Jabra Biz 2400 II CC Audio Quality Issue on Mac

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Nik: When getting a call on my Jabra Biz 2400 II CC, the sound quality temporarily decreases for music. This often happens with Bluetooth headsets on my phone, but it's never happened on my computer. What happens on my phone is: when a phone call ends, the sound quality always returns to full quality after the phone call ends. However, this has failed to happen with my Jabra Biz 2400 II CC on my Mac. It's like music is mildly muffled now.

ChatGPT: You're describing a situation where your Jabra Biz 2400 II CC (a wired USB headset) has reduced audio quality after a call on your Mac, and the sound doesn’t recover like it would on a phone or with a Bluetooth headset.

What's Happening

When a voice call or app (like Zoom, Teams, or FaceTime) takes control of your headset’s mic and speakers, macOS switches the audio mode into "telephone mode" (narrowband, mono, optimized for speech). This is expected—but:

  • On Bluetooth headsets, this is often SCO mode.
  • On USB headsets like your Jabra, the system may switch to a lower sample rate (e.g., 16 kHz or 8 kHz).
  • Normally, macOS restores full stereo/high-quality playback after the app releases the device.
  • Sometimes, macOS doesn't reset the audio output sample rate, leaving the headset in a muffled state.

How to Fix It

1. Unplug and Replug the Jabra

Forces macOS to reinitialize the device.

2. Switch Output Devices Temporarily

Go to System Settings > Sound → switch to another output device, then back to the Jabra.

3. Use Audio MIDI Setup

Open Audio MIDI Setup via Spotlight → Select your Jabra device → Check the sample rate (e.g., 16 kHz). Change it to 44.1 kHz or 48 kHz if needed.

4. Restart CoreAudio

Run this command in Terminal:

<syntaxhighlight lang="bash"> sudo killall coreaudiod </syntaxhighlight>

Optional: Prevent it in the Future

  • Manually quit Zoom, FaceTime, or Teams after a call.
  • Consider using separate mic and speaker devices.
  • Install Jabra Direct software for firmware updates and audio settings.

Let me know if you'd like a shell script or shortcut to reset the sample rate or CoreAudio automatically.

Nik: Thank you, this has fixed it.

ChatGPT: Awesome — glad that did the trick! 🎧 If it ever happens again and you want a quicker way to fix it without opening Audio MIDI Setup, I can help you automate that reset with a little script or shortcut. Just let me know! Enjoy your crisp audio again!

Nik: Yes. Pls.

ChatGPT: Nice — here's a simple way to reset your Mac's audio system *without rebooting or opening Audio MIDI Setup manually*.

Option 1: Quick Terminal Command

<syntaxhighlight lang="bash"> sudo killall coreaudiod </syntaxhighlight>

This resets the audio system. You’ll be prompted for your Mac password.

Option 2: Shell Script

1. Create the script: <syntaxhighlight lang="bash"> nano ~/reset-audio.sh </syntaxhighlight>

2. Paste this inside: <syntaxhighlight lang="bash">

  1. !/bin/bash

echo "Resetting macOS audio system..." sudo killall coreaudiod echo "Done. Audio should now be back to full quality." </syntaxhighlight>

3. Save and exit nano. 4. Make it executable: <syntaxhighlight lang="bash"> chmod +x ~/reset-audio.sh </syntaxhighlight>

Run it anytime like this: <syntaxhighlight lang="bash"> ~/reset-audio.sh </syntaxhighlight>

Bonus: Turn It Into a One-Click App

1. Open Script Editor.app 2. Paste: <syntaxhighlight lang="applescript"> do shell script "killall coreaudiod" with administrator privileges </syntaxhighlight>

3. Save as an Application

Now you can double-click to reset audio anytime.

Let me know if you'd like a version that also resets sample rate or skips the password prompt.

Nik: I think Mac uses .command, not .sh and I don't know how to use nano.

<syntaxhighlight lang="bash"> Last login: Fri Mar 21 14:36:36 on ttys018 Restored session: Fri Mar 21 14:34:34 PDT 2025 edmiidz@m1 2025-03-21 % vim ~/reset-audio.command edmiidz@m1 2025-03-21 % chmod +x ~/reset-audio.command edmiidz@m1 2025-03-21 % ~/reset-audio.command Resetting macOS audio system... Password: Done. Audio should now be back to full quality. edmiidz@m1 2025-03-21 % </syntaxhighlight>

ChatGPT: Perfect! 🙌 You're ahead of the game — `.command` is indeed the better choice for clickable scripts on macOS, especially if you want to launch them from Finder or the Dock.

You’ve nailed it:

  • ✅ Created `reset-audio.command` with `vim`
  • ✅ Made it executable with `chmod +x`
  • ✅ Ran it successfully

To Use from Finder

1. Move to a convenient location: <syntaxhighlight lang="bash"> mv ~/reset-audio.command ~/Applications/ </syntaxhighlight>

2. Optionally rename it in Finder (e.g., “Fix Audio.command”).

3. Double-click from Finder to run.

Pro Tip: Skip the Password (Optional)

You can modify `sudoers` to allow this one command to run without a password — not generally recommended, but possible if you want to explore it.

Let me know if you'd like:

  • Dock icon
  • Keyboard shortcut
  • Sample rate fix
  • Password-less version

Nicely done.

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