I have a cheap retractable aux cable
I picked up from walmart for $5 that I use
In my 2011 GMC Sierra. I just make sure the volume
Is up on the blackberry device in media player
And went to options and turned headset music eq
To rock and audio boost on and that really made
The music sound much better on the premium
Sound system I have in the truck.
Posted from my CrackBerry at wapforums.crackberry.com
I also use a cheap retractable aux cord in my car to my berry. The sound, although low, is of great quality. Turn up the berry and adjust the rest of the volume on the car. However, when you remove the cord, be careful! The tip of the cord actually broke off in my berry once! It took a week of trial and error before I was able to remove it. I was inches away from calling to get a refurb...
Thing about the cheap cords is that the wire inside the cord can break easier, it happens easier and is a pretty frequent problem. Other than that the quality shouldn't really matter.
I use a slightly higher grade aux cord and both my Torch and Playbook sound great on after market stereo in my Mustang. Wish everything on my PB functioned as well lol.
I usually put the blackberry on one level below max volume, and than adjust it from the car. Sometimes if the bb is too loud, the sound gets distroted, and it will not sound too good. By having it not at max, I can adjust both of the volumes to get a clearer sound.