Why when I connect my Iphone to my car the music is so quiet?

I have a aux cable already connected to the stereo that I got the car, my friend plugged her iphone in the same one i have 4s and it worked fine it was not quiet at all, i plugged my iphone in and i have to have it on full volume just to make out the words on the song i was playing music of o2 tunes which is an app but when my friend did hers it worked fine does anyone know why or can i do something on the settings?

If the volume is up all the way, then it could be that the cable doesn't work with your phone right. I have a cable and it doesn't work on my phone, but does on my ipad, also try moving the cable around a little

Sometimes the phone just can't put out enough sound through certain cords.

Make sure both sounds are up in the iPhone and on the stereo so it probably like that because the volume on your phone isn't up

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