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Until recently, the best way to watch a movie was to go to a movie theater. The introduction of VCRs made it easy to rent or buy movies and watch them at home, but TVs just didn't compare to movie theaters' huge screens and surround-sound systems. Not only did TVs have comparatively tiny screens and lower quality speakers, formatting a movie to fit the screen got rid of a substantial part of the picture.
Now, more and more people are turning their ordinary TV rooms into home theaters. This used to involve a projector and a screen, and it was too expensive for most people to afford. But advances in technology have given people more choices for home theater setups, and some people find that a home theater is quieter and more convenient than a movie theater -- and the picture and sound are great.
Home theater is difficult to define -- it's really just a vague term for a particular approach to home entertainment. Generally speaking, a home theater system is a combination of electronic components designed to recreate the experience of watching a movie in a theater. When you watch a movie on a home theater system, you are more immersed in the experience than when you watch one on an ordinary television.
To see how home theaters do this, let's take a look at the original model -- the movie theater. When it comes to picture and sound, the theater can offer an amazing experience we just don't get at home. That's usually why people will pay to go to the movies, even though renting a movie is cheaper. There are a few main components that make watching TV and going to the movies very different.
?One of the biggest differences is the sound experience. When you go to see a movie in a quality movie theater, you'll hear the music, sound effects and dialogue not just from the screen, but all around you. If you've read How Movie Sound Works, you know that a standard movie theater has three speakers behind the screen -- one to the right, one to the left and one in the center -- and several other speakers spread out in the rest of the theater. In this surround sound system, you hear different parts of the soundtrack coming from different places. When somebody on the left side of the screen says something, you hear it more from the left speaker. And in a movie like "Star Wars," you hear a rumbling swoosh travel from the front of the theater to the rear as a spaceship flies toward the camera and off the screen. You are more involved in the experience of watching a film because the world of the movie is all around you.
?The second chief component of the theater experience is the large size of the movie screen. In a theater, the screen takes up most of your field of view, which makes it very easy to lose yourself in the movie. After all, you're sitting in the dark with only one thing to look at, and everything you're looking at seems much bigger than life.
?We also enjoy going to the movies because we can see everything so well. Film projectors present very large, clear pictures. The detail is much sharper than what we see on an ordinary 19-inch television, and the movement is much more fluid. We may not consciously recognize this, but it does make a significant difference in how we enjoy a movie. When we can see more detail, we are more engrossed in the world of the movie.
The basic idea of a home theater is to recreate these elements with home equipment. In the next section, we'll look at an overview of what you need to get started.
In the last section, we saw that the major components of a movie-theater experience are a large, clear picture and a surround-sound system. To build a home theater, then, you need to recreate these elements. At the bare minimum, you need:
?A large-screen television (at least 27 inches across, measured diagonally) with a clear picture
?At least four speakers
?Equipment for splitting up the surround-sound signal and sending it to the speakers
?Something that plays or broadcasts movies in surround sound, preferably with a clear picture
And, of course, you'll need a room where you can arrange all this stuff.
There are any number of ways you can meet these criteria. In the end, your home theater system depends on how much money you're willing to spend and how important certain areas of performance are to you.
If you're not looking to spend much money and already have a good-sized television and a stereo system, you can upgrade your entertainment system into a fairly crude home theater with a couple of extra speakers and a few other inexpensive components (see Accessing the Surround Channel to find out how). If you invest in a basic surround-sound system and a new DVD player, you might spend $500. For a more advanced system, with a larger television and an advanced sound system, you might spend about $8,000. For $30,000, you could set up a real theater, with a projection television, built-in speakers and bolted theater seats (and maybe a concession stand).
In the following sections, we'll look at the different options for televisions, surround-sound receivers, speakers and video sources. We'll find out the advantages and disadvantages of different types of equipment, as well as the price range and long-term benefits. We'll also look at some of the extra components you can add to put the finishing touches on your home theater system.
The main thing that sets a home theater apart from an ordinary television setup is the surround sound. For a proper surround-sound system, you need two to three speakers in front of you and two to three speakers to your sides or behind you. The audio signal is split into multiple channels so that different sound information comes out of the various speakers.
The most prominent sounds come out of the front speakers. When someone or something is making noise on the left side of the screen, you hear it more from a speaker to the left of the screen. When something is happening on the right, you hear it more from a speaker to the right of the screen.
The third speaker sits in the center, just under or above the screen. This center speaker is very important because it anchors the sound coming from the left and right speakers -- it plays all the dialogue and front sound effects so that they seem to be coming from the center of your television screen, rather than from the sides.
The speakers behind you fill in various sorts of background noise in the movie -- dogs barking, rushing water, the sound of a plane overhead. They also work with the speakers in front of you to give the sensation of movement -- a sound starts from the front and then moves behind you.
But how do all these sounds get split up? This is the job of the audio/video receiver, which is the real heart of a home theater. In the next section, we'll see what this component does.
The Receiver
The audio/video (a/v) receiver and amplifier assembly in a home theater does the same job as the receiver and amplifier assembly in any stereo system: It receives signals from various input devices, like a VCR, DVD player or satellite dish. It interprets and amplifies those signals and then sends them to output devices -- your television and sound system.
A home theater a/v receiver and amplifier assembly actually combines several different components. Some even have a DVD or other media player built in. You can generally assemble a superior home theater system by buying the components separately, but most people buy one unit that does all these jobs because it is more cost effective.
The receiver's components are:
?Audio/video inputs for video sources (DVD player, DVR)
?Preamplifier
?Surround-sound decoder (aka signal processor)
?Power amplifiers for each sound channel
?Outputs for speakers and television
The path of the audio and video is pretty straightforward. The source component (DVD player, DVR, etc.) feeds a signal to the receiver unit. You choose which input component you want to feed to your output unit, and the preamplifier selects this signal and amplifies its line level a little bit.
The receiver is at the heart of a typical home theater system.
The receiver sends the video on to your television and sends the audio to the decoder. The decoder sorts out the different sound channels from the video signal, and then sends the information to amplifiers for each sound-channel output. These amplifiers are connected to the appropriate speaker or speakers.
Digital decoders and analog decoders handle the job differently. Digital surround sound is quite simple: When a company is producing a Dolby Digital® program, for example, they encode six separate audio channels, specifically balanced for a Dolby Digital speaker setup. A Dolby Digital surround-sound decoder recognizes these different channels and sends them to the appropriate speakers.
Analog surround sound is something else altogether. The different analog surround-sound channels are actually extracted from the two standard audio channels that make up any ordinary stereo signal. This is commonly called 4-2-4 processing because the encoder essentially takes the rear and front channels and works them into the ordinary stereo channels, and a surround-sound decoder separates the four channels out again. See How Surround Sound Works for more information.
There are a wide range of audio/video receivers available. These receivers are often sold with all the speakers you need, as a complete home theater system. These systems run as low as $250 and as high as $2,500.
One of the most important differences between audio/video receiver models is what surround-sound formats they support. In the next section, we'll find out what the different formats are and see what they offer.
Which Surround-sound Format?
In the last section, we saw that audio/video receivers decode the surround sound information encoded in video signals and drive the appropriate speakers. Different audio/video receivers are equipped to decode different formats. Today, there are two main sources for home theater surround-sound formats -- Dolby Laboratories and Digital Theater Systems. Dolby Laboratories formats include various versions of Dolby Digital® and Dolby Pro Logic®. Digital Theater Systems has created a range of DTS Digital Theater Sound formats.
Between the two companies, there is a dizzying array of sound options. So here's what you need to know:
?DTS encoding uses less compression than Dolby encoding. This means that DTS sound is clearer and sharper.
?However, DTS encoding is also less commonly used on DVDs and television broadcasts.
?Most DVDs have some Dolby sound options, and some also offer choices for DTS sound.
Fortunately, a lot of a/v receivers support a wide range of Dolby and DTS options. When you're choosing a receiver, you should decide two things: whether you want DTS support and how many speakers you want to use for your surround-sound setup. The most common options are 5.1, 6.1 and 7.1 surround, named for the number of channels. The ".1" indicates a channel for a subwoofer. The subwoofer channel carries low-frequency sound to give a bass boost and create a rumbling effect for certain special effects sounds, such as explosions and trains. These are the typical speaker setups and formats that will support them:
?5.1 (5 speakers + subwoofer) A 5.1 surround-sound setup includes left, center and right front speakers. It also has left and right surround speakers. Dolby Digital, Dolby Pro Logic II and DTS 5.1 will all support this format. DTS 96/24 uses a 5.1 channel format to play audio at the same sampling rate at which it was recorded.
?6.1 (6-7 speakers + subwoofer) A 6.1 setup takes all the speakers from 5.1 and adds a rear channel. Dolby Digital EX uses this format, splitting the one additional channel into left and right rear speakers. DTS-ES, on the other hand, uses a rear center speaker. DTS Neo:6 can also support a 6-channel format.
The sound system is what really makes a home theater experience complete, but the first thing you'll probably notice when you sit down in front of a theater setup is the television. In the next few sections, we'll see how televisions fit into the home theater.
flat panel display).
LCD Vs. Plasma
LCD and plasma are the two primary technologies used in flat panel TVs. The major differences between them are glare, weight, power consumption and color quality. For a summary, see LCD vs. plasma.
The HD Resolutions
The highest-resolution HDTV is 1080p (1,080 progressive scan lines), while TV and cable channels broadcast in 720p and 1080i, the lower HD resolutions. As yet, there are no broadcasts in 1080p; however, Blu-ray discs are 1080p. Blu-ray provides the sharpest resolution, although 720p and 1080i content is quite good and often not that easy to tell the difference. For resolution details, see HDTV and progressive scan.
HD Versus SD - What Will You Watch?
If you plan to watch mostly HD channels, any HDTV set you like in the showroom should work well. However, if you plan on watching VHS tapes, standard DVDs, old movies or TV shows on cable that are not in high definition, all HDTVs are not the same. The better set upconverts and stretches old movies from their original square format (4:3) to the TV's wide screen (16:9) and higher resolution so that they look as good as they did on an analog CRT TV. That may sound strange, but analog TVs were engineered for one format, and only one format was delivered.
If you plan on watching a lot of SD content, ask to view SD channels before buying. Showroom TVs are always displaying HD, and if all the TVs accept the same signal, sales reps may be very reluctant to switch every TV to SD. Quite often, a Blu-ray animated cartoon is running because Blu-ray is the highest resolution (1080p), and cartoons have highly saturated colors that look more dazzling.
Size Makes a Difference
There is an enormous amount of complex processing that takes place within the set, and the larger the screen, the more jagged edges, pixelation and other visual artifacts are noticeable. It takes a high-quality 60" TV to look as good as any 32" set (see deinterlace, cadence correction and dynamic noise reduction).
HD Ready and HD Built In
"HD Ready" sets support one or all of the HDTV formats but have no built-in tuner. A set-top box from a cable or satellite company is required. "HD Built In" means that the TV has an HD tuner and can receive HD signals from an antenna.
Wall Mounting
Although all flat panel TVs can be wall mounted, models 40" and above require a strong support. The wall bracket must be bolted into the studs of sheetrock and plaster walls by an experienced installer. See HDTV display modes, upconvert, aspect ratio, Blu-ray, home theater and rear-projection TV.
Flat-Screen TV
Plasma or LCD?
What You Need to Know
If you?ve been sitting on the flat-screen fence, it?s a good time to jump off. The biggest price drop has already happened: On average, prices fell more than 20 percent last year; a $9,600 50-inch Hitachi plasma can now be had for $4,300. Although prices will continue to drop at a projected 10 to 15 percent annual rate, you can buy now and feel safe that you won?t look like a fool in a few months.
And the shift to high-definition television is finally happening, with networks airing 4,800 hours this year, including Lost and ER (on cable, much of ESPN is already HD, as is HBO). Many flat-screens have HDTV as standard, so you?ll get a better as well as bigger picture.
If you decide to buy a flat-screen TV, the main choice you?ll face is, plasma or LCD? Aficionados debate the two technologies endlessly. All you need to know is that unless you play video games constantly, plasma is the way to go. LCDs have a slightly clearer picture, but plasma is cheaper and bigger (up to 70 inches, as opposed to 50). Don?t be scared off by stories of ?image burn? on plasmas (which happens when the pixels inside the TV get hot enough to scorch an image that?s been displayed for several hours?say, Super Mario or CNN?s ticker?permanently onto the screen). You can easily avoid this with a screen saver (built in on some models)?or by just turning the damn TV off occasionally.
Unless you have a dedicated home theater, stick to the 42-to-55-inch range. Get an HDTV tuner built in so you don?t have to buy an extra box. Same goes for a surround-sound decoder, which lets you hook up the TV to multiple speakers. Forget a space-hogging stand. Get a multidirectional wall mount instead.
When you judge picture quality, stand about ten feet away to check brightness and contrast. Look at the edges of the images as they move. If they bleed, go to another TV.
What You Don?t Need to Know
During your research, you?ll encounter many sci-fi-sounding terms. Cd/m2 refers to screen brightness: Understand that this count should be high (at least 400:1), that?s all. Don?t worry about aspect ratios?they refer to the dimensions of your TV?s wide-screen mode. Ditto for progressive scanning, which makes the picture richer?most HDTVs have it.
Don?t worry about how thin the TV is: They?re all just inches thick. Ignore talk of calibration and the ISF to optimize color. TVs come with adjustable presets. If you?re fussy, call a professional to set perfect tones.
Sales folk will hawk home-theater systems and treat you as an audiophile. But not everyone needs surround sound. Live with the TV speakers for a month, then decide if they?re good enough. You can always install more later. Unless you live in the suburbs, don?t bother with rear-projection HDTVs. They?re inexpensive but too big for most New York apartments. And don?t worry about SED or OLED TVs?the next generation of flat-screen technology?until at least 2006, when the price will come down.
(1) Best
Hitachi 55HDX61 55-inch plasma HDTV, $8,000
(2) Very Good
Toshiba 42HPX84 42-inch plasma HDTV, $4,500
(3) Budget
Norcent PT4231 EDTV, $1,700
LCD
LCD is short for liquid crystal display. The screen is composed of thousands of pixels between two polarizing filters. The picture is created by the pixels' reaction to an electric current passing through them.
Digital
LCD TVs feature a digital tuner, enabling them to receive digital over-the-air signals, and decode digital and HD signals from cable and satellite providers as well.
Inputs
LCDs provide one or more high-definition multichip interconnect, or HDMI, inputs for various devices. These connections are optimal for displaying high definition video, as well as component, S-Video, computer and USB inputs, depending on the make and model. The TVs also have standard and digital audio outputs.
LED
Light Emitting Diode, or LED, technology twinned with LCD displays makes for a crisp picture. The LEDs replace the fluorescent backlight in traditional LCD displays.
Compare With Plasma
LCDs use less energy than plasma TVs and are generally lighter. In addition, LCDs are typically very thin, which makes them easier to install, especially if you want to hang the TV from a wall.