Crowd noise is unrefined we hear

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Possible Answers: ROAR.

Last seen on: The Sun – Two Speed Crossword – Nov 2 2018

Random information on the term “ROAR”:

A roar is a type of animal vocalization consisting of both a low fundamental frequency (pitch) and low formant frequency.[1][2] Many mammals have the ability to produce roars and other roar-like vocalizations. These include big cats, gorillas, elephants, some bovids, howler monkeys, bears, red deer, some pinnipeds and hammer-headed bats.

The ability to roar has an anatomical basis, often involving modifications to the larynx and hyoid bone and enlarged internal air spaces for low-frequency acoustic resonance. While roaring, animals may stretch out their necks and elevate their heads to increase the space for resonance. Though usually airborne, some roars are emitted underwater, as in the case of the male harbor seal.[2]

Roaring mammals have evolved various means to achieve their vocalizations. A proportionally large larynx contributes to a deeper fundamental frequency. The male hammer-headed bat has a larynx that takes up most of his thoracic cavity and is half the size of his backbone. A larger larynx also has enlarged vocal cords which also contributes to a deeper pitch; as the folds increase in mass, their oscillation rate decreases.[2] In addition, the big cats (lion, tiger, leopard and jaguar, referred to as the “roaring cats”), have vocal cords that are square-shaped as opposed the triangle-shaped cords of other felids; this allows them to produce a louder call with less lung pressure.[1] The elasticity of the larynx and the length of the vocal tract affect the formant of a sound. In big cats and male red deer and fallow deer, specialized musculature pulls the larynx deeper in the vocal tract when roaring, lowering the vocal tract resonance.[2]

ROAR on Wikipedia