installing atmos speakers tmr, advice needed! - AVS Forum
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post #1 of 13 Old 08-11-2014, 03:43 AM - Thread Starter
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Lightbulb installing atmos speakers tmr, advice needed!

Hi guys,

i'm installing 2 pairs of JBL 8320 speakers as ceiling speakers for atmos.

what do you guys suggest of the position, where it should firing at.

The speakers have a 20° angled front baffle.

looking at dolby atmos whitepaper, it prefers to have the speaker firing at your position if i didn't get it wrong.

what do you guys think. need opinions, please voice in.

i attached a photo, see which one you prefer.
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Last edited by Wilber; 08-11-2014 at 10:00 AM.
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post #2 of 13 Old 08-11-2014, 07:55 AM
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From everything I have seen so far with Atmos, the ceiling speakers should be firing down towards the listening position. The height speakers if used in an Atmos speaker setup go up high on the front and/or back wall angled towards the listening position.


The placement from the listening position seems about right.

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post #3 of 13 Old 08-11-2014, 08:33 AM
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I'm current finishing a coffered ceiling or more like a coffered cloud specifically designed for Dolby Atmos.

My front ceiling speakers will be 5 ft in front of LCR and attached 10 ft above floor on ceiling. This equates to about 38 degrees on angle of depression from speaker to MLP. I will be using some speaker model from Triad which will have an angled baffle of 45 degrees. Will have center ceiling pair firing slightly behind 1st row seating straight to ground, and rears pair will be slightly in front of 2nd row headrest but will be at 39 degrees angle of depression for first row MLP.

Compromise to design was location of rear speakers. 95% of usage in room will be done by my wife and I. The design is perfect for 1st row but rear seating will see some compromises. I've been fortunate to have had some help to verify speaker locations from retired Dolby Engineer, so I am confident my set up will be fine.
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post #4 of 13 Old 08-11-2014, 10:06 AM - Thread Starter
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hi doublewing,

did checkout your thread last week but the speakers weren't up yet..
and i just checked again.. still no update of the speakers at the moment?

@oman321 ,

so have the speakers tilted 45 degrees and firing to me?
though i like the idea but putting acoustic treatment will be pita. this required lots of time for cutting the materials to shape to fit in the 45 degrees whereas left side would be "indirect firing down" but of course they are wide enough for dispersion.

dilemma, guys.. more suggestions please... time is ticking...
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post #5 of 13 Old 08-11-2014, 10:25 AM
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Look at my thread in this forum (I mounted speakers for AURO / ATMOS) and I got info from industry folks to guide me.

(Le Petit Trianon) thread
Le Petit Trianon V 3.0 (thebland) 7.2 --> 12.5

My Home Theater of the Month- Le Petit Trianon

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post #6 of 13 Old 08-11-2014, 02:04 PM
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Quote:
Originally Posted by Wilber View Post
hi doublewing,

did checkout your thread last week but the speakers weren't up yet..
and i just checked again.. still no update of the speakers at the moment?

@oman321 ,

so have the speakers tilted 45 degrees and firing to me?
though i like the idea but putting acoustic treatment will be pita. this required lots of time for cutting the materials to shape to fit in the 45 degrees whereas left side would be "indirect firing down" but of course they are wide enough for dispersion.

dilemma, guys.. more suggestions please... time is ticking...
I'm going to wait until I'm absolutely sure about processor, speakers, and eq.

If you look at coffer cloud........speakers will be in each corner front and rear and middle two will fire directly down slightly behind first row seating.

You have two fore-mentioned excellent examples of how to implement Atmos........I have 10.5 foot ceilings which allows me to be more flexible with placement. My resource who has helped me in my implementation has actually been involved with design of object based audio for the last 4-1/2 years so I'm confident I'm good to go.
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post #7 of 13 Old 08-12-2014, 04:34 AM - Thread Starter
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rather not much responses for this...

installation delayed that gives me some time to consider..
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post #8 of 13 Old 08-12-2014, 06:30 AM
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Just my 2 cents and a little fortune telling. I assume you are also using the JBLs for your side and rear surrounds? if yes then the direction we are headed is to add more sides, one forward and one behind the seated position. So use your JBLs there, wait a bit and there will be new ceiling Atmos speaker offerings. Or DIY. the JBLs are more directional and Dolby would like to see more disperse and diffuse sound off the ceiling. This recommendation is subject to change after I attend their presentation at CEDIA.
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post #9 of 13 Old 08-12-2014, 07:46 PM - Thread Starter
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thanks, but i bought them for atmos. can't possibly sell it away now or change plan.
is true that they want it disperse and diffuse so that it doesn't sound direct at all.
but since i bought it already, have to stick to plan.
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post #10 of 13 Old 08-12-2014, 08:13 PM
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I think BIG has it right. Use your new speakers for two pair on each side of your seating positions. Wire it up for the ceiling Atomos. Wait to find a speaker that offers diffuse rather directed sound. The ceiling speakers are effects speakers and from what I've read, Dolby doesn't want the sounds to be locatable so much as a sound effect from a general area.
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post #11 of 13 Old 08-12-2014, 09:47 PM
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Quote:
Originally Posted by Wilber View Post
but since i bought it already, have to stick to plan.
sell them buy something else. whatever loss you take is just one of life's lessons.
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post #12 of 13 Old 08-12-2014, 10:39 PM
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Quote:
Originally Posted by Wilber View Post
what do you guys suggest of the position, where it should firing at.
Point them at the listening position, as you have in your second drawing. If you have multiple seats, point each height speaker at the person furthest away (cross toe them) so that listeners aren't distracted by the nearby height speaker.

There will be an Atmos white paper coming out at CEDIA in a few weeks which will give installation recommendations. Don't know if you're willing to wait.

Sanjay
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post #13 of 13 Old 08-13-2014, 08:24 AM
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Agree with above. There just isn't enough info yet about Atmos or equipment available for it to be advisable at this point...

It is a much-hyped but not yet delivered product.
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