MacBook Pro M4 Speakers Not Working — How to Fix

Section 1: Quick Checks

Before diving into deeper troubleshooting, rule out the obvious:

1. Check the volume: Press the F12 key or use the Touch Bar/function row volume controls to make sure the volume is up. Click the speaker icon in the menu bar and verify the slider is not at zero.
2. Check for mute: Press F10 to toggle mute. The menu bar speaker icon shows an "X" when muted. Also check System Settings > Sound > Output and confirm "MacBook Pro Speakers" is selected.
3. Disconnect external audio: Unplug any headphones, USB audio interfaces, HDMI cables, or Thunderbolt docks. The MacBook may be routing audio to an external device. Also check for active Bluetooth connections (AirPods, speakers).
4. Test with different audio: Try playing audio from multiple apps — a YouTube video in Safari, Music app, and a system sound (System Settings > Sound > Sound Effects > Alert Sound). If only one app has no sound, the issue is app-specific, not system-wide.
5. Check the headphone jack: Look inside the 3.5mm headphone port for debris or a broken headphone tip stuck inside. A stuck tip tricks the MacBook into thinking headphones are connected. Use a flashlight to inspect and a can of compressed air to clear debris.

Section 2: Reset Core Audio

macOS uses a background process called coreaudiod to manage all audio output. This process can crash or get stuck, causing complete audio loss. Restarting it often fixes the problem instantly:

1. Open Terminal: Press Cmd+Space, type "Terminal," and press Enter.
2. Kill the audio process: Type the following command and press Enter:
   sudo killall coreaudiod
   Enter your admin password when prompted. The process will restart automatically within a few seconds.
3. Test audio: Try playing a sound. In most cases, this fixes "no sound" issues immediately.

If you are uncomfortable with Terminal, you can achieve the same result by opening Activity Monitor (search in Spotlight), finding "coreaudiod" in the list, selecting it, and clicking the X (Stop) button.

Section 3: Reset NVRAM and SMC

The MacBook Pro M4 uses Apple Silicon, which changes how system resets work compared to older Intel Macs:

NVRAM Reset (Apple Silicon method)

NVRAM stores sound volume, display resolution, time zone, and boot disk settings. On Apple Silicon Macs, NVRAM is automatically reset during a specific shutdown procedure:

1. Shut down the MacBook completely (Apple menu > Shut Down).
2. Wait 30 seconds.
3. Press and hold the power button until you see "Loading startup options."
4. Release the power button, then select your startup disk and click "Continue."
5. The NVRAM is reset during this process.

SMC-equivalent Reset

Apple Silicon Macs do not have a traditional SMC, but a full shutdown reset accomplishes the same thing:

1. Go to Apple menu > Shut Down.
2. After the MacBook is fully off, wait at least 30 seconds.
3. Press the power button to turn it back on.

This simple shutdown-wait-restart cycle resets the power management, audio routing, and hardware controller systems that can cause speaker issues.

Section 4: Fix Crackling, Distortion, or Low Volume

If the speakers work but sound bad, try these targeted fixes:

• Crackling during playback:
  1. Open Audio MIDI Setup (search in Spotlight).
  2. Select "MacBook Pro Speakers" in the left panel.
  3. Change the Format to "44100 Hz" and "2ch-24bit" (or try other sample rates). Mismatched sample rates cause crackling.
• Low maximum volume:
  1. Check System Settings > Sound > Output and make sure the "Output volume" slider is at maximum and "Balance" is centered.
  2. Disable any third-party audio software (equalizers like Boom, SoundSource, or eqMac) that may be limiting output.
  3. Check if a volume limiter is set: System Settings > Sound > Output — look for any volume limit option.
• Distortion at high volume: The M4 MacBook Pro speakers are powerful but have limits. If you hear distortion only at maximum volume, reduce volume to 80-90%. Also check for dust buildup in the speaker grilles on either side of the keyboard — clean with compressed air.
• Spatial Audio issues: If Spatial Audio sounds wrong or unbalanced, go to System Settings > Sound and toggle Spatial Audio off and back on. Also check Apple Music > Settings > Playback > Spatial Audio.

Section 5: macOS Reinstall and Safe Mode

If no software fix has worked, a deeper system issue may be at play:

1. Boot into Safe Mode:
   • Shut down the MacBook
   • Press and hold the power button until "Loading startup options" appears
   • Select your startup disk, then hold Shift and click "Continue in Safe Mode"
   • Safe Mode disables third-party extensions and clears caches. Test the speakers in Safe Mode — if they work, a third-party app or extension is the culprit
2. Check for problematic kernel extensions: In Terminal, type systemextensionsctl list to see installed system extensions. Audio plugins, VPN software, and virtualization tools (Parallels, VMware) can interfere with audio drivers.
3. Create a new user account: Go to System Settings > Users & Groups > Add User. Log into the new account and test speakers. If they work in the new account, the issue is in your user profile — corrupted preference files are the likely cause.
4. Reinstall macOS: As a last resort, boot into Recovery (Power button > Options > Recovery) and select "Reinstall macOS." This reinstalls the operating system without erasing your data, but back up first with Time Machine to be safe.

Section 6: Hardware Failure — When to Get Professional Help

If none of the above fixes work, the speaker hardware itself may be damaged:

• Liquid damage: Even a small spill can corrode speaker connections or short out amplifier circuits on the logic board. Check for stains or residue around the keyboard and speaker grilles.
• Blown speaker driver: A sudden loud pop followed by no sound from one side often indicates a blown speaker. This requires physical replacement of the speaker module.
• Logic board issue: If the audio controller on the M4 chip or its supporting circuits are damaged, no software fix will help. Apple Diagnostics can help confirm: restart while holding D to run built-in hardware diagnostics.
• Apple repair costs: Speaker replacement on the MacBook Pro M4 typically costs $149-199 through Apple. AppleCare+ may cover it depending on the cause.

For professional MacBook speaker diagnosis and repair, contact PC Medics of NJ at 856-914-1074. Free diagnosis with a 90-day warranty on all repairs.