I am having some problems with bass in my car. I seem to lose bass with the doors closed and windows up. but when the passenger side door is open it seems to create more bass. I actaully measured this on my spl metre. theres about a 2-3db difference. If it is caused by bass being canceled out, would moving the sub to the other side of the car really help? I am only asking cause everthing is screwed down and carpeted so moving it would be some work.