A worked example for the MacBook Air (13-inch, M4, 2025)
- For a MacBook Air (13-inch, M4, 2025), begin with Apple's preparation and Sound output checks for distorted audio.
- If those checks don't resolve it, run the MRI and Audio diagnostic suites. The direct route requires non-beta macOS Tahoe 26.0 or later.
- Use the results to guide a service conversation if the problem remains.
When music is still playing but sounds rough on the left or right, we'd begin with preparation and output settings because restarting reloads processes and the output checks establish which speakers are selected. That gives you a useful starting point before moving into hardware diagnostics.
The worked example below is for the Apple MacBook Air (13-inch, M4, 2025). Apple's US distorted-sound troubleshooting (opens in a new tab) covers 2024-and-later Mac laptops with Apple silicon, including problems affecting either speaker. For an older Mac or another model family, follow Apple's instructions for your particular computer.
Prepare power and software first
Connect your laptop to a working power outlet with a functioning Apple power adapter and charging cable. Use an adapter with the appropriate wattage for your computer, and let the battery charge for at least 15 minutes before continuing with the preparation.
Next, restart the Mac. Restarting clears memory and reloads processes, which can help isolate software issues. This is part of Apple's preparation for these laptops (opens in a new tab), before you work through the checks for a particular symptom.
Once the Mac starts successfully, check for and install macOS software and firmware updates so its software is current before further troubleshooting. Keep the power adapter plugged in if you're relying on automatic update downloads: a MacBook Air needs that connection to download updates automatically.
Check the outside and disconnect external audio
Inspect the computer for signs of liquid damage. Liquid contact can short internal circuits and make the computer malfunction, so this physical check belongs before you continue with the sound controls.
Unplug headphones and external speakers, then check that no cable or other object remains inserted in the headphone jack. You're preparing to check the laptop's internal output, with external audio equipment disconnected.
Look into the headphone jack for visible debris as part of Apple's external checks (opens in a new tab). Keep this to a visual inspection. The things to establish here are whether the jack is unobstructed and whether you can see debris inside it.
Make the internal speakers the selected output
Open System Settings > Sound and choose the Output tab. Look for Internal Speakers in the available outputs and make sure it's selected. Availability and selection are separate checks: finding the entry is only the first part of setting the laptop's speakers as the output.
Check the output controls in that same tab. Volume must be above zero, mute must be off, and balance must be centered. Those are the settings in Apple's speaker checks (opens in a new tab), including when the reported distortion affects the left or right speaker.
If the sound issue remains after preparation and these checks, move on to the recommended diagnostic suites. The purpose of that next stage is to help isolate the cause of the unresolved problem.
Check whether you can run diagnostics directly
For this example, you'll use Apple Diagnostics for Repair, which runs directly on the Mac you're checking. You can select and run its suites on that computer without a second device acting as a diagnostic console.
Check the direct-diagnostics requirements (opens in a new tab) before shutting down. The Mac must have Apple silicon, have power, and be able to start in macOS. It must also run macOS Tahoe 26.0 or later. Intel-based Macs and beta versions of macOS aren't supported by this direct route.
You'll need a working Wi-Fi or wired internet connection on the Mac being tested. If you can install the latest available macOS updates, complete that preparation before proceeding into diagnostics.
Set up the laptop for the tests
Shut down the Mac, then unplug external devices except a keyboard, mouse, and display, if you're using them. This is the preparation for the diagnostic session, after the earlier checks in macOS.
Put the laptop on a hard, flat, stable surface with good ventilation. Connect its power adapter and charging cable for the tests. These placement and power requirements apply while you're running Apple's direct diagnostic procedure (opens in a new tab).
Choose your internet connection before turning the Mac back on. If you're using wired Ethernet, connect the Ethernet cable now. If you're using Wi-Fi, you'll choose the network after the computer enters diagnostics mode.
Enter the diagnostic menu
Use the startup screens as your cues for the next action. The diagnostic entry sequence (opens in a new tab) begins with the Mac shut down and takes you to a menu of available suites.
- Press and hold the power button, or the Touch ID button on a laptop that has it. Release it when you see “Loading startup options...” on the screen.
- When startup options appear, press and hold Command-D on the Mac's keyboard. The “Diagnostics & Repair” message confirms that you've entered diagnostics mode.
- Click Continue, select your Wi-Fi network if you're using Wi-Fi, and agree to the terms and conditions. Continue to the “Diagnose or Repair” screen.
- Select Run Diagnostics. You'll see the menu listing the available diagnostic suites.
If a Repair menu item appears, it means a previous repair still needs configuration. Select Repair to complete that configuration using Repair Assistant. If you encounter trouble navigating the diagnostic screens, restart the Mac and try again.
Run MRI, then the Audio suite
Run Mac Resource Inspector, shown as MRI, followed by Audio. These are the two suites recommended in Apple's distorted-speaker procedure (opens in a new tab). MRI checks for hardware components and performs short tests of hardware functionality.
On a Mac laptop, the Audio suite plays chordal tones through the internal speakers and listens for those tones through the built-in microphones. That's how it checks speaker and microphone functionality, so the quiet environment matters to the test.
Follow the instructions on the Mac's screen as you select and run the tests. If you perform the suite's headphone-jack check, you'll need headphones for that part. Apple's Audio test guidance (opens in a new tab) distinguishes that requirement from the internal-speaker test.
Use the results to decide on service
Examine the diagnostic results when the tests finish. Each suite contains multiple tests, and the results help isolate issues and investigate whether a part needs replacement. Use what the tests report when deciding how to proceed with the unresolved sound problem.
If your MacBook Air still needs attention after these checks, contact Apple about service through the service options linked from its US sound troubleshooting page (opens in a new tab). Apple warns that replacing a part may not resolve the issue.
For that conversation, describe whether the distortion affects the left speaker, right speaker, internal speakers, or external audio. Tell Apple which output checks you completed and what the MRI and Audio results reported.
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