Dolby Atmos (DCP) vs Dolby Atmos (Blu-ray and UHD)

[Onti]

Let's say I have a DCP with Dolby Atmos, for example Mad Max: Fury Road, and the Blu-ray release of the same movie. What happens if I run both on a movie theater? Will I hear the same channels? (Dolby Atmos allows up to 128 audio tracks) I don't know if the Blu-ray (and UHD) releases come with a downmix.

[dvdmike]

They should be the same, but home releases are normally near field

[bendermac]

They should be the same, but home releases are normally near field

Nope!

Theatrical Atmos is not the same as Home Atmos.

Home Atmos is downgraded to 4 or 6 high channels. Also the objects are far less. But if done properly it wont make a major difference and can rock your house.

[dvdmike]

Sorry the same as in intent

[Onti]

They should be the same, but home releases are normally near field

Nope!

Theatrical Atmos is not the same as Home Atmos.

Home Atmos is downgraded to 4 or 6 high channels. Also the objects are far less. But if done properly it wont make a major difference and can rock your house.

Interesting! But what do you mean by "4 or 6 high channels"? Less objects when you watch any movie in 4K UHD? Due to compression? You mean there's not enough bandwith for an untouched theatrical track?

A better example would be The irishman (which has a Dolby Atmos track, like Criterion's Blu-ray) Netflix keep their original movies almost exclusively on the streaming platform to attract new customers, for this reason The Irishman had a limited theatrical release. Therefore, what would be the point of having a different mix via streaming? It would be understandable if the reason were storage limitations. 90% of people have seen this Scorsese movie at home (via streaming or thanks to Criterion's Blu-ray release).

[stwd4nder2]

From what I understand the theatrical version of Atmos supports more objects, but most mixes don't even reach the maximum number of objects for the home version. So differences should be minimal, if there even are any. But it will vary from mix to mix.

[dvdmike]

A lot of the home ones aren't actually object based are they? Wasn't that on AVS or something?

[stwd4nder2]

A lot of the home ones aren't actually object based are they? Wasn't that on AVS or something?

There's a lot of lazy mixes out there (*cough* Disney *cough*) that just use objects to create channels where ceiling speakers would go in a standard atmos setup instead of using moving objects.

[spoRv]

AFAIK:

- most of DTS:X (apart few foreign movies published in US that I can't recall for which single label) are not using objects, but only channels, locked to 7.1.4 at most
- most of the Atmos are locked too at 7.1.4 speakers, apart few notable examples (Gravity comes to mind, but my memory lacks, a lot!) where the objects move around a lot
- few Atmos and even less DTS:X use front wide speakers

Taking in account that there are a bit more than one hundred DTS:X movies and few hundred Atmos ones, I guess the ones that use more than 7.1.4 speakers are few dozen at most!

[stwd4nder2]

AFAIK:

- most of DTS:X (apart few foreign movies published in US that I can't recall for which single label) are not using objects, but only channels, locked to 7.1.4 at most
- most of the Atmos are locked too at 7.1.4 speakers, apart few notable examples (Gravity comes to mind, but my memory lacks, a lot!) where the objects move around a lot
- few Atmos and even less DTS:X use front wide speakers

Taking in account that there are a bit more than one hundred DTS:X movies and few hundred Atmos ones, I guess the ones that use more than 7.1.4 speakers are few dozen at most!

There's definitely more then a few dozen. I don't have a Trinnov with Atmos viewer myself to test stuff, but judging from what I've seen online moving objects is starting to become more of a norm then with early mixes. 
Can't speak for any DTS:X mixes, I don't think Trinnov ever updated their viewer to support it.