Dodgy speakers??

Was wondering if anyone has come across this. I noticed that when I use Bluetooth to my iPhone the front speakers vibrate / crackle, more noticeable when accelerating. Blown speakers maybe? Or just shitty speakers? Or a combo of both?

Any ideas would be welcome

 

The combo.

When doing a search on the subject, you will find that the head unit produces a dirty signal that is difficult to process or overcome the lack of dynamic range. And that yes, the speakers are crap. For starters, you can eliminate rattles and make the speakers sound somewhat better by sound deadening the doors. The 4 doors on the DC will take almost 70 ft^2 of material.