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When I am in bed I have the sensation of hearing a beeping sound, I think it happens after using my Chinese trademark headphones. I have never used them with high volume, because of that I wonder if it could be due to ultrasounds produced by the device.

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    Most headphones are incapable of covering the full range of human hearing, much less produce sounds outside that range.
    – Mark
    Jul 17, 2016 at 6:41
  • @Mark high frequencies tend to be easy for headphones.
    – StrongBad
    Jul 27, 2016 at 18:32

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The frequency response of a headphone is one of the biggest selling points with a wider and flatter response being "better". Ultrasound is typically defined as sounds above 20 kHz. The high end Sennheiser HD 800 S headphones have a flat frequency response out to 51 kHz. Even more reasonably priced headphones can still produce ultra sound (e.g., the Sennheiser HD 25 can produce frequencies up to 22 kHz).

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  • Great answer, can you contribute any knowledge on research into effects of >20kHz audio on hearing?
    – John
    Jul 28, 2016 at 8:57

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