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10.2 surround sound
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== Channel configurations == 10.2 surround sound would add four more channels to the front listening area and only one [[surround channel]]. This is because human spatial perception of sound is much more precise in the front than in the back. In addition it adds depth to the sound field with two of the front channels being height channels, located above the listening area at 45 degrees relative to the listener.<ref name="tonmeister1">{{cite web|url=http://www.tonmeister.ca/main/textbook/intro_to_sound_recordingch11.html#x42-78400010.2.4 |title=10 Audio Recording |publisher=Tonmeister.ca |date=2011-10-23 |access-date=2012-11-09}}</ref> Lack of vertical information has long been considered one of the largest obstacles to realistic sound reproduction.<ref>{{cite web|url=http://www.stereophile.com/news/10489/ |title=Holman Conducts First Public Demo of "10.2" Surround Sound |publisher=Stereophile.com |date=1999-07-11 |access-date=2012-11-09}}</ref> Existing systems such as [[Dolby Pro Logic IIz]] simulate this with ''matrixed'' height channels, which are derived from ambient sounds from the left and right channels. The ".2" in 10.2 refers to the fact that an additional [[Low Frequency Effects]] channel is added, not just a second subwoofer, to enhance the sense of envelopment. All bass from the left channels are directed to a left LFE channel while right channel bass is directed to the right LFE channel. ===10.2=== The 12 channels of 10.2: *Seven front channels: Left Wide, Left Height, Left, [[center channel|Center]], Right, Right Height, Right Wide *Three surround channels: Left Surround, Back Surround, Right Surround *Two LFE channels: LFE Left and LFE Right 10.2 may also augment the LS (left surround) and RS (right surround) channels by two point surround channels that can better manipulate sound—allowing the mixer to shift sounds in a distinct 360° circle around the movie watcher. This would actually make it 12.2 ===12.2=== The only addition with 12.2 from 10.2 are the "point surround" or "diffuse surround" channels. These would be placed at the same angles as the standard surround speakers at +/-120 degrees, but would be diffuse radiators using [[dipole speakers]]. They would emit sound to reflect off the walls before arriving at the listening area.<ref name="tonmeister1"/> The 14 discrete channels are: [[Image:sound-10 2.svg|thumb|right|300px|Setup with point surround channels]] *Five front speakers: Left Wide, Left, Center, Right and Right Wide *Five surround channels: Left Surround Diffuse, Left Surround Direct, Back Surround, Right Surround Diffuse and Right Surround Direct *Two LFE channels: LFE Left, LFE Right *Two Height channels: Left Height, Right Height The ''.2'' of the 10.2 refers to the addition of a second subwoofer. The system is bass managed such that all the speakers on the left side use the left sub and all the speakers on the right use the right sub. The Center and Back Surround speakers are split among the two subs. The two subs also serve as two discrete [[Low-frequency effects|LFE]] (Low Frequency Effects) channels.
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