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12-inch single
The 12-inch single (often simply called 12") is a type of gramophone record that has wider groove spacing and shorter playing time compared to typical LPs. This allows for louder levels to be cut on the disc by the cutting engineer, which in turn gives a wider dynamic range, and thus better sound quality. This record type is commonly used in disco and dance music genres, where DJs use them to play in discos or clubs. They are played at either 33⅓ or 45 rpm.
==Technical features==
12-inch singles typically have much shorter playing time than full-length LPs, thus require fewer grooves per inch. This extra space permits a broader dynamic range or louder recording level as the grooves' excursions (i.e., the width of the groove waves and distance traveled from side to side by the turntable stylus) can be much greater in amplitude, especially in the bass frequencies so important for dance music. Many record companies began producing 12-inch (30 cm) singles at 33⅓ rpm, although 45 rpm gives better treble response and was used on many 12-inch singles, especially in the UK.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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