Question: how to adjust sound equalizer on iphone 6?
Answer: Tap the Home button on the front of your iPhone.
Tap the Settings icon on the Home screen.
Tap iPod in the list of settings.
Tap EQ in the list of iPod settings.
Tap different EQ presets (Pop, Rock, R&B, Dance, and so on) and listen carefully to the way they change how the song sounds.