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One of the first pieces of tech specs you'll run into when building your own dream home theater is "5.1" , "7.1" and to a lesser extent "6.1" speaker systems. Typically a home theater system and most movie house systems consisted of a center channel, a pair of left and right speakers, side or surround speakers, and a subwoofer. Each set of speakers in a 5.1 setup have a different function. The center channel provides you with a clear dialogue channel. Optimum surround sound home theater reproduction places heavy demands on the center channel speaker, which in many respects is the main speaker in the system and often handles 50% or more of the program material. It is no place to compromise and settle for second best. Normally this speaker is placed either on top or just below the screen, and even behind the screen in some in some projector systems with an acoustically transparent screen.
The left and right speakers carry the bulk of the sound and music. Most effects sounds, music and score and a good portion of the background sounds. These are typically your largest and most expensive speaker pair. They have the greatest tonal range, from mid-low to high range sounds are handled by this pair of speakers.
The surround speaker open up the sound stage, allowing you to experience those effects that put you in the action of the movie, cars approaching you from the side during a car chase, spaceships whizzing be around you, or the menacing sounds of the jungle wildlife in the Serengeti.
The subwoofer brings in the bass, creating those chest-pounding explosions and bringing to like thud and crash. Positioning of the subwoofer does not really matter all that much as the human ear does not accurately position low frequency sounds. The subwoofer is the ".1" in "5.1", meaning 5 speakers and one subwoofer.
This was your typical setup and all was well, but along came 7.1 and to a lesser extent 6.1 adding one or two speaker to in the rear of the listening area. This addition will add a more enveloping sound and open up the soundstage even further, allowing for the illusion of being part of the film. Some enthusiasts do not feel that the rear speakers are necessary at all. In fact all DVDs have no more than a 5.1 soundtrack. Some newer high end receivers can translate a 5.1 signal into a 7.1 signal such as Dolby Pro-Logic II. This is done by using mathematical algorithms create a separate 6th audio channel that is then pumped to one or two rear speakers (if they are present).
At this point either 6.1 or 7.1 was nice, especially if you had a couple of extra speakers you could throw in the back. Matching timbre with the rest of the speakers is not very important when adding rear speakers, so really any decent loudspeakers would do. Then along came Blu-Ray and HD-DVD, these formats would hold much more data and made it possible to add 7 discrete channels (each channel having a separate and distinct signal), plus a low frequency effects channel LFE (subwoofer). At this point fewer than about 20% of Blu-Ray releases have a 7.1 audio format, studios are aware that most people still have 5.1 systems, but this trend is changing and would speculate that in just a few years 7.1 will be the standard audio format for movie releases and home theaters.
I'm Roger Sandoval, a Home Theater enthusiast, who finally built his own dream home theater, but I'm always upgrading and checking out new equipment. I love to share my advice to how to buy home theater equipment and where and how to buy plasma TVs and LCD TVs, I invite you read my LCD and Best Plasma TV reviews as well as reviews and all home theater equipment.
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