What's the physics behind this phenomena (sound / electromagnetics)

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SUMMARY

The discussion centers on the phenomenon of humming in a sub-woofer when a laptop is plugged into the same outlet. This issue is attributed to electromagnetic interference (EMI), specifically conducted EMI, which occurs due to magnetic fields generated by nearby electronic devices. The interference can lead to audible noise in audio equipment, affecting sound quality. Understanding the sources and effects of EMI is crucial for resolving such audio issues.

PREREQUISITES
  • Basic understanding of electromagnetic interference (EMI)
  • Familiarity with audio equipment, specifically sub-woofers
  • Knowledge of electrical grounding and circuit design
  • Awareness of the principles of sound wave propagation
NEXT STEPS
  • Research methods to reduce electromagnetic interference in audio setups
  • Explore the impact of grounding techniques on audio quality
  • Learn about the effects of power supply configurations on audio equipment
  • Investigate the principles of sound wave propagation and its interaction with electronic devices
USEFUL FOR

Audio engineers, sound technicians, and anyone experiencing audio interference issues in home theater or music production setups.

nietzsche
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I have a stereo set-up with a sub-woofer. Sometimes, if my laptop is plugged in close by or in the same outlet, the sub-woofer "hums". It's not like a rumble, it's like a long, low, note.

An engineering major told me that it had something to do with magnetic fields being generated or something, but I wasn't entirely sober when he was explaining it to me. What could be causing it?
 
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Electromagnetic interference, most likely. Probably conducted EMI.
 

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