On IMAX and Large Screen evolutions - AVS Forum
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post #1 of 4 Old 11-01-2013, 04:27 AM - Thread Starter
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There are comments about IMAX "going Digital". The topic is actually a lot more complicated. For smaller venues they have gone Digital. For larger ones they have gone Hybrid, where they have both 15/70 and Digital projectors in the booth since fewer and fewer releases are being released in 15/70. The large venues are awaiting the release of the IMAX dual-Laser (Digital) projector which should be able to fill and at least planned to exceed some of the capabilities of 15/70 in the large screens.

A very good video on the upgrade of one of the large screens to hybrid:

Go to Youtube and search "IMAX Melbourne upgrade" - our Aussie friends again.

- 2k Digital Projectors
- Digital 28m wide by (up to) 15m high depending on aspect ratio
- 15/70 32m wide by 23m high (for 15/70 films)
- 15/70 32m wide by (varies) high depending on aspect ratio (for Hollywood films)

A Hollywood release in 15/70 was always letterboxed and was 32*17.4 sq m or 556 sq m (75% of the screen).

The digital image maxes out at ~57% of the Melbourne screen size (420 of 736 sq m).

Both can be less depending on the aspect ratio (but will remain proportional)

The Digital image will remain 75% of the comparable 15/70 image size (420/556 or 57/75 ratio).

Which only by chance for this venue is 75% Digital size OF the 75% 15/70 Hollywood use OF the 15/70 screen size.

For other smaller (but still larger than multiplex) venues such as Navy Pier both the 15/70 and the IMAX Digital projection sizes are the same.

The screen use percentages will vary for other screen sizes.

Digital 2*6.5K watt lamps
15/70 GT 2*15K watt lamps

The 15/70 Hollywood images can but not necessarily will be ~2 times brighter taking the 2.3 times greater lamp output and then scaling down for the 25% larger image size. All approximate since projector outputs are not related on an absolute basis and 15/70 can be produced to be less bright and use the "dynamic range" of the available output differently (and 2D vs 3D and ...). Digital can't push any harder at these image sizes.

IMAX does have a dual-Laser projector in development intended to go into their Large screen venues. Prototype demonstrations were scheduled for fall 2013 with first delivery in fall 2014 although it will be very tight to achieve those targets.
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post #2 of 4 Old 11-01-2013, 04:40 AM - Thread Starter
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May as well clarify in terms of brightness before anyone points it out (or in case anyone doesn't know).

For 2D IMAX uses BOTH digital projectors but only one 15/70 bulb/path. For all intents the brightness will be the same.

For 3D both Digital and 15/70 fire up both paths. Brightness is far more important in 3D because of the dimming effect of the polarizers used at the projector and glasses. 15/70 3D will be significantly brighter and more pleasurable in 15/70 3D than in Digital 3D.
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post #3 of 4 Old 11-27-2013, 01:29 PM - Thread Starter
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IMAX has announced that they will have a new 12 channel discrete sound system deployed along with their new Laser system which was demonstrated early this month (Nov 2013).

Given their relationship with Barco this is likely a re-badged Auro sound system.

Here is the reply from IMAX to the question of whether they were evolving their sound system.

Dear xx xxxxxxx,

IMAX is currently in development for its next-generation laser projection system, which will feature a new proprietary sound system upgraded to 12 discrete channels plus sub-bass to produce an auditory experience that is even more powerful and precise.

In the new systems, the additional side channels will supplement IMAX’s ability to reproduce sounds originating from points in between front and rear loudspeakers while the additional overhead channels will improve the system’s ability to position sounds above the audience. The result will be the most visceral sound experience available.

IMAX is also committed to providing a consistent quality sound experience. The new system will feature IMAX’s patented automated multi-point tuning process that ensures each system is optimized for the specific auditorium in which it is installed and runs a daily calibration test using high performance microphones permanently located within the theatre to ensure the audio system is always running at peak performance.


Best regards,
IMAX Corporation
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post #4 of 4 Old 11-27-2013, 10:36 PM
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Interesting...

No subwoofer I've heard has been able to produce the bass I've experienced in the Corps!

Must..stop...buying...every bluray release...
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