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Fix Bluetooth headphones switching to mono on Windows 11

Keep Bluetooth headphones in stereo on Windows 11 25H2 by disabling the Hands-Free profile and forcing the A2DP endpoint.

by@guidox updated:10/26/26 time:10 min level:Beginner works on:Windows 11 25H2
TL;DR

Disable the **Hands-Free** service on the headset in **Devices and Printers** so Windows cannot fall back to the mono **HFP** profile.

Before you start

Requirements

  • Windows 11 25H2 with a working Bluetooth stack
  • Any A2DP-capable Bluetooth headset already paired
  • Admin rights to change device services
Step by step

Instructions

01

Identify the two endpoints

Open **Settings > System > Sound** and look at the output list. If you see both **Headphones (Stereo)** and **Headset** entries for the same device, Windows is using HFP (mono) whenever an app opens the microphone.

02

Open the classic Devices and Printers panel

Press Win+R and run the control command below. Modern **Settings** does not expose per-profile toggles yet.

control printers
03

Disable the Hands-Free Telephony service

Right-click your headset, choose **Properties > Services**, and uncheck **Hands-free Telephony**. Click **OK** and wait for Windows to reconfigure the device.

⚠ warningThe built-in mic will stop working on this headset until you re-enable the service.
04

Set the stereo endpoint as default

Back in **Settings > System > Sound**, select the remaining **Headphones (Stereo)** entry and set it as the default output. The mono **Headset** entry should be gone.

05

Stop apps from grabbing the microphone

Open **Settings > Privacy & security > Microphone** and turn off access for apps that do not need it (Teams, Discord, browsers). Any app that opens the mic forces Windows to re-create the HFP endpoint.

tipOn Discord, set **Input Device** to your webcam or a dummy mic instead of the headset.
06

Test stereo output

Play a stereo test track and confirm clean L/R separation. YouTube's channel test (https://www.youtube.com/watch?v=M6NFkbbdcZQ) is a quick check.

Troubleshooting

Common issues

The Services tab is empty

Unpair the headset in **Settings > Bluetooth & devices**, re-pair it, then reopen **Properties > Services**. Windows populates the list only after a full handshake.

It goes back to mono after a reboot

A background app still requests the mic. Open **Settings > Privacy & security > Microphone > Recent activity** to find and disable it.

No sound at all after disabling Hands-free

Reopen **Properties > Services** and re-tick **Audio Sink**; it may have been unchecked together.

FAQ

Frequently asked

Why does Windows switch to mono in the first place?

Classic Bluetooth cannot run A2DP (stereo) and HFP (mic) at the same time, so Windows drops to the mono HFP codec whenever an app opens the microphone.

Do LE Audio headphones have this problem?

No. LE Audio with LC3 supports stereo + mic together, but it needs headset, radio and Windows LE Audio support.

Is there a per-app fix instead?

Only partially. You can set the output per app in **Sound > Advanced**, but any app opening the mic still forces HFP globally.

How to undo this

Open **control printers**, right-click the headset, go to **Properties > Services** and re-tick **Hands-free Telephony**. The microphone and mono fallback behavior return.

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