Glossary of TV terms

5.1, 6.1, 7.1. Three popular surround-sound speaker configurations. A 5.1-channel system has three front speakers, a left and right surround speaker, and a subwoofer. A 6.1 setup adds one rear speaker; a 7.1 system adds two.

Front projector. This compact device displays a high-definition image on a large wall or screen like a movie-theater projector. It's best for when you want a giant picture in a dedicated home-theater room. Is your room bright? Then forget it. The picture will look washed out.

HDMI. High-Definition Multimedia Interface, an all-digital audio/video connection. It's the de facto standard for high-def consumer equipment. By using a single cable for audio and video connections, it simplifies HD setup. You'll need an HDMI cable ($10 to $60, depending on length) to connect your HDTV to a cable or satellite box.

Rear-projection TV. A bulky HDTV set that costs less than an LCD or plasma model. But it's more expensive in the long run because its pricey bulb must be replaced every two to three years.

Surround sound. A multi-channel audio system that uses a special receiver and multiple speakers to envelop the listener in sound, simulating a movie-theater experience.

1080p. The highest HD resolution available on consumer TVs. It displays 1920 by 1080 pixels. A 1080p set produces a somewhat sharper picture than lower-priced 720p/1080i sets.

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