Are you interested in testing your hearing online to determine whether you should contact an audiologist for further testing? Try this link, which tests for the frequencies 500 Hz to 8000 Hz. Human speech usually ranges from 500 Hz to 4000 Hz.
http://www1.freehearingtest.ca/Default.aspx?TargetPage=HEARINGTESTINTRO
Another link, http://www.jimmyr.com/blog/hearingloss.html will test for higher frequencies, from 8000 Hz to 22,000 Hz. After age 19, hearing for most people progressively decreases from 18,000-20,000 Hz. Adults over age 30 generally can hear sounds only in the 8000-15000 Hz range. Teenagers in school use a "Mosquito" ring tone for their cell phones in the 17,000 Hz range because most adults wouldn’t hear it if they were more than 1 meter away. People up to about age 24 typically are able to hear sounds up to about 22000 Hz.
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