My friend has an original, unrooted S4.
I am waiting for the exact model number, but I believe it's the i9500.
She mentioned that when she plays music from her phone to her car stereo, the volume is often (but not always) low, and yes, phone volume is cranked up all the way.
When this happens, she has to raise the car stereo volume considerably in order to be able to listen.
So far, she's tried two different cables. Also, she's currently driving a dealer issued loaner and observed the same issue.
I've read the S4 FAQ and performed a Search. I couldn't find anything.
Have you guys ever heard of a similar issue with the S4?
Thank you in advance.