When listening to the stock radio and you turn the volume up a little bit, whenever there is bass in the music, there is something in the car vibrating making it sound like sh*t. It seems to be coming from the middle area somewhere around where the computer plug / handbrake area is. I tried to find exactly where it is coming from but couldn't.

Has anyone had this before or know where the vibrating sound is emitting from?

 

Just an update, I removed the rear ash tray / ECU plug cover and I think that removed some of the noise but it's still there. I think it's now coming from the left hand front door speaker.

 

Worked out that it has nothing to do with the rear ash tray. It's the left hand front speaker.