Originally Posted by e92ben
It's also the quality of your aux cords. Get a little nicer ones and you'll notice the difference
it would have to be an extremely shitty cord. even radioshack junk would suffice for a 1 meter run.
but anyway, iphone/ipod line outs generally aren't exactly known for their amazing fidelity. not sure about the iphone 5.
you're better off using USB streaming (assuming you have a newer idrive) and letting the car do the D/A conversion