Car audio system is very important because when you are driving alone then only the music is your friend which is beside you.
and don’t let you sleep or divert your mind because music is a thing which is very important in life you never get bored when you are listening to music.
Any music player which sport USB has high quality of sound because USB is a device which provide all the property to the sound system.
on use of aux cable sound quality get decrease somehow.
For Greater Bass quality the speaker must be settled in the backside of the car.
do not use the heavy sound because in that sound sound quality is not good but if you are using the sound quality speaker like Sony speakers JBL, Maximum of girls have Sony, pioneer speakers and they have good quality
if you want high sound then high Bass Then go for JBL because they have the sound quality as according to your satisfaction. however there are little expensive but JBL satisfied you most. but don’t go for local JBL buy original JBL speakers only. and can the reputed companies bigger than the sound quality .