Circumaural means something that covers the outer/external part of the ear (known as the pinna; plural pinnae).
Circumaural headphones are designed so that their cups (the parts containing the speakers) completely enclose the ears.
Although intraural devices (fitted into the ear) can be positioned more accurately, circumaural headphones have other advantages such as:
Excellent sound quality
Very comfortable to wear
Good external noise rejection
Easier to incorporate additional features
Being large and cumbersome, circumaural headphones are not usually the preferred option for casual music listeners. They are more commonly used by audio enthusiasts and professionals.
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