Mac Volume Resetting Itself on Tahoe? How to Stop It

You set your Mac's volume to a comfortable level, and a while later it's somewhere else: louder, quieter, or back at a level you never chose. If you noticed this after moving to macOS Tahoe, you're not alone in wondering whether it's a bug.

A volume that moves without you touching it feels like a fault, but it's usually some piece of software or hardware deciding the level for you. Before assuming the Mac is broken, it helps to find out which one.

Common reasons the volume changes on its own

• Output device switching. macOS keeps a separate volume for each output: built-in speakers, headphones, a monitor, a dock, AirPods. When you plug in or unplug something, the Mac switches output and uses that device's level. Back and forth, this looks like random resets.
• Bluetooth reconnects. AirPods and other Bluetooth headphones can come back at a different level when they reconnect, for example after sleep or after switching between your Mac and your phone.
• Calls and the microphone. When an app starts using your Bluetooth headphones' microphone, many headphones switch to a headset mode that sounds quieter. It feels like the volume dropped, even though the slider didn't move.
• Apps adjusting their own level. Browsers, video players and call apps often have their own volume settings, and some reset them when a new video or call starts.
• Accessibility and spoken announcements. Some accessibility features lower other audio while they speak. If they're on and you don't need them, they can make the volume seem to dip.

Fix the built-in causes first

Work through these in order.

1. Set each output deliberately. Connect each output you use and set its volume once in System Settings > Sound > Output. Since macOS keeps a level per device, this removes most surprises when you switch.
2. Check which output is active. If the volume looks wrong, open the Sound settings or the Sound icon in the menu bar and confirm the right device is selected.
3. Re-pair problem Bluetooth devices. Remove the headphones in System Settings > Bluetooth and pair them fresh. A stale pairing is a common cause of odd behaviour on connect.
4. Use a separate mic for calls. Keep Bluetooth headphones as the output, but pick the Mac's built-in microphone or a USB mic in your call app. The headphones then stay in their normal mode.
5. Review accessibility features. In System Settings > Accessibility, turn off spoken announcements or features you don't use.
6. Check app settings. In your browser, video player or call app, look for options that adjust volume automatically and turn them off.
7. Restart Core Audio. If audio seems stuck or erratic, open Terminal and run sudo killall coreaudiod. Audio restarts after a short interruption.
8. Update and restart. Install the latest macOS update available for your Mac and reboot once afterwards.

If the system volume stays put after this, one of the above was the cause. More causes are covered in Mac volume keeps changing by itself, and sleep-related cases in Mac volume resets after sleep.

When the real problem is one app

Sometimes the system volume is fine, but one app is always the odd one out: a browser tab blasting an ad, or a call that comes in much louder or quieter than your music. With a single system slider, the only fix is to keep riding the master volume, which feels like the volume changing all the time.

macOS has no built-in way to set a level per app. SoundDial adds one: a menu-bar mixer where each running app gets its own slider.

• Turn one app down without touching the others
• Boost a quiet app above 100%, up to 200%
• Mute a noisy app with one click while the rest keep playing

SoundDial remembers the level you set for each app (Settings > General > Default volume for new apps: Remember last). Mute is not remembered, and an app you open later may need a touch of its slider before the saved level applies. Its auto-ducking (on by default) lowers other apps while a call app uses the microphone and restores them afterwards, so if other apps dip during calls, that's the reason; you can turn it off. SoundDial does not fix the system-level causes above, so work through those first. More on how it works: per-app volume control on Mac.

SoundDial, a per-app volume mixer for Mac needs macOS 14.2 or later and costs €14.99 one-time purchase on the Mac App Store, no subscription.

Get SoundDial on the Mac App Store.