Here you can check how well you can hear very low and high tones on your playback device. This can't replace an audiometric test by a doctor, because here it can't be tested how good the device is and how loud it is set. But you can get a feeling, what each tone sounds like and how good you can perceive different frequencies. Every tone has the same volume, very low and very high tones are heard less good.
Pure tones are played, the duration of each tone is two seconds. For testing, turn the volume as a start to rather low and play the test tones with 500, 1000 and 2000 hertz. At those frequencies, the human ear hears best, so the other tones should sound less loud. If one of these tones sounds unpleasant, turn the volume down, because higher tones sound much more unpleasant.
Please do not use headphones when using this test! Set the volume too low rather than too loud at first, and then turn it up if necessary!
Good full-range speakers can play tones from 20 to 20000 hertz, which is about the perceptibility of the human sense of hearing. Headphones and small loudspeakers can have problems with low tones. Check the high and very high tones from bottom to top. If those suddenly sound lower and louder, this points to technical problems.
The hearing threshold decreases with age. Children can sometimes hear sounds up to 30,000 Hertz. The author of this text, male, 51 years old at the time of writing, can just hear the sound at 13,000 hertz, which is a normal value for his age. In old age, the value then usually falls below 10,000.