Right Speaker Dead on Mac After Tahoe? How to Fix It

If your right speaker went silent after updating to macOS Tahoe, check the left/right slider in your Sound settings first. Then restart Core Audio, try safe mode and rule out hardware. Most cases turn out to be software or settings.

1. Check the left/right slider

A slider pushed to one side is one of the most common reasons a channel goes quiet, and it's the quickest thing to check:

1. Open System Settings > Sound.
2. In the Output section, select your speakers (built-in, or your external device).
3. Find the slider between left and right and drag it to the center. If it was pulled to the left, the right channel will sound dead or very quiet.

Do this for each output device. The setting is kept separately for built-in speakers, headphones and each external speaker or USB audio device, so a centered slider on the built-in speakers won't help if the problem is on another device.

2. Find out whether it's a hardware channel

Play a stereo track you know well, then plug in wired headphones.

• If both channels work in headphones but one is dead through the speakers, the problem is likely the speaker itself or its path.
• If the same side is also dead in headphones, it's more likely software.

You can also play something in Music and move the left/right slider all the way to one side, then the other. If the sound moves cleanly between the two sides, both speakers work and the problem is in settings.

3. Restart Core Audio

All sound on the Mac goes through the Core Audio service (coreaudiod). After a major update it can get into a bad state: outputs disappear, a channel drops out, or the volume behaves oddly. Restarting it is safe:

1. Open Terminal (in Applications > Utilities).
2. Run sudo killall coreaudiod
3. Enter your password. The service restarts by itself within a moment.

Nothing is deleted. Test the right speaker again straight away.

4. Restart, then try safe mode

A full restart clears glitches that restarting Core Audio doesn't. If the channel is still dead, start up in safe mode, which loads a minimal system and skips third-party extensions and login items:

• Apple silicon: shut down. Press and hold the power button until startup options appear. Select your disk, then hold Shift and click Continue in Safe Mode.
• Intel: restart and hold Shift until the login window appears.

If both speakers work in safe mode, something installed before the update (an audio driver, a virtual audio device or an audio utility) is likely conflicting with Tahoe. Start up normally and update or remove recently installed audio software. Screen recorders, meeting apps and virtual audio devices are worth checking first.

5. Reset NVRAM (Intel Macs only)

On Intel Macs, some sound settings are stored in NVRAM, and a stale value can survive an update. Shut down, then turn the Mac on and immediately hold Option + Command + P + R for about 20 seconds. Apple silicon Macs don't need this, so skip it on an M-series Mac.

6. Install any pending update

Early releases of a major macOS version sometimes ship with audio bugs that later updates fix. Open System Settings > General > Software Update and install anything available for Tahoe.

When it's really hardware

If safe mode, a Core Audio restart and updates all fail, and the same side is dead in headphones too, it may be a hardware fault. An update can be pure coincidence: speakers and audio components do fail. Run Apple Diagnostics (on Apple silicon, shut down and hold the power button until startup options appear, then press Command-D; on Intel, hold D at startup). If it reports a problem, contact Apple Support or an authorized service provider. Don't buy software for a broken speaker.

Rule of thumb: if the sound moves to both sides when you move the left/right slider, both speakers are physically fine and the fix is in software. If it never reaches the dead side, suspect hardware.

Where a volume app fits (and where it doesn't)

A dead channel is not something a volume app can fix, and SoundDial doesn't change the left/right setting; the steps above are your path. If you also ran into this because one app was blasting while another was too quiet, that's a different problem: SoundDial, a per-app volume mixer for Mac, gives each running app its own slider, mute and boost up to 200%. See per-app volume control on Mac. It needs macOS 14.2 or later and costs €14.99 one-time purchase on the Mac App Store.

For other post-update sound problems, see Mac sound not working after an update.

The short version

1. Center the left/right slider in Sound > Output, for each output device.
2. Test with headphones to separate hardware from software.
3. Run sudo killall coreaudiod, then restart.
4. Try safe mode to catch conflicts with other audio software.
5. Reset NVRAM on Intel; install any Tahoe update.
6. Still dead in headphones too? Run Apple Diagnostics and contact Apple.