Increase bass

Hey Newtoearbuds,

While their would not be an option specific to increasing bass levels for audio, we'd recommend reviewing this link for your options on customizing headphone audio with iPhone: Customize headphone audio levels on your iPhone or iPad - Apple Support

"Manually adjust audio settings

From the Headphone Audio screen, you can also adjust tone and amplification settings manually. Tap Play Sample to hear an audio sample with your current settings. You can change these settings while listening to the sample to compare them.

To adjust the audio volume balance between left and right channels:

1. Go to Settings > Accessibility > Audio/Visual.
2. Adjust the Balance slider.

If you're using Transparency mode on your AirPods Pro or AirPods Max, learn how to adjust the audio-volume balance between left and right channels."

Thanks!