Technician helping fix an Acer computer that needs frequent restart

Steve H.

Reviewed for technical accuracy

Specialities: Mac speaker crackling or popping sound, distorted audio, volume-related buzzing, Bluetooth audio confusion, Safe Mode checks, Audio MIDI Setup.

Mac computer speaker crackling sound — common reasons and what to check first (Bluetooth, updates, sample rate, Safe Mode)

Technician avatar Technician
Hi — we’ll go slowly and keep it safe. A Mac speaker crackling sound (popping, static, buzzing, or distorted audio) can feel alarming, but many causes are simple and don’t require “deep” changes.

Trust moment: I don’t want you installing random “audio cleaners” or changing advanced settings blindly. We’ll start with the least risky checks first.

A few quick questions (answer what you can):
• Which Mac is it (MacBook, iMac, Mac mini) and what macOS version, if you know?
• Does the crackling happen on built-in speakers, on headphones, or both?
• Did it begin after a macOS update or after connecting a new device (Bluetooth speaker, AirPods, external monitor)?
• Is it constant, or only at certain volume levels or in certain apps (YouTube, Zoom, Apple TV, music)?
Customer
It’s my MacBook and the speakers started crackling today. I’m not very technical. It scares me because it sounds like it’s breaking.
Technician avatar Technician
I understand — and you’re doing the right thing by stopping and checking before trying anything risky.

First, let’s narrow it down safely: when you plug in wired headphones (if you have them), does the crackling also happen in the headphones, or only in the MacBook speakers? If you don’t have wired headphones, that’s okay — tell me if you use Bluetooth audio like AirPods.
Customer
I tried my AirPods and it sounded normal. The crackling is only from the MacBook speakers.
Technician avatar Technician
That’s a helpful clue: if AirPods are clean but the built-in speakers crackle, it can be speaker-related — but it can also be a setting, a software glitch, or even dust around the speaker grills.

Safe check #1: does the crackling happen in every app (for example, YouTube in a browser and also a system sound like the volume “click”), or only in one app like Zoom or Apple TV?
Customer
I notice it on YouTube and also when I play a video my grandson sent me. The volume is not even that high.
Technician avatar Technician
Got it. Next, let’s rule out a very common “surprise” cause: audio being routed in an unexpected way.

Safe check #2 (no changes yet): in System Settings → Sound → Output, does it show MacBook Speakers as the output device, or does it show something else (like AirPods, a TV, a monitor, or “USB audio”)?
Customer
It says MacBook Speakers. I didn’t change anything. Could this start from an update?
Technician avatar Technician
Yes — it can. It’s a fairly typical situation after a macOS update or after a device reconnects (Bluetooth, a monitor, or an audio accessory). Sometimes a background sound service or an audio format mismatch shows up as popping or crackling.

Trust moment: I’m not going to have you “reset everything” right away. First we’ll do a couple of low-risk checks that won’t put your files at risk.

When did you first notice it — immediately after a restart/update, or in the middle of normal use? And does it get worse when you raise the volume above, say, half?
Customer
I think it started after I restarted this morning. It gets worse when I turn it up, but it also happens at normal volume.
Technician avatar Technician
Thank you — that pattern (worse at higher volume, still present at normal volume) can point to either (1) the speakers being stressed by certain frequencies, or (2) a software/format issue that affects playback.

Safe check #3: do you have anything connected to the MacBook right now — an external monitor, a USB hub/dock, a charger, or any USB audio device? Sometimes a hub or monitor changes audio behavior even when “MacBook Speakers” is selected.
Customer
Yes, it’s connected to a monitor and a little USB hub. I also use Zoom sometimes.
Technician avatar Technician
That’s very useful. Here’s a calm, safe way to test without “breaking” anything:

• If you’re comfortable, try playing audio once with the USB hub disconnected (just unplug the hub cable).
• If the monitor is connected by a dock/hub, that’s especially worth testing.

We’re not changing settings — just checking whether an accessory is involved. If the crackling changes when the hub is removed, we learn a lot quickly.

Also: do you hear the crackling on system sounds (like changing the volume) or only during videos/music?
Customer
Mostly during videos. System sounds are softer but I think I still hear a little pop.
Technician avatar Technician
Understood. Next “safe check” is to see if the issue is caused by something that loads during normal startup (like an audio add-on, meeting app helper, or a driver). The safest test for that on Mac is Safe Mode — it loads only essential items.

Trust moment: I don’t want you to do anything that could make you feel stuck. Safe Mode is reversible (you restart normally to exit).

Before we even consider that, tell me: is your MacBook newer with an Apple chip (M1/M2/M3) or older Intel? If you’re not sure, “About This Mac” shows it.
Customer
It says Apple M2. I’m worried it’s hardware. Do speakers fail like this?
Technician avatar Technician
They can, but we don’t assume the worst right away. A hardware speaker issue often shows up as crackling that’s strongest at certain volumes or with bass-heavy sounds, and it won’t follow a specific app.

A software/setting issue often starts suddenly after a restart/update, or changes when you disconnect accessories, switch output devices, or test in Safe Mode.

Another gentle check (no “tuning,” just observation): does the crackling happen with all sound (music, voices, notifications), or mostly with deeper sounds like music and movie audio?
Customer
Mostly with music and movies. Voices are a bit better. Is there something I should check in settings?
Technician avatar Technician
Yes — but we’ll keep it simple and safe. There’s a built-in Mac tool called Audio MIDI Setup that shows the audio format (like sample rate). If it’s set oddly, it can sometimes contribute to popping or crackling.

Important: I’m not telling you to change numbers at random. First we check what it’s currently set to, and we only change anything if there’s a clear mismatch (for example, when an external device or a hub is involved).

Final question for now: do you ever use an external microphone or USB headset for Zoom, or is it just the MacBook microphone/speakers?
Customer
Sometimes I use a USB headset for Zoom, but not today. I just want to make sure I don’t make it worse.
Technician avatar Technician
That’s exactly the right mindset. The safest path is: we first isolate whether it’s caused by an accessory (hub/monitor/USB headset), then we check basic sound output, then we consider Safe Mode as a non-destructive test.

If you open the chat, tell me: (1) whether unplugging the USB hub changes the crackling, (2) whether the problem is only on built-in speakers, and (3) your macOS version if you can see it. From there I’ll guide you through the least risky next check — and we’ll avoid anything that could put your files or settings at risk.

Quick answer: what to check first when your Mac speakers crackle or pop

Accepted first checks for Mac computer speaker crackling sound:
• Confirm where it happens: built-in speakers vs headphones/AirPods (this helps separate speaker vs software).
• Check Sound → Output and make sure MacBook Speakers is selected (not a monitor, Bluetooth device, or USB audio).
• Disconnect non-essential accessories (especially a USB hub/dock or external monitor connection) and retest briefly.
• If it started after a restart/update, consider a Safe Mode test as a low-risk way to see if something loading in the background is involved.

Why MacBook or iMac speakers start crackling (common reasons)

Crackling, popping, or distorted sound on a Mac often comes from one of a few common places: audio being routed to (or influenced by) a connected device, a background audio service glitch after a restart, or an audio format mismatch when accessories are involved. It can also be more noticeable with music or movies because deeper sounds can stress speakers more than normal voices. If the noise happens only on built-in speakers but not on headphones, that’s an important clue. The safest goal is to isolate the cause before changing anything major.

What to do next: safe checks before you assume it’s a blown speaker

Start with checks that don’t risk your data or settings: confirm the output device, then temporarily disconnect docks/hubs and retest with simple audio. If you use Zoom, USB headsets, or external microphones, unplug them and see if anything changes. If the crackling began after a macOS update or a restart, Safe Mode is a gentle diagnostic step because it loads only essential items. Avoid installing unknown “fix tools” or changing advanced audio settings without a clear reason. If the sound becomes worse rapidly, or the Mac shows any physical signs (heat/smell), stop and seek help.

Mac speaker crackling — calm, senior-friendly guidance

Start safe: check output, disconnect accessories, and test without guessing.

If your Mac speakers are crackling, don’t panic and don’t try a long list of random “fixes.” First, confirm whether the noise is only on built-in speakers or also on headphones/AirPods. Next, make sure Sound Output is set correctly and briefly test with accessories disconnected (USB hub/dock, monitor, USB headset). If it started after a restart or update, a Safe Mode test can help identify whether something running in the background is involved. If you share what you’re hearing and what’s connected, an expert can help you choose the least risky next step.

Disclaimer: This information is AI-generated and intended for general guidance only. Avoid unknown “audio fix” utilities and do not change advanced settings unless you understand them. If you hear loud physical rattling, smell burning, or the Mac becomes unusually hot, stop and consult a qualified technician.

What to check next

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We help you tell if it’s a settings issue, an accessory conflict (hub/monitor/USB headset), an update-related audio glitch, or a speaker problem — without risky steps.

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No guesswork. Many crackling speaker reports improve after safe checks: confirm output, disconnect accessories, and test in Safe Mode to isolate the cause.

FAQ

Why did my Mac speaker crackling sound start suddenly?

This can happen after a restart, after connecting a monitor or USB hub, or when macOS changes audio routing. It can also show up when a background audio service glitches. If headphones/AirPods sound clean but built-in speakers crackle, that’s a key clue. Start with safe checks: confirm Sound Output and disconnect accessories briefly.

Mac speaker crackling after update — is this common?

It can happen after a macOS update, especially if audio drivers or background services restart differently. Sometimes the issue is only noticeable in certain apps at first. A Safe Mode test is a low-risk way to see if something that loads normally is involved. If it improves in Safe Mode, it usually points to software or an add-on rather than immediate hardware failure.

Is crackling sound on Mac speakers hardware or settings?

It can be either. If crackling happens only at higher volume or with bass-heavy sound, the speakers may be stressed. If it changes when you disconnect a hub/monitor, switch output devices, or test in Safe Mode, settings or software are more likely. The goal is to isolate the cause before making big changes.

Can this be fixed without service?

Often, yes — many cases are related to output selection, accessories, or a temporary macOS audio glitch. Safe checks can narrow it down quickly without risking your files. If the sound is crackling even at low volume across all apps, or you hear physical rattling, service may be safer. If you’re unsure, document when it happens and what is connected.

Sources

Filed under: Audio / Camera / Input Devices

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