Extracts 5 audio channels from a stereo source:
- Three for speakers at the front - left (L) and right (R) at 22-30°, and center (C).
- Two for surround speakers at 90-110° to the side or rear - stereo surround left (LS) and surround right (RS).
- One low-frequency channel using a sub-woofer (Sub).
- Describes the Dolby Prologic II matrixed Surround systems, with stereo rear surround channels.
- Surround Sound speaker placement: The front speakers should be placed at the edges of the screen, toed in to face the central listening location, and the tweeters should be ear height. The center speaker should be placed behind the screen (when using projection) or over or under a tv, and as close to ear high as possible. Rear channel speakers should be placed high on side walls, slightly behind the listening position, and should have a di-pole construction.
