When you use supported Beats with iPhone, iPad, or Mac, you can change the accessibility settings for your Beats to suit your hearing needs. Amplify soft sounds and adjust certain frequencies to help music, movies, phone calls, and podcasts sound more crisp and clear.
On your iPhone or iPad, go to Settings 
> Accessibility > Audio & Visual > Headphone Accommodations, then turn on Headphone Accommodations.
Tap Custom Audio Setup, then follow the onscreen instructions. Or manually set any of the following:
Tune Audio For: Choose Balanced Tone, Vocal Range, or Brightness.
Level: Choose Slight, Moderate, or Strong amplification of soft sounds.
Phone: Apply these audio settings to phone calls.
Media: Apply these audio settings to media playback.
To preview your audio settings, tap Play Sample.
On your Mac, choose Apple menu 
in the sidebar.
Click Audio, choose your Beats, then turn on Headphone Accommodations.
Click Custom Audio Setup, then follow the onscreen instructions. Or manually set any of the following:
Tune audio for: Choose Balanced Tone, Vocal Range, or Brightness.
Optimization: Choose Slight, Moderate, or Strong amplification of soft sounds.
Phone: Apply these audio settings to phone calls.
Media: Apply these audio settings to media playback.
To preview your audio settings, click Play Sample.