I wonder how they determine that? Especially with Bluetooth, you have no idea ho... | Hacker News

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		FireBeyond 10 months ago \| parent \| context \| favorite \| on: Ask HN: Life-changing purchases since 2020? (Under... I wonder how they determine that? Especially with Bluetooth, you have no idea how much sound energy is being put out, and can't infer it from power draw or anything similar.

camgunz 10 months ago [–]

It's as simple as you'd expect: AirPods and beats have their SPLs hardcoded, everything else is estimated based on volume control.

Although Apple says there can be bad interactions between this and live listen, so maybe there is some realtime monitoring happening.

https://support.apple.com/guide/iphone/check-your-headphone-...

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