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We surveyed the reviews on CNET, PCWorld, PC Magazine, Wired, Gear Diary, and Amazon to create this list of the top rated wireless portable headphones.
Infrasound is the realm of sounds in the frequency range of 20 Hz down to 0.001 Hz.
According to Harry F. Olson in his book Maths, Physics and Engineering:
20 Hz is considered the normal low frequency limit of human hearing.
The lower the frequency of sound, the more difficult it us for human to hear it. [...]
