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Dolby Atmos home theaters can be built upon conventional 5.1 and 7.1 layouts. For Dolby Atmos, the nomenclature differs slightly by an additional number at the end, that represents the number of overhead or Dolby Atmos enabled speakers: a 7.1.4 Dolby Atmos system is a conventional 7.1 layout with four overhead or Dolby Atmos enabled speakers.
7.1.2 and 7.1.4 immersive sound along with 5.1.2 and 5.1.4 format adds either 2 or 4 overhead speakers to enable sound objects and special effect sounds to be panned overhead for the listener. Introduced for theatrical film releases in 2012 by Dolby Laboratories under the trademark name Dolby Atmos .
The overhead in this scheme limited the playing time to slightly longer than a single even at 33 + 1 ⁄ 3 RPM on a 12-inch disc. Another failed experiment in the late 1920s and early '30s involved recording the left channel on one side of the disc and recording the right channel on the other side of the disc.
Malco Theatres, Inc. confirmed to the Commercial Appeal, on July 24, 1986, the sale of the company's 38 locations to Commonwealth Amusements Corp. of Kansas City, Missouri, was scheduled to be completed by the end of that summer. The deal fell through when Commonwealth decided not to expand at that time.