I just thought of something.

IEM’s have so much bass impact, especially deep bass impact.

I wondered what a 10mm IEM dynamic driver equivalent would be in headphones to achieve the same sound? 100mm??

IEM’s create a better isolation seal and are way in there in your ear canal so maybe comparing them to over 100mm headphone drivers is more accurate.

edit: 10mm dynamic driver size was just chosen from a popular IEM the Blon. It’s also used in my KZ ZS10 Pro I assume it’s a pretty common size.