SACD: An acronym for Super Audio Compact Disc. SACD is a newer digital audio format that offers higher-quality sound and greater capacity than a CD.

satellite radio: A service that offers digital radio programming broadcast by satellite to your home theater or car. Satellite radio services such as XM Radio and Sirius offer more than 100 radio stations and charge monthly access fees.

sharpness: The fine details in the picture of a video display. Most displays enable you to adjust the sharpness setting.

short runs: Connections between home theater components that are sitting just a few feet from each other or at least in the same room.

single-layer disc: A DVD or Blu-ray disc in which you can store media on only one side of the disc.

sources: Home theater components (devices) that provide the content that you watch or listen to, such as DVD or Blu-ray disc players, DVRs, gaming consoles, CD players, AM/FM tuners, turntables, or home theater PCs.

spade lugs: U-shaped speaker cable connectors that fit behind a screw on a five-way binding post. Spade lugs provide one of the most secure cable connections.

speakers: Devices in a home theater system that supply the sound that you listen to. Most home theaters include a surround-sound speaker system with two front speakers, one front center speaker, two side speakers, two or four rear speakers, and a subwoofer.

streaming: A method of sending audio or video content in which the content plays while it is delivered over your home network, the Internet, or both.

subwoofer: A speaker in a home theater surround sound system that is designed to play low-frequency (bass) sounds. Typically placed along the front wall of the room.

surround sound: A feature in a home theater system that enables you to take full advantage of all the audio signals in your source content (such as television programs and DVD or Blu-ray movies).

S-video: A type of short-run analog video connection in which color and brightness are separated onto two separate signal paths, so the signal can bypass the display's comb filter. Typically results in a clearer picture than composite video (but not component video).