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Humming Sunfire True Subwoofer Mk-II

Discussion in 'Speakers & Subwoofers' started by PhxWilsonsKen, Jun 4, 2015.

  1. PhxWilsonsKen

    PhxWilsonsKen Auditioning

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    The speaker is probably 15 years old. I have had it into the shop and have had all of the capacitors replaced. It worked well for a while after the capacitors were replaced, But now it is humming again. When it starts humming I can turn the volume all the way up and it will stop the home. I turn it back down to normal listening position things are fine, for a while. But the humm will start again. Any ideas or help will be appreciated.
     
  2. schan1269

    schan1269 HTF Expert
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    Sounds like ground loop.
     
  3. PhxWilsonsKen

    PhxWilsonsKen Auditioning

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    Thank you for the reply. If it is a ground loop, would it come and go? Would it stop when I turn the volume all the up and then back down? How do I fix a ground loop anyway?
     
  4. Phil A

    Phil A Producer

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  5. Phil A

    Phil A Producer

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    The first thing to do is pinpoint what is causing it by plugging things in one at a time. Often a cable box can cause it.
     
  6. Phil A

    Phil A Producer

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  7. Phil A

    Phil A Producer

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    I have a Sunfire, Jr. sub in the guest room (formerly had it in an old house in the master bedroom) and it is old but no issues.
     
  8. OhNoNotThatGuy

    OhNoNotThatGuy Auditioning

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    I had this issue as well as popping when changing sources or turning the reciever off. Mine is working great for the past 2 days since I changed the sub’s plug from a direct outlet to a quality home theater surge protector. Absolutely no issues the past 2 days
     

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