Humming Capacitor: Causes and Solutions

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SUMMARY

The humming noise in active speakers is primarily caused by bad capacitors in the amplifier, often resulting in a 60 Hz hum. This issue is frequently associated with aging capacitors that vibrate and produce audible noise. To confirm the diagnosis, users should test their speakers on a different system and vice versa, using known working speakers to isolate the problem.

PREREQUISITES
  • Understanding of capacitor function in audio equipment
  • Basic knowledge of audio signal flow
  • Familiarity with troubleshooting audio systems
  • Experience with speaker and amplifier testing
NEXT STEPS
  • Research methods for testing capacitors in audio amplifiers
  • Learn about replacing capacitors in audio equipment
  • Explore the impact of power supply noise on audio performance
  • Investigate the effects of aging components in audio systems
USEFUL FOR

Audio engineers, electronics technicians, and anyone involved in maintaining or troubleshooting active speaker systems will benefit from this discussion.

Tree Penguin
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Hi, what can cause a capacitor to hum?
My active speakers are producing a lot of hiss (tweeter) / low humming (bass speaker) and the cause seems to be a capacitor as it vibrates a little and makes some noise doing it. Is it because of ageing?
Thanks.
 
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what you are hearing is 60 hz hum probably due to bad capacitors in your amp.
proof: put your speakers on another system and see if it goes away. double check by putting proven speakers on your system.
 

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