The way you wear the earbuds and the tightness of the ear tips you wear can affect the Bass effect.

If you think the bass is poor,please make sure to wear earbuds securely and correctly the first,then change to a larger size and more tighten ear tips or change to foam ear tips.
If you think the bass is too much,you can change to a smaller size.
You can change the EQ by the triple press on either earbud.