I have a sony home theatre system DAV-DZ390K,its a 5.1,which i have connected to my pc and my pc has srs audio sandbox, somehow since the morning the bass from the sub woofer has increased to such an extent that the sound quality has deteriorated a lot.Can any of you guys suggest me something which i can try at home instead of going to the service station,i have tried checking all the cords as well as reducing the dynamic bass from the remote.My system is four months old.Thanking in advance.