Meizu X6 - Manual (Page 31)

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1. EQ
There are following sound field effects available,
Normal, Rock, Jazz, Classic, Pop, Bass, User, TruBass, SRS, WOW.
With the '+' and '-' buttons to select the EQ, press the 'Menu' button to confirm.
User EQ
You can use the User EQ to adjust it.
Select 'USER EQ' and press the 'Menu' button.
Change the values with the '+' and '-' button.
With and buttons to select it and press the 'Menu' button.
Detailed Features by Menu
Sound Effect