macOS relies on a complex background daemon called coreaudiod (Core Audio Daemon) to manage every single sound that enters or exits your Mac. Whether you are playing a YouTube video, recording a podcast through a USB microphone, or using Bluetooth headphones, the data is routed through this master process.
Occasionally, coreaudiod can crash, hang, or become confused when rapidly switching between multiple audio interfaces. When this happens, the symptoms are infuriating: your Mac might suddenly go entirely mute, the audio might stutter violently, or the volume controls in the menu bar might turn grey and refuse to respond.
While restarting your Mac will usually fix this, it interrupts your workflow. In this guide, you will learn how to use the macOS Terminal to forcefully kill and rebuild the audio core in seconds, restoring sound without a reboot.
Step 1: Open the macOS Terminal
Because you are interacting with a low-level system daemon, you must use the command line.
- Press Command + Space to open Spotlight Search.
- Type Terminal and press Return.
Step 2: Force Restart the Core Audio Daemon
To fix the issue, you simply need to kill the frozen coreaudiod process. The beauty of macOS is that it monitors critical daemons; the exact millisecond you kill it, the operating system will instantly spawn a fresh, uncorrupted version of it.
Because this daemon belongs to the system (not your specific user account), you must execute the kill command with root privileges (sudo).
- In the Terminal window, type the following command exactly:
sudo killall coreaudiod - Press Return.
- The Terminal will prompt you for a password. Type your Mac administrator password (the one you use to log in). Note: As you type, the cursor will not move, and no asterisks will appear. This is normal Unix security. Just type it and press Return.
Step 3: Verify the Fix
The moment you press Return, several things will happen simultaneously:
- Any music or video currently playing will immediately pause or stop.
- If you were using external speakers or headphones, you might hear a brief “pop” as the connection is severed and re-established.
- The volume icon in your menu bar (if it was greyed out) should turn black again.
Press the volume up/down keys on your keyboard. You should hear the familiar macOS “pop” feedback sound. Try playing a video again; the audio routing should be completely restored.
When to Use This Fix
This command is incredibly useful for musicians and video editors who frequently plug and unplug complex USB audio interfaces or MIDI controllers while their digital audio workstations (DAWs) are running. If Logic Pro or Premiere Pro suddenly refuses to recognize an interface that is clearly plugged in, running sudo killall coreaudiod will force the system to rescan all connected hardware, usually resolving the dropout instantly.