A small (single) driver can do many things so much better than larger drivers. Less mass means faster response times, less resonance (ringing and/or stored energy), and because the sound is being delivered very close to the ears, SPL levels don't need to be nearly as high, resulting in less distortion. It's much easier for head/earphones to be cleaner, more linear, more detailed, in a word, more 'accurate.' In addition to this, you've eliminated the room's acoustics which may contribute a higher proportion of total sound heard than you might expect, possibly more than half.
What you gain in detail and intimacy, you loose in soundstage and imaging. I've not heard binaural recordings. They may be the answer to the "inside your head" effect. However, you'd need 'bodyphones' to get the visceral delivery to *feel* the bass.
What you gain in detail and intimacy, you loose in soundstage and imaging. I've not heard binaural recordings. They may be the answer to the "inside your head" effect. However, you'd need 'bodyphones' to get the visceral delivery to *feel* the bass.