Mac でマイクが動かない?直し方

Microphone problems on Mac usually come down to one of four things: privacy permissions, wrong input device, browser-level permissions, or a corrupted Core Audio process. This guide walks through each fix from quickest to most involved.

Quick Fixes to Try First

• Is the right input selected? Click the speaker icon in the menu bar (or Sound in System Settings)
• Did you mute the mic via a hardware switch on your headset or USB mic?
• Try a different USB port or cable for external mics
• Restart the app that's having trouble (Zoom, Teams, browser)

Check macOS Microphone Privacy Settings

Open System Settings → Privacy & Security → Microphone. Every app that wants mic access appears here with a toggle. If your browser, Zoom, or any other app isn't enabled, flip the toggle on. After macOS major updates, these toggles often need re-granting.

If an app you need isn't listed at all, open the app and try to use the microphone: macOS will prompt for permission, and the app will then appear in Privacy settings.

Select the Correct Input Device in Sound Settings

System Settings → Sound → Input tab. Pick your microphone (Built-in, USB headset, AirPods, etc.). The "Input level" bar should bounce when you speak. If it doesn't move at all on the right device, the mic itself isn't producing signal.

Verify in seconds with our free browser test:

Fix Browser Microphone Permissions (Chrome, Safari, Firefox)

Each browser tracks per-site mic permissions independently of macOS. Click the padlock in the address bar → Site settings → Microphone → Allow. In Safari: Settings → Websites → Microphone → set the site to Allow. Reload after changing.

Reset Core Audio on Mac

When audio gets glitchy in unexplained ways, killing the Core Audio daemon often fixes it without rebooting. Open Terminal and run: sudo killall coreaudiod. Enter your password: Core Audio restarts in a second, and all audio devices reinitialize.

External Microphone Not Recognized on Mac

For USB and XLR microphones, check Audio MIDI Setup (Applications → Utilities). Your mic should appear with the correct sample rate (usually 44.1 kHz or 48 kHz). If the rate doesn't match your recording app, you'll get distortion or no audio.

Avoid USB hubs for high-bandwidth devices like 1080p webcam mics or pro audio interfaces. Plug directly into the Mac.

When to Book an Apple Genius Bar Appointment

If all software fixes fail and the mic also fails in our online tester, you likely have a hardware fault. MacBook microphones use a delicate cable that runs through the hinge: frequent open/close cycles can wear it. Apple replaces faulty mics under warranty (and out-of-warranty for a fixed fee).