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2. Surround sound - Wikipedia

   en.wikipedia.org/wiki/Surround_sound

   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.

3. Digital cinema - Wikipedia

   en.wikipedia.org/wiki/Digital_cinema

   A solution is a temporary Virtual Print Fee system, where the distributor (who saves the money of producing and transporting a film print) pays a fee per copy to help finance the digital systems of the theaters. [68] A theater can purchase a film projector for as little as $10,000 [69] (though projectors intended for commercial cinemas cost two ...

4. IMAX - Wikipedia

   en.wikipedia.org/wiki/IMAX

   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.

5. 7.1 surround sound - Wikipedia

   en.wikipedia.org/wiki/7.1_surround_sound

   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 ...