I moved my computer and Dell 5650 surround speakers from a basement office to a bedroom, and now the speakers produce a constant low hum or ringing whenever they're powered on. It sometimes changes in volume and is less noticeable when music or a game is playing, but it's very distracting during quiet moments. Turning the speakers off stops it completely. I've tried using different wall outlets, but that hasn't helped. Could this be a grounding or electrical-interference problem, and is there anything else I should test before replacing the speakers?
4 Answers
This sounds like a ground loop or another grounding issue. Unplug the audio cables from the computer one at a time and see whether the noise changes. Also try powering the computer and speakers from separate outlets or, if possible, a different circuit. A ground-loop isolator for the analog audio connection may solve it.
Electrical or electromagnetic interference is another possibility. Keep the analog speaker cables away from power cords, USB cables, chargers, and monitor cables, and avoid bundling or crossing them together. Run the audio cables separately as a test. If the noise changes when you move the cables, interference is likely involved.
Before buying new speakers, try the speakers with another device, such as a phone or laptop running on battery power. If the hum disappears, the speakers are probably fine and the issue is related to the computer’s grounding or audio connection. If it remains, the speaker system itself may be failing.
Two outlets in different rooms may still be on the same electrical circuit, so moving plugs around might not change anything. The bedroom outlet could also be ungrounded or wired differently from the basement outlet. It’s worth checking whether the wall receptacle is properly grounded.
I tried a separate outlet and the hum stayed the same. I’ll test the audio cables individually next.