You're listening to music and hear a pop. Then a crackle. Then a stutter where the audio cuts out for a fraction of a second and comes back. It's not the song — it's your Mac. Audio crackling on macOS is maddeningly common, and it has at least six different causes.
This guide covers every known cause of audio crackling, popping, and stuttering on Mac, from software fixes to the one hardware issue you should know about.
1. Restart Core Audio (the quick fix)
The single most effective fix for sudden audio crackling is restarting macOS's audio daemon. Open Terminal and run:
sudo killall coreaudiod
Audio will cut out for one second and restart. In many cases, the crackling stops immediately. This works because coreaudiod — the process that manages all audio on macOS — can get into a corrupted state after sleep/wake cycles, Bluetooth device connections, or app crashes.
If this fixes it, the crackling was caused by a temporary daemon issue. If it comes back regularly, read on for permanent fixes.
2. CPU overload
Audio crackling often correlates with high CPU usage. When your Mac's CPU is maxed out, it can't process audio buffers fast enough, causing gaps that sound like pops and crackles.
Check: Open Activity Monitor (Applications → Utilities) and look at the CPU tab. If you see consistently high CPU usage (80%+), that's likely the cause.
Fix: Close unnecessary apps, especially resource-heavy ones like browsers with many tabs, video editors, or VMs. If a specific process is using excessive CPU, consider whether it's behaving normally or needs to be restarted.
3. Bluetooth audio issues
Bluetooth is the most common source of crackling for wireless headphone and speaker users. Several things can cause it:
- Interference: WiFi, USB 3.0 devices, and other Bluetooth devices can interfere with your audio connection. Try moving closer to your Mac or removing sources of interference.
- Codec switching: When an app activates your microphone, macOS switches from AAC to SCO codec. This transition can cause a brief crackle or pop.
- Bluetooth congestion: If you have many Bluetooth devices connected simultaneously, the radio can struggle. Disconnect devices you're not using.
Fix: Reset Bluetooth by holding Shift+Option, clicking the Bluetooth icon in the menu bar, and selecting "Reset the Bluetooth module" (if available). Alternatively, remove the device from Bluetooth settings and re-pair it.
4. Sample rate mismatch
If your audio output device is running at a different sample rate than the audio being played, macOS has to resample in real-time. This resampling can introduce artifacts — especially at lower buffer sizes.
Check: Open Audio MIDI Setup (Applications → Utilities), select your output device, and check the sample rate. Common rates are 44.1 kHz (CD quality) and 48 kHz (video/streaming standard).
Fix: Set the sample rate to match your most common use case. For music: 44.1 kHz. For video/streaming: 48 kHz. If you use a USB audio interface, consult its documentation for the optimal sample rate and buffer size.
5. USB audio device buffer issues
External USB audio devices (DACs, audio interfaces, USB headphones) can crackle if the buffer size is too small for your system's current load.
Fix: In Audio MIDI Setup, select your USB device and try increasing the buffer size (if the option is available). In audio applications like Logic, Ableton, or GarageBand, increase the I/O buffer size in audio preferences. A larger buffer means slightly more latency but fewer audio glitches.
6. macOS update regression
Some macOS updates introduce audio bugs. This has happened with nearly every major macOS release — Catalina, Big Sur, Monterey, Ventura, Sonoma, Sequoia, and Tahoe have all had audio crackling reported after initial release.
Fix: Check if Apple has released a point update (e.g., 15.0.1, 15.1) that addresses audio issues. You can also check the Apple Developer Forums and Reddit for whether other users are experiencing the same issue. If it's a known macOS bug, a fix usually arrives within one or two point releases.
7. Kernel extensions or audio plugins
Third-party audio drivers, virtual audio devices, or audio plugins can conflict with macOS's native audio stack. This is especially common with older audio software that uses kernel extensions (kexts) deprecated in recent macOS versions.
Fix: Check if you have any third-party audio software installed: Soundflower, BlackHole, Loopback, or older audio interface drivers. Try disabling or uninstalling them temporarily to see if the crackling stops. If it does, check for updated versions compatible with your macOS version.
Managing audio quality with SoundDial
While SoundDial doesn't directly fix hardware or system-level crackling, it can help you manage audio in ways that reduce the problem:
- Reduce competing audio sources: Use SoundDial to mute apps you're not actively using. Fewer simultaneous audio streams means less CPU pressure on audio processing.
- Volume boost instead of system max: If you're running system volume at 100% and still pushing apps louder, the audio path is working at its limits. Use SoundDial's per-app boost to amplify specific apps to 200% while keeping the system volume at a more comfortable 70-80%. This can reduce distortion at the system output level.
- Quick output device switching: If crackling is related to a specific output device, SoundDial lets you switch devices from its menu bar panel without digging through System Settings.
Get SoundDial on the Mac App Store — €14.99 one-time purchase, no subscription, macOS 14.2+.