Frequency Sound. Twenty Hz is believed to be a human auditory normal low frequency limit. When the pure sine wave under ideal conditions, at very high volume replication, one of the audience will be able to identify 12 Hz low tone. The following 10 Hz, it can be perceived sound single cycle, accompanied by the eardrum pressure sensation. Auditory dynamic range of the system with the frequency drops. This compression, can be seen in the loudness level contour, which means, in levels increased slightly, can vary from almost inaudible to the perceived loudness. In the natural spread within the threshold by combining population, it may have a very low frequency sound, which for some people it is silent make impact on others. Has been known for acoustic wave induced in the human sense of awe and fear. Because it was not consciously perceived, it can make people vaguely feel, a supernatural event happening. Now you can hear what Hertz? To test yourself.
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