In addition, Atmos adds height speakers, but unlike Dolby Pro Logic IIz, they are designed to appear discretely in the mix and not be simply "matrixed" from the front channels. This, of course, is exactly what the promise of surround sound was supposed to be from the start. It's less like you're listening to individual speakers in a room, and more just being surrounded by sound. The result is a far more seamless surround effect. Even better, sweeps of sound (a helicopter flying around, say) can be far smoother, passing from speaker to speaker instead of from array to array. So, for example, instead of a sound occurring somewhere over your shoulder, the sound designer can place it precisely at your 8 o'clock. The array (multiple speakers) was necessary, given the size of the theater and the number of ears therein.Ītmos changes that, adding the ability to individually address all of the speakers in a theater - or at least, many more of them. The idea was the same: sound > speaker channel. In the theater, that same sound might have been sent to an array of speakers. In your home, a 5.1 mix might send a surround-sound effect to a rear speaker. There were a certain number of channels, and those channels were sent to specific speakers. Movie sound, until recently, has been mixed very similarly for the cinema to the way you hear it at home.
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