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Surround replay systems may make use of bass management, the fundamental principle of which is that bass content in the incoming signal, irrespective of channel, should be directed only to loudspeakers capable of handling it, whether the latter are the main system loudspeakers or one or more special low-frequency speakers called subwoofers.
However, whereas a 5.1 surround sound system combines both surround and rear channel effects into two channels (commonly configured in home theatre set-ups as two rear surround speakers), a 7.1 surround system splits the surround and rear channel information into four distinct channels, in which sound effects are directed to left and right ...
Since the 2010s, one of the increasing sources of competition for movie theaters is the increasing ownership by people of home theater systems which can display high-resolution Blu-ray disks of movies on large, widescreen flat-screen TVs, [80] with 5.1 surround sound and a powerful subwoofer for low-pitched sounds.
For example, a 100-watt, 1000 hour, 120-volt lamp will produce about 17.1 lumens per watt. A similar lamp designed for 230 V would produce only around 12.8 lumens per watt, and one designed for 30 volts (train lighting) would produce as much as 19.8 lumens per watt. [76] Lower voltage lamps have a thicker filament, for the same power rating.
Despite all the progress made since the creation of the universal health care system in 1988, there are still several public health problems in Brazil. In 2006, the main points to be solved were the high infant (2.51%) and maternal mortality rates (73.1 deaths per 1000 births). [419]
IMAX is a proprietary system of high-resolution cameras, film formats, film projectors, and theaters known for having very large screens with a tall aspect ratio (approximately either 1.43:1 or 1.90:1) and steep stadium seating, with the 1.43:1 ratio format being available only in few selected locations.