“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Good write-up.
Isn't tru2way supposed to solve this issue when compliant hardware for it finally comes out?
Yes, tru2way is designed to resolve some of these issues.
For more specifics on the minutiae, feel free to click the backlinks in the article. Those link to more in-depth pieces on each aspect.