Subwoofer sound degrading - electronics fix?

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Dear community,

I'm new to this forum and i hope i put my thread into the right section. A view years ago i bought a more or less cheap 5.1 home cinnema system (Universum DVD-DR 1030). After 4 years of working fine, the sound coming from the subwoofer suddenly startes degrading gradually. Below some volume threshold it stopped working, until it finally stopped working at all (meaning even if i tune the volume to maximum). Is anybody familiar with this kind of problem? Could there be some easy solution like replacing a capacitor or some power amplifiere IC's?

Thx for your help!
 
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