Dolby Atmos is designed to deliver depth of sound stage in the vertical space. Meaning it increases the height of the sound stage. Imagine the sound of rain falling from the ceiling, a helicopter hovering overhead or someone shouting from a rooftop. There is a whole bunch of tech stuff on their site which is mostly geared towards selling producers on the effect but needless to say when working well with great content, it can add a dramatic effect to your listening experience.
What kind of speakers should I use for Dolby Atmos?
According to Dolby you can use any pair of in-ceiling speakers or special Atmos speakers that have drivers pointing UP at the ceiling. I prefer the in-ceiling configuration but some might argue the down firing sound might interfere with the soundwaves coming from your main left and right channels. Most people would not notices is my guess.
Bottom line, if you love your main speakers as they are get a good pair of in-ceiling or flat panel speakers for the height. If you're in the market for a new pair of speakers there are some really nice Atmos speakers available on the market today. Don't forget you need an Atmos enabled receiver as well.
My favorite Atmos speaker is made by Pioneer believe it or not. No haters please. LOL (shown above)
Visit Dolby Labs Atmos page for more information.