort Ultra Headphones 2nd Gen — official bose ultra2 wired power 25 ↗Exact 2nd Gen Owner’s Guide pp 14–16,33–34 and38 — Normal power-on is a press/release, unlike held pairing controls. AUX disables Bluetooth and earcup microphones and needs power. USB audio is supported: with USB connected, a press/release switches between Bluetooth and USB Audio voice indications.Exact Bose QuietComfort Ultra Headphones 2nd Gen. · Source checked 2026-11-09

observe

Check the result

Is the intended Bluetooth source now audible with AUX removed?

Look for: Confirm this exact setup and observation before continuing.

  • Manufacturer-documented Bose QuietComfort Ultra Headphones 2nd Gen — official bose ultra2 wired power 25 ↗Exact 2nd Gen Owner’s Guide pp 14–16,33–34 and38 — Normal power-on is a press/release, unlike held pairing controls. AUX disables Bluetooth and earcup microphones and needs power. USB audio is supported: with USB connected, a press/release switches between Bluetooth and USB Audio voice indications.Exact Bose QuietComfort Ultra Headphones 2nd Gen. · 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.

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