An important part of why LBBS outperforms is the bell-like shape.
It allows to place the earbud playing directly into the ear canal, instead of facing the concha.
Imagine placing speakers facing a wall instead of facing you - that's why earbuds with the classic shape underperform.
Cost may not be a large factor in earbuds' performance, but quality components certainly are.
I think that's an extreme statement. Our ears naturally capture sound from multiple directions including reflected sound from the concha. Sound doesn't have to be directly piped into our ears. Regardless, while I appreciate fit is unique to the user, there are many shells that I manage to get adequate fit with where I can direct the sound to the ear canal, not just LBBS.
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