Quick fix: Open More sound settings → Playback tab. Set the “Stereo” entry of your headphones as default. Disable the “Hands-Free AG Audio” entry (right-click → Disable). Windows can only switch to HFP if the Hands-Free entry is enabled.

You want Bluetooth headphones to always use the high-quality A2DP/Stereo profile. The problem: when any app activates the microphone (Discord opens, Teams launches), Windows switches the headphones to Hands-Free Profile (HFP) for bidirectional audio — but HFP is mono and 16 kHz, sounding like an old phone call. Disabling the HFP entry forces Windows to stay on A2DP/Stereo permanently.

Symptom: Want Bluetooth headphones to use high-quality stereo always, even during calls.
Affects: Windows 11 (and Windows 10) with Bluetooth headphones supporting both A2DP and HFP.
Fix time: ~5 minutes.

What causes this

Bluetooth audio has two main profiles. A2DP (Advanced Audio Distribution Profile): high-quality stereo, output only — no microphone. HFP (Hands-Free Profile): low-quality mono with microphone. Windows switches profiles automatically based on app needs. The trade-off: when HFP engages (during calls), music quality drops dramatically. If you accept losing the headset mic, you can force A2DP-only.

Method 1: Disable Hands-Free AG entry permanently

The standard fix.

Right-click the speaker icon in the system tray → Sound settings.
Click More sound settings.
On the Playback tab, you should see two entries for your Bluetooth headphones:
- Stereo entry (e.g., “Headphones (Stereo)”)
- Hands-Free AG Audio entry (e.g., “Headset (Hands-Free AG Audio)”)
Right-click the Hands-Free AG entry → Disable.
Right-click the Stereo entry → Set as Default Device.
Right-click the Stereo entry again → Set as Default Communication Device.
Now Windows can’t switch to HFP. Music stays at A2DP quality always.
For calls, you’ll use a separate mic — see Method 2 for setup.

This is the core fix. Trade-off: no mic via Bluetooth headphones.

Method 2: Set a separate microphone for calls

Since you’ve disabled HFP, calls need a different mic.

In More sound settings → Recording tab:
Pick an alternative input:
- Laptop built-in mic: usually labeled something like “Microphone Array (Realtek…)” or “Internal Microphone.”
- USB microphone: if you have one plugged in.
- External USB headset mic: a USB headset is the cleanest setup for serious call work.
Right-click your chosen mic → Set as Default Device.
Right-click again → Set as Default Communication Device.
In call apps (Teams, Zoom, Discord), confirm the right mic is selected in app settings.
Test: join a call. Audio output through Bluetooth headphones (A2DP stereo); mic input via separate device.

This gives you the best of both — high-quality music + working calls.

Method 3: Use LE Audio if supported (for headphones with both A2DP and LE Audio)

LE Audio supports bidirectional stereo without HFP’s quality penalty.

Check if your hardware supports LE Audio (see related article on enabling LE Audio).
If supported: Settings → Bluetooth & devices → (headphones) → Audio quality → Use LE Audio when available. Tick on.
LE Audio provides stereo audio with mic input — without the mono HFP fallback.
This is the right long-term solution if your hardware supports it.

For LE Audio-capable hardware, this is the cleanest fix.

How to verify the fix worked

Play music. Quality is high (A2DP).
Open Teams/Zoom and start a call. Audio quality from headphones stays high — doesn’t drop to phone-quality.
Mic input works through your separate device.
In More sound settings → Playback tab, Hands-Free AG entry shows greyed out (disabled).

If none of these work

If headphones still drop to HFP quality during calls, three causes apply. App-side override: some apps force HFP via direct request. Check app audio settings for “output device” — pick the Stereo entry. Driver limitation: older Bluetooth drivers may not allow disabling the HFP entry. Update Bluetooth driver from Intel.com or your laptop OEM. Headphone-side behavior: rare but some Bluetooth headphones can’t maintain A2DP while a mic is requested — they switch entirely. In that case, use a separate USB mic (Method 2).

Bottom line: Disable the Hands-Free AG Audio entry to keep Bluetooth headphones in A2DP/Stereo always. Use a separate mic for calls. Or upgrade to LE Audio-capable hardware for the cleanest solution.