My Sub crackles loudly when watching parts of shows that have explosions/gunfight scenes. I have unplugged and reset it. Have reintroduced it to my sound bar. Still get this loud crackle or feedback when scene in show is an action scene.
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Sounds like ah the speakers in your Sub have blown.
My old Playbar did the same thing after I just moved it a little, and after a little Google I was able to read that one or more speakers had blown.
Can you see if one of the speakers has a crack along the edge or somewhere else. I've read that some people have repaired a speaker themselves with a little superglue :)
Of course, you shouldn't try to fix it if it's under warranty ;)
Even out of warranty, talk to Sonos before you open it up as you might be able to get some assistance that isn’t usually offered on opened systems.
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