Yeah, I don't really know. I found that if I had the volume turned up too much on the iPod that the bass would come through has though the speakers could not handle it even though it was on turn up on the car stero, not really sure what is going on there. The other thing I have noticed is that high frequencies tend to get the best sound, don't know why. When I turn the sound down to just over half and turn my radio volume up I get great sound and bass. Again, the best way will always be to wire it into your car stero, but if you don't, this is the way to go. I have had great luck with the product and am very happy with it. I am sure a lot of some of the problems are the kinds of cars and steros in them which may be troublesome for some.