in ear monitors - they sit inside your ear and create a seal?

• e.g. airpod pros
• moondrop

earbuds - they sit outside the ear?

• e.g. airpods

some difference btwn IEMs and earbuds

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audio quality

• https://www.reddit.com/r/AppleMusic/comments/q452h0/can_someone_explain_to_me_the_differences_between/
• https://www.adobe.com/creativecloud/video/discover/audio-bitrate.html
• https://www.reddit.com/r/explainlikeimfive/comments/mqrf9e/eli5what_is_the_difference_between_high_quality/

equalizer

• https://www.reddit.com/r/explainlikeimfive/comments/10rqzoz/eli5_what_does_the_equalizer_do/
• https://www.reddit.com/r/headphones/comments/13uejk2/how_do_you_guys_eq_anything/
• https://www.cnet.com/tech/mobile/what-is-eq-how-to-improve-the-sound-of-your-headphones/