A:Answer Hi there! The low sound that you're hearing is the headphone's noise canceling function working. Over time, you'll be able to get used to it rendering the sound unnoticeable. You may check this link to learn how noise canceling works: https://us.en.kb.sony.com/app/answers/detail/a_id/40681/p/40940,40941,96670/c/65,66/kw/sound%20while%20noise%20canceling%20is%20on Thanks, -Mark