Paradigm subwoofer noise when turn on and off?

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Pdr-10 v4, didn't use for a long time. Now when turn on, there is one pop sound; when turn off, after 5 seconds, fart sound can be heard for around 5 seconds.

Don't know what happened to it? I changed the power outlets, and tried different receivers, the same result.

Thanks.
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.