The short answer
Change one thing at a time: the cable, then the source device, then the input. Crackling that follows the speaker to another device means the speaker; crackling that stays with the device means the source. Most cases turn out to be a cable or a loose connection.
Crackling, popping and intermittent buzzing all sound alike and have different origins. The discipline that solves it is changing a single variable at a time rather than several at once.
The common causes
A loose or failing cable
By far the most common. Wiggle the cable at each end while audio plays — if the crackle responds, you have found it. Look particularly at the plug, where cables flex and break internally.
Ground loop hum
A steady buzz rather than a crackle, usually when devices are plugged into different sockets or when a television aerial is involved. It changes when you unplug the aerial or move everything onto one extension. Ground loop isolators exist specifically for this.
Interference
Phones cause a distinctive stuttering buzz in unshielded speakers just before a call or message arrives. Unshielded speaker cables running alongside mains cables pick up hum. Moving cables apart resolves both.
Driver damage
If the crackle is present on every source, at every volume, and gets worse with bass, the speaker cone or surround may be damaged. Look at the cone for splits, and press gently at the edges listening for a scraping sound. Foam surrounds perish with age on older speakers and that is a repairable fault.
Digital problems
On a computer, crackling that appears only with certain applications or at certain sample rates is a driver or buffer problem rather than hardware. Changing the sample rate in sound settings, or updating the audio driver, commonly fixes it.
Isolating it
Wiggle each cable while audio plays
At both ends, one at a time. A crackle that responds to movement is a cable or a connector, and that is the end of the investigation.
Swap the cable
Use a known-good one. Cables are the cheapest component and the likeliest culprit.
Change the source
Play from a phone instead of the computer, or a different input on the amplifier. If the crackle disappears, the original source is responsible.
Move the speakers to another device entirely
This is the decisive test. Crackling that follows the speakers means the speakers; crackling that stays behind means everything else.
Check the audio sample rate on a computer
Sound settings, the output device, Properties, Advanced, and try a different default format such as 24-bit 48000 Hz. Mismatched sample rates produce crackling that sounds exactly like a hardware fault.
Update or reinstall the audio driver
Get it from the motherboard or laptop manufacturer rather than a generic one. Then test again with everything else unchanged.
If the crackle appears only when loud, the amplifier may be clipping — being driven beyond its clean output. Sustained clipping genuinely damages drivers. Turn it down, and if you need more volume, the amplifier is undersized rather than the speakers being at fault.
Frequently asked questions
Why do my speakers buzz when my phone is nearby?
The phone’s radio induces current in unshielded cables and components. It is harmless and the fix is distance, or better shielded cables. It is also a useful sign that your cables are unshielded.
What is a ground loop and how do I fix it?
A steady hum caused by devices referencing slightly different electrical grounds. Plugging everything into the same socket often fixes it, and a ground loop isolator will if that is impractical.
Can crackling damage my speakers?
The crackle itself usually cannot, but clipping from an overdriven amplifier can. If it appears only at high volume, treat that as a warning rather than a quirk.
Why do my speakers crackle only on my computer?
Almost always a sample rate mismatch or a driver problem rather than hardware. Change the default format in sound settings and update the audio driver.
Wiggle the cables first. It takes ten seconds and it identifies the cause in a large share of cases.
