After listening to your high-volume car stereo for 15 minutes, you fail to realize how loudly the music is blasting. this best illustrates

Prolonged exposure to high volume car stereo may damage and affect hearing sensation and capability of a person. It was discussed in a science subject that a normal human conversation is approximately 60 decibels. If the stereo volume is more that 85 decibels and keeps playing for 15 minutes, this is considered harmful.