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Infact the anti noise diagram is not out of context and it's an example. If you choose to ignore my other post that's your choice.
So tell me: what is the use of a center speaker? And why do you need rear speakers for ambience if you have a rear wall reflection?
I'm not ignoring your other posts. I've read them.
What is the use of a centre channel?
Virtually all dialogue will be assigned (i.e. mixed) to the centre channel. Actors may walk in and out of a scene and you may hear them pan from left to centre (or right to centre) as they enter a scene.
Centre channel is obviously mounted either above or below your TV.
Basically, to lock the apparent source of the dialogue to the TV, dialogue is normally assigned to the centre channel, so if you are sitting at the far end of the couch in your living room the dialogue will still appear to come from the TV and not the front speaker closest to you.
So why have more channels?
See Audiophile1811 comments:
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Wouldn't rear speakers be used to help create the feeling that sound or sounds actually "surrounds" you unlike a stereo system which relies on its soundstage, imaging, room acoustics, etc. to create, or rather, recreate surrounding sounds? As far as I know sound engineers setup the direction of music and sounds to specific channels in a 5.1 Surround Sound mix. So at least rear speakers serve some purpose since they don't reproduce the exact same sound every other speaker does, in a 5.1 mix that is. However, I am inclined to believe that a 5.1 or 7.1 system would be pointless for only stereo recordings.
If a scene is set in a large room (for example), then if you disconnect the centre channel, then you will probably hear a reverberant soundfield in the remaining speakers (front and rear) to give the illusion of the dialogue being created in a large room, assuming that is how the movie was mixed.
If a scene is set in the jungle (for example) then you may hear different jungle sounds coming from all 5 speakers to simulate the sound of being in the jungle. The 5 channels may all have some variety of jungle sound, but the 5 channels will all have a slightly different perspective. Since they are all slightly different they will not cancel each other out. When you are in a forest, obviously you can hear sound all around you, no?
Admittedly, there are A LOT of movie soundtracks with little or nothing in the rear channels.
Apparently some directors do not like surround sound (they feel it is too distracting) and like virtually all the sound to come front the front 3 speakers only.
Personally, for stereo signals, when listening to music on my surround sound system, I very rarely try to use the surround sound algorithms (Dolby Music, DTS Music, etc.) to generate fake surround sound. Normally, I listen to music in plain old stereo. Fake surround sound does seem to help some poorly mixed pop music by adding a fake sense of space.
If you don't like surround sound, I don't have problem with that. Personally, I prefer it for movies and music mixed in surround only
FWIW, I have mixed live and recorded music, and I've been practicing Electrical Engineering for approx. 25 years.