Go to Settings > Video and Audio > Audio Format > Auto. Scroll to Enhance Dialogue and Reduce Loud Sounds, then toggle on/off. From this menu, you can also turn Navigation Clicks off to silence UI ...
Waiting for others to kick the tires on Apple's newest iPhone system? In the meantime, make sure you've set up these features and options.
You might not know about all of these iOS settings, but they let you tweak your experience and get the most out of your iPhone.