The earpiece assembly houses the miniature loudspeaker, or receiver, that delivers processed sound to the ear canal. A fine wire connects it to the main electronics while flexible seals prevent moisture ingress. In this non-destructive cutaway, we see the acoustic chamber’s geometry. It’s perfectly tuned to balance volume, clarity, and comfort in a nearly invisible package.
https://android.googlesource.com/platform/system/core/+/master/init/README.md
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