You might be able to isolate specifically which speaker is damaged by listening closely, especially if you have a subwoofer or an elaborate surround sound setup. If the speakers are the problem, it’s likely that they’re damaged. The fix here is simple enough: just use a different cable, preferably one with a high-quality jack and better shielding. What you’re hearing is electromagnetic interference from your PC or other electrical devices in the room. Usually this means that either the connector on the end has some kind of physical defect causing a poor connection with the audio source, or the cable itself is poorly shielded. If you hear clearer sound with no interference, then the cable was the likely culprit. If the problems continue (and it’s possible to use another cable with your speakers or headphones), then try replacing the cable.
If you still hear the unwanted noises, your PC is likely to blame. You can perform the same test in reverse, too: get another set of speakers or headphones and plug them into your PC. Note that it’s perfectly normal to hear pops and buzzes as you disconnect the audio jack and plug it into something else, but if you continue to hear electronic interference even after plugging it in, you can rule out your PC as the problem. To see if the speakers are the problem, simply plug them into an audio source other than your PC-like a phone or an MP3 player. It’s easy enough to nail down which part of your speaker setup is at fault. Broadly speaking, we can break them down into three categories: problems that originate from the physical speakers, the cable connection, and from the PC itself. Luckily, the most common issues are fairly obvious. There are dozens, maybe hundreds of explanations for unwanted sounds coming from your speakers.
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