Short answer
4 steps- Turn the volume down by a third. If the crackle stops, the speaker was being overdriven.
- Try a different song or app. If only one source crackles, the file or stream is the problem.
- Play a slow sweep and note the pitch where the crackle starts.
- On a phone that got wet recently, play a water eject tone first.
Run a quick sweep test
A pure tone that rises slowly is the best way to hear a speaker problem, because music masks it. Start at moderate volume and listen for a buzz, rattle or crackle as the pitch climbs.
Use the full speaker test to play each side separately, or the bass test to check the low end, where damaged cones usually fail first.
What the result means
- Crackle only at high volume: distortion. The speaker is being pushed past what it can play cleanly. Lower the volume, and turn off any bass boost or volume booster.
- Crackle at one pitch, every time: something is touching or rattling at that frequency. On phones it’s usually water or debris on the mesh; on larger speakers it can be a loose grille or a torn cone.
- Random pops, even at low volume: a connection problem or software. Check cables, Bluetooth and drivers, below.
- Crackle on one side only: the problem is in that speaker or its wiring, not the audio source.
Phone speaker crackling
The most common cause is water. Droplets behind the grille vibrate along with the cone and make a fizzing or crackling sound, especially after a shower or rain. Play the water eject tone two or three times with the speaker facing down. Then clear any dust or lint as described in the cleaning guide.
If crackling started after a drop, the speaker may be damaged or a connector may have shifted. That’s a repair job.
Laptop and computer speakers crackling
On Windows, crackling is often software rather than hardware:
- Open Settings > System > Sound, select your speakers and turn off Audio enhancements.
- In the same panel, change the output Format to a different sample rate, such as 48,000 Hz, and test again.
- Update or reinstall the audio driver in Device Manager under Sound, video and game controllers.
- Plug in the charger. Some laptops crackle on battery-saving power plans.
On a Mac, check that the volume isn’t maxed with a boosting app, then restart Core Audio from Terminal with sudo killall coreaudiod. More fixes are in the laptop speaker guide.
For wired desktop speakers, wiggle the cable at both ends while audio plays. If the crackle changes, replace the cable or clean the jack. A crackle when you turn the volume knob means the knob itself is dirty or worn.
Bluetooth speakers and headphones
Bluetooth crackle usually comes from distance or interference. Move closer, keep your phone out of a back pocket, and step away from Wi-Fi routers and microwaves. If it persists, unpair and pair the device again.
When to replace the speaker
If crackling happens on every source, at low volume, at the same pitch, and survives a dry-out and a clean, the cone or voice coil is damaged. You can’t fix that with software or sound. A phone or laptop speaker module is a common, relatively cheap repair.