I have a Samsung-SM-J727VPP phone. I have loaded most of my cds to an extra card on the phone, only about a third of the capacity has been used. This sounds fine on all songs via any headphones. However when I connect it via blu tooth to my 2010 Mazda 3, the sound quality can vary quite a bit. Back before I had the phone I would connect my Ipod directly to the car with a cord and the sound was always perfect. Since getting the phone this direct connection no longer works. So I am more or less stuck using the blu tooth. The advantage of this is that I can skip from song to song with a switch on my steering wheel (I like random play). But is there some setting either on the phone or the car to improve the sound overall? The sound system is one that came installed when the car was new and is pretty basic. Any suggestions would be welcome. Thanks.