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2. Equal-loudness contour - Wikipedia

   en.wikipedia.org/wiki/Equal-loudness_contour

   Equal-loudness contour. An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. [1] The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours.

3. Hearing range - Wikipedia

   en.wikipedia.org/wiki/Hearing_range

   Hearing range describes the frequency range 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 ...

4. Audiogram - Wikipedia

   en.wikipedia.org/wiki/Audiogram

   Audiogram. An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer. The Y axis represents intensity measured in decibels (dB) and the X axis represents frequency measured in hertz (Hz). [1] The threshold of hearing is plotted relative to a standardised curve that represents 'normal ...

5. Loudness - Wikipedia

   en.wikipedia.org/wiki/Loudness

   Loudness. In acoustics, loudness is the subjective perception of sound pressure. More formally, it is defined as the "attribute of auditory sensation in terms of which sounds can be ordered on a scale extending from quiet to loud". [1] The relation of physical attributes of sound to perceived loudness consists of physical, physiological and ...

6. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   A long-range acoustic device ( LRAD ), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control, which has caused permanent hearing damage, having an extremely high decibel capacity (up to 160 dB measured at one ...

7. Music Review: In a new expanded collection, how much of John ...

   www.aol.com/news/music-review-expanded...

   July 8, 2024 at 10:40 AM. The new remixed and expanded “Mind Games: The Ultimate Collection" is for those John Lennon fans who really, really love his inconsistent 1973 record of the same name ...