Lack of Bass While Using Headphones
This is likely due to the ear tip making a poor seal in your ear canal.
When no music is playing, your voice should sound louder and ambient noise should sound quieter; very similar to wearing a pair of ear plugs.
If you are not experiencing this, you may need to try using a larger sized ear tip. For assistance in finding the right sized tip, including 3rd party options, please see our articles - Where Can I Get Replacement Ear Tips for my Headphones? and How Do I Know Which Eartip Size is Right for Me?