Dolby Atmos 7.2.4 in an 11x14 dedicated HT - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 31 Old 01-07-17, 01:26 AM Thread Starter
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Dolby Atmos 7.2.4 in an 11x14 dedicated HT

Let me start by saying I know the room is WAY smaller than ideal, but I have no other options. I am looking for input on the speaker placement with my current wall configuration as I do not have the room to precisely follow the Dolby Atmos guidelines and none of the walls can be moved. Since a picture is worth a thousand words, I am attaching a diagram that I think will explain my current plan. One obvious problem is that there is no room to place the speakers farther than a few inches behind the listening position in the rear row.

A few notes:
• This is a dedicated theater space
•Considering a Yamaha 3050, 2060, or 3060
• I want to optimize this for action and sci-fi movies
• I am adding a soffit around the sides and back into which speakers can be installed or hung from (as well as baffles)

I am very interested in knowing if Atmos will work with this type of available positioning and/or with a room this size.
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Dolby Atmos 7.2.4 in an 11x14 dedicated HT-theater-rough-diagram-v2.jpg  

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post #2 of 31 Old 01-07-17, 08:28 AM
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I would suggest going with only one row of seating first off. Second, I think that screen is going to be too large for that room. I'm not sure how good the separation is going to be with all of those speakers clustered together in such a tight space? Most of us have to make concessions and work with what we have though.
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post #3 of 31 Old 01-07-17, 10:25 AM
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Re: Dolby Atmos 7.2.4 in an 11x14 dedicated HT

Agreed. If you must have 2 rows, a 2 and 3 configuration would be better. The rear 2 corner seats will be pretty much unusable sitting in corners. The screen is definitely pushing and forcing front speakers into corners - which also precludes bass control in the room. Lastly, with the 2 rows, the front row head position is very very close to center front to back which will put you in all of the room modes and your bass response will be all over the place.

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post #4 of 31 Old 01-07-17, 10:33 AM
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Re: Dolby Atmos 7.2.4 in an 11x14 dedicated HT

I agree with Jeff. Sometimes less is more, and putting 10lbs of stuff in a 5lb bag just to say it's in there can sometimes be mostly for pride. I would also go with a single row and try to do 5.2.4. Rear surrounds (ala 7.1) should have at least 4-5' behind the LP and putting them there for the sake of having them just won't add anything and will be a distraction more than an immersion. Also by getting a single row of seats off the rear wall will give you better bass response and allow the atmos speakers to be placed properly. It also looks like with 2 rows, the front row will be in the center of the room, which will be a bass vacuum. The extra money not spent on second row seating and rear surrounds could be spent on sound treatment which would be money better spent imo. The mains being so close to the walls will need some help, and bass traps won't hurt either.


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post #5 of 31 Old 01-07-17, 11:28 AM Thread Starter
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Re: Dolby Atmos 7.2.4 in an 11x14 dedicated HT

Guys, I greatly appreciate and really value the feedback. I should add a few bits of information to clarify where I am in the process and what I am ok with changing.
• I have already ordered 7 theater seats and there is no changing that, plus I need the 7 seating positions.
• If the bass response in the front row sucks (as you have all agreed it will), I am actually ok with that since the front row will mostly be for kids
• I already have the screen and am very happy with the size
• I am open to changing the speakers to fit beneath the screen (screen is 36" off the floor)
• I am open to using more or less surround speakers and moving their placement
• I am adding a layer of QuietRock w/ Green Glue to all the walls, sound deadening panels on all the walls, sound insulation in the attic, solid door (not sure what to do with this yet), and deadening all the outlets

My original plan for this room was to move eliminate a wall and make a larger space, but this turned out to be nearly impossible for structural reasons.

Thanks again for your input and continued help with ideas.
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post #6 of 31 Old 01-07-17, 12:28 PM
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Re: Dolby Atmos 7.2.4 in an 11x14 dedicated HT

The front row will still sound better than the back row. The back row will have a really really hard time with dialog intelligibility and surround field. If the screen is returnable, I would get a smaller one and allow you to move both rows forward - front away from center length and rear away from the wall behind - then treat that wall with 6-8" thick panels with a limp membrane to minimize mid and high absorption and just concentrate on the lows and lower mids which will be what is causing the issues.

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post #7 of 31 Old 01-07-17, 12:53 PM
 
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Re: Dolby Atmos 7.2.4 in an 11x14 dedicated HT

If the screen is too big for your liking...just make some black panels to matt it...then in the future if you get a bigger room, you don't have to buy another screen.

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post #8 of 31 Old 01-07-17, 01:38 PM
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Re: Dolby Atmos 7.2.4 in an 11x14 dedicated HT

Yes I forgot to include the surround field being compromised in the back row up against the wall too. That would effect my decision probably more than questionable bass performance. I'm a believer in surround speaker performance just as much as the fronts for the best experience. I might cancel the other row of seats if not shipped yet and let the kids have beanbags or something. I'm possibly a bit more selfish though and for all the expense, I would focus on adult experience. Ron and Brian have given good advice also.


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post #9 of 31 Old 01-07-17, 05:28 PM
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Re: Dolby Atmos 7.2.4 in an 11x14 dedicated HT

just my 2 cents.... forget about green gluing your walls... just buy as much OC703 as you can afford and double that up on your walls...

http://www.buyinsulationproductstore...tic-board-4-3/

these are some of the best prices i have found and will make a huge difference in your bass response.

i plan to triple these up ... line the walls and hang some on the ceiling wrapped in black GOM fabric.
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post #10 of 31 Old 01-07-17, 05:30 PM
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Re: Dolby Atmos 7.2.4 in an 11x14 dedicated HT

i second the bean bags... i have a 12 by 18 room and im just doing one row and bean bags if people want them. i also am looking for a narrow reclining love seat for 2.
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