I can hear sound from iphone and computer, but I do not hear any sound from Android phone. It is because some cheap smartphones and cheap Bluetooth headphones will compress the dynamic range of the sound, causing in cases with a higher frequency for you to hear nothing at all. Also, if some devices have an equalizing function, it will cause the sound to distort and also lead to ineffectiveness.
If it is no sound, its healing is not effect, however, even if the sound is not too loud, it still works for you. As conclusion, we recommend that you select a headphone which can play sound from Android phone, then set it to an audible level and not adjust the volume frequently.
Additional Information: What is the Hearing Threshold?
Healthy young adults should be able to hear frequencies anywhere between 20 and 20.000 Hz. The most important frequencies for speech and language are between 250 and 8000 Hz. What we call the hearing “threshold” is the lowest intensity where a person begins to hear a sound. Normally, this threshold for loudness is between 0 dB and 20 dB. But the hearing threshold of sound frequencies varies from one individual to another. This explains why you might hear a noise from a near construction site or the neighbors down the street, but your friend does not.
Hearing range describes the range of frequencies that can be heard by humans or other animals, though it can also refer to the range of levels. The human range is commonly given as 20 to 20,000 Hz, although there is considerable variation between individuals, especially at high frequencies, and a gradual loss of sensitivity to higher frequencies with age is considered normal. Sensitivity also varies with frequency, as shown by equal-loudness contours. Routine investigation for hearing loss usually involves an audiogram which shows threshold levels relative to a normal. Several animal species are able to hear frequencies well beyond the human hearing range. Some dolphins and bats, for example, can hear frequencies up to 100,000 Hz. Elephants can hear sounds at 14–16 Hz, while some whales can hear infrasonic sounds as low as 7 Hz.
Additional Information: Are Intensity and Frequency of Sound the Same? The answer to this question is clearly no. You might suspect, that the higher the frequency, the louder we perceive a noise, but frequency does not tell us how loud a sound is. Intensity or loudness is the amount of energy of a vibration and is measured in decibels (dB). If a sound is loud, it has a high intensity.
