bass

I've noticed that when I play music with some bass/beat, there is a buzzing I hear above my head in the roof. If I press up against the headliner, it seems to alleviate the buzzing sound. I enjoy classical and soft music too, but occasionally like to listen music with some bass. Anyone else have...

Alright, stupid question, but how do I adjust the bass? I’ve looked through the owners manual. I see the equalizer but not the bass. Specifically, the bass seems too high at most volumes, so I keep the volume lower than I’d like.