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For music surround channel information is intended to be more direct as in a soundstage there would be direct noise from all around and not ambience as in a movie setting. For this reason surround speakers should not be set up to be strictly diffuse. Optimally there should be discrete surround channels for diffuse and direct effects.
7.1 channel surround is another setup, most commonly used in large cinemas, that is compatible with 5.1 surround, though it is not stated in the ITU standards. 7.1 channel surround adds two additional channels, center-left (CL) and center-right (CR) to the 5.1 surround setup, with the speakers situated 15 degrees off center from the listener. [24]
The speaker(s) connected to the center channel are placed in the center of and behind the perforated projection screen, to give the effect that sounds from the center channel are coming from the screen. In many home surround sound units, the center channel is positioned above or below the video screen. [1]
Since low frequency resonances in a room have their points of maximum or minimum pressure in the corners of the room, resonant bass traps mounted in these positions will be the most efficient, [3] while porous traps are most efficient at the points of high particle velocity such as 1/4 the desired wavelength away from the wall. [4] Bass traps ...
For this reason dipole speakers are often used as surround channel speakers, where a diffuse sound is desired to create ambience. A dipole speaker works by creating air movement (as sound pressure waves) directly from the front and back surfaces of the driver, rather than by impedance matching one or both outputs to the air. As a result ...
The white square in the center of the diagram depicts the low-frequency speaker. Each black square depicts a loudspeaker. The center speaker in the top line of the diagram is used for dialogue. The left and right speakers on either side of the center speaker are used to create stereo sound for music and other sound effects in the film.
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New York University claims to have two 10.2 surround sound systems set up in their new $6.5 million music technology complex at Steinhardt School. One in a recording studio and one in a screening room. [6] [7] Products are already being sold to accommodate 10.2 surround systems such as in-wall speaker jacks. [8]