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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1Most headphones are incapable of covering the full range of human hearing, much less produce sounds outside that range. – Mark Jul 17 '16 at 06:41
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@Mark high frequencies tend to be easy for headphones. – StrongBad Jul 27 '16 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).
StrongBad
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Great answer, can you contribute any knowledge on research into effects of >20kHz audio on hearing? – John Jul 28 '16 at 08:57