Should you care about Dolby Atmos support coming to Apple TV?
When tvOS 12 hits the Apple TV 4K in the fall, it will be the only streaming device that has both Dolby Atmos and Dolby Vision on board. Apple made a big deal about the technology coming over to its streaming box, but what does it mean?
Here's a quick breakdown of what Dolby Atmos brings to the table and whether you not you should care about it.
What is Dolby Atmos
To fully explain how Dolby Atmos functions, I'd probably need a couple of pages, but to save us a bit of time, here's an extremely simplified version.
Audio in a movie is typically split into channels, such as left, right, center, etc. These channels direct the sound to go to certain speakers. If you hear two people talking, likely their voices are more prominent in the center channel (AKA the center speaker). If there's a car crash off-screen to the left, you'll like hear that noise coming from the left channel and the left surround channel, thus allowing our brains to process where the sound is coming from and giving us a sense of direction.
Dolby Atmos allows sound engineers to split the audio into "areas" as well as channels. So if a gun goes off to the right of the screen, the sound engineers can designate the sound is coming from the "rear right corner," rather than the right channel, which by extension, comes from the right speaker. Basically, it gives the sound designers more flexibility to direct sound to specific locations and lets them control the audio's presence much more directly. This sounds simple enough, but the difference between your standard 7.1 surround sound system at home and the system in your local movie theater is huge.
Since 7.1 surround sound systems have been making their ways into homes more and more, consumers have been craving that authentic movie theater sound for everything they watch at home and Dolby Atmos is able to provide that experience you'd normally only get at a theater.
In short, if you have everything you need to take full advantage of Dolby Atmos, your movies are going to sound amazing, and the audio will almost take on a life of its own, as it fills the room in a much more organic way. The sound will truly feel all around you, not just on the sides or behind you, but even above and below you to an extent.
What do you need for Dolby Atmos?
Speaking of which, if you want to take full advantage of Dolby Atmos; you need quite a bit of hardware to make it work.
First of all, the source of the audio needs to have a Dolby Atmos soundtrack, meaning at home, the Blu-ray or digital movie format you're watching.
Second, you'll need that source to be coming from a device that supports Dolby Atmos, like your Apple TV 4K running tvOS 12.
Lastly, you need speakers that supports Dolby Atmos, and since this is a newer format, you'll likely need more modern speakers.
Do iTunes movies even have Dolby Atmos?
As of right now, probably very few, if any, of the movies you have purchased on your Apple TV employ Dolby Atmos; however, Apple isn't throwing you out to the cold.
Much like they have been doing with 4K HDR content, if you purchase a movie on iTunes that later on gets a Dolby Atmos soundtrack, Apple will upgrade your version free of charge.
Is it worth upgrading all my equipment?
That mostly depends on how much you love audio. For the vast majority of people, Dolby Atmos won't make enough of a difference to justify buying a new sound system.
Of course, if you are a diehard audiophile, and you've been waiting for Apple to make this move, having Dolby Atmos and Dolby Vision on the Apple TV 4K pretty much makes it the ultimate media streaming device capable of delivering that true cinema experience you crave.
Plus, as I mentioned before, if you buy a lot of your movies and other media through iTunes, Apple has got your back offering free upgrades if and when Dolby Atmos soundtracks come out for the titles you own. Thus, its a pretty great way to future-proof your media collection.
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Luke Filipowicz has been a writer at iMore, covering Apple for nearly a decade now. He writes a lot about Apple Watch and iPad but covers the iPhone and Mac as well. He often describes himself as an "Apple user on a budget" and firmly believes that great technology can be affordable if you know where to look. Luke also heads up the iMore Show — a weekly podcast focusing on Apple news, rumors, and products but likes to have some fun along the way.
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Would two Apple Homepods be able to take advantage of this feature?
As of right now, no. HomePod does not support Dolby Atmos
I really hope Apple is working on this. Given that Tomlinson Holman is an employee at Apple, who invented THX and 10.2 channel sound system, it wouldn't be a stretch. Ideally, I would love a new HomePod in a sound bar form factor that can emulate Dolby Atmos effect, with option to add more HomePods to get true surround sound.
Meanwhile Hulu continues to be 2 channel stereo only. Remind me again why Hulu is popular, or is it.
Not trying to be a **** or anything, but the reality is Average Joe and Jane could give 2 **** about any of this. Of course having Dolby Atmos would be awesome, but for most (like myself), 2-channel stereo only is enough for them. So it doesn’t surprise me that Hulu hasn’t made much effort to do more.
The biggest benefit you'll notice with Atmos or the competing DTS:X is that it uses either in ceiling speakers or sound bounced off the ceiling by speakers firing upwards to give overhead sound effects like rain, things flying over you, etc. The rest is definitely a benefit for sound engineers though. From reading various home theater articles on it the impression is given that they no longer need to mix to channels at all and instead via software and the encoding say "I want this sound to come from right here" and it's up to the user's individual system to decode that and reproduce it. If the system doesn't support Atmos or DTS:X then at least in the case of a disc the audio will fall back to a DTS Master or Dolby TrueHD type mix with discrete channel mixing.
While the article gives a good consumer level information, I think it could be expanded a bit. Dolby Atmos is not an entirely new system like Dolby Digital was. It piggybacks off of Dolby Digital Plus or Dolby TrueHD, by adding support for up to 128 audio objects with meta data for moving audio objects around. Dolby Digital Plus is a compressed format, with support for 9.1.6 (9 traditional + 1 subwoofer + 6 overhead) channels using up 6.144 Mbps of bandwidth. Apple TV running tvOS 11 supports 7.1 channel Dolby Digital Plus. Dolby TrueHD is a lossless format that can use up to 18 Mbps. Current Apple TV hardware does not support Dolby TrueHD and since Apple TV is a streaming device, it will probably remain that way. I also read that you will need HDMI 2.1 to get 4K HDR with Dolby Atmos using Dolby TrueHD. Apple hasn't disclosed whether tvOS 12 will increase the number of channels from 7.1 to 9.1.6. I suspect it will be upgraded to 7.1.2 at least (but ideally full 9.1.6) since overhead is one of the major draws of Dolby Atmos. The easiest way to enjoy Dolby Atmos is sound bar that supports Dolby Atmos. These sound bars have many speakers facing many directions (similar to HomePod) and typically includes a subwoofer. They work by bouncing the sound against the walls and ceiling. So the effect isn't as immersive and realistic as having several discrete speakers. But they don't require complex wiring and much cheaper (about $1000 and up). Few streaming services offer Dolby Atmos already, including Netflix and Vudu. Their tvOS apps will need to be updated, but I think we will get at least some streaming contents from day 1. Three other popular streaming services, Amazon Prime, HBO, and Hulu, do not offer Dolby Atmos contents yet.
I’ll be taking advantage of it. . . in 5-6 years when not only will I have the internet speeds to support 4K streaming, but actually buy that 55” LG 4K/HDR OLED that I have to sacrifice an arm and a leg at the moment. I’m still watching TV at 720p from a ATV 4K and have no issues with it.