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post #1 of 38 Old 01-24-2020, 10:35 AM - Thread Starter
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Splayed Walls

Any benefit to splaying walls in a theater room? Is there a very specific calculation that needs to be done to obtain the angles based on room size, or would any angle be beneficial that eliminates parallel walls? Current space to work with is 24’ X 18’
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post #2 of 38 Old 01-24-2020, 03:40 PM - Thread Starter
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No opinions on splayed walls? I have a design, I'll upload it a bit later when I'm able.
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post #3 of 38 Old 01-24-2020, 08:39 PM
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I splayed my walls. Excellent defense against standing waves. And the esthetics are hard to beat.

Goodbye to a great audio and video genius and writer... JOHN GANNON. I enjoyed your friendship, wit and a nice long run we took around Indianapolis at CEDIA years back... and for buying my Runco 980 Ultra years back... you saved my ass! Rest in peace.
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post #4 of 38 Old 01-24-2020, 08:43 PM
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Quote:
Originally Posted by Blackdevil77 View Post
Any benefit to splaying walls in a theater room? Is there a very specific calculation that needs to be done to obtain the angles based on room size, or would any angle be beneficial that eliminates parallel walls? Current space to work with is 24’ X 18’
Fancier calculations can always be done, but any slight/reasonable angle off of a perfect parallel will benefit you in terms of standing waves by eliminating a 1-1 bounceback effect.

Have a look here: https://www.soundonsound.com/techniq...ol-room-design
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post #5 of 38 Old 01-25-2020, 09:50 AM - Thread Starter
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Thank you for the information! I have a design but I can't upload it, it's in the PDF format

*Nevermind, it uploaded!*
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File Type: pdf Theater Room No Dimensions-Model.pdf (10.9 KB, 35 views)
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post #6 of 38 Old 01-25-2020, 09:54 AM
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instead of one continuous splayed wall think about a stepped wall with accent lights at each step. Same on the ceiling. Erskine design

https://essentialinstall.com/case-st...d-at-cedia-hq/
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post #7 of 38 Old 01-25-2020, 09:56 AM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
instead of one continuous splayed wall think about a stepped wall with accent lights at each step. Same on the ceiling. Erskine design

https://essentialinstall.com/case-st...d-at-cedia-hq/
That looks excellent, I love those designs. With a slight adjustment, I should be able to convert this to stepped walls.
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post #8 of 38 Old 01-25-2020, 09:57 AM - Thread Starter
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Here's a snapshot for those that can't view the PDF
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post #9 of 38 Old 01-25-2020, 10:07 AM
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post #10 of 38 Old 01-25-2020, 10:09 AM
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Quote:
Originally Posted by Blackdevil77 View Post
That looks excellent, I love those designs. With a slight adjustment, I should be able to convert this to stepped walls.
If you follow the Erskine Group on Facebook there are other examples and construction photos.
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post #11 of 38 Old 01-25-2020, 10:49 AM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
If you follow the Erskine Group on Facebook there are other examples and construction photos.
Is there any functional benefit from doing stepped instead of splayed or is it purely aesthetic? The accent lighting looks great. I wouldn't be able to do the ceiling like this, it's too low as it is.
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post #12 of 38 Old 01-25-2020, 10:54 AM
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as far as I know it is aesthetic.
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post #13 of 38 Old 01-25-2020, 11:26 AM - Thread Starter
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My next question is, where would you put room treatments with this layout and what kind of treatments? I know where I’d put diffusion in the back, but is absorption at first reflection points still necessary with splayed walls?
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post #14 of 38 Old 01-25-2020, 11:36 AM
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Yes, but it's complicated as even with straight walls and contrary to public opinion you don't want too much absorption at the first reflection point
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post #15 of 38 Old 01-25-2020, 01:04 PM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
Yes, but it's complicated as even with straight walls and contrary to public opinion you don't want too much absorption at the first reflection point
Yeah that much I know, I don’t want to absorb everything and have the room sound totally dead. How should I approach figuring out how to treat this? I’d like to integrate the treatments into the construction.
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post #16 of 38 Old 01-25-2020, 01:16 PM
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if you are DIYing figure out what you would do if it was a perfect rectangle, than using geometry figure out where the relocated reflection points are in your design and move things to those locations.
Or hire someone like Erskine, Acoustic Frontiers, or Quest Acoustical Interiors for a plan
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post #17 of 38 Old 01-26-2020, 05:23 AM
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Splayed walls might be aesthetic. Unless you are familiar with a room and it's construction, you might find yourself looking at a room that is
rectangular with acoustically transparent fabric walls. An example of that would be Dennis Erskine's St Kitts theater. The surrounds are hidden
behind the splayed fabric walls.

The other argument I have heard, is a rectangular room is simpler to model, and a splayed room or room with lots of soffits, and niches or angled walls
is very complex to model. Not that most people model a space, but rectangular is perhaps just simpler for a DIY'er to follow a few rules.

What is the driving force behind you considering splayed walls? I personally like the look and the ability to hide surround speakers, host conduit
runs, and it's an inexpensive way to add some design flair. They also might be a way to visually eliminate too much space around a screen up front.
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post #18 of 38 Old 01-26-2020, 06:01 AM
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Here’s a photo of my splayed walls before fabric is applied and after finished. Dennis designed my theater. If you can do it. You get the great acoustical benefits and esthetics.


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Goodbye to a great audio and video genius and writer... JOHN GANNON. I enjoyed your friendship, wit and a nice long run we took around Indianapolis at CEDIA years back... and for buying my Runco 980 Ultra years back... you saved my ass! Rest in peace.
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post #19 of 38 Old 01-26-2020, 07:44 AM - Thread Starter
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Quote:
Originally Posted by Tedd View Post
Splayed walls might be aesthetic. Unless you are familiar with a room and it's construction, you might find yourself looking at a room that is
rectangular with acoustically transparent fabric walls. An example of that would be Dennis Erskine's St Kitts theater. The surrounds are hidden
behind the splayed fabric walls.

The other argument I have heard, is a rectangular room is simpler to model, and a splayed room or room with lots of soffits, and niches or angled walls
is very complex to model. Not that most people model a space, but rectangular is perhaps just simpler for a DIY'er to follow a few rules.

What is the driving force behind you considering splayed walls? I personally like the look and the ability to hide surround speakers, host conduit
runs, and it's an inexpensive way to add some design flair. They also might be a way to visually eliminate too much space around a screen up front.
Quote:
Originally Posted by thebland View Post
Here’s a photo of my splayed walls before fabric is applied and after finished. Dennis designed my theater. If you can do it. You get the great acoustical benefits and esthetics.


The driving force is the acoustical benefits first and foremost, as well as the aesthetics. Makes the room much more interesting than being in a box. If I get a pro to do the framing, I can do everything else. All that intricacy with the framing would drive me insane.
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post #20 of 38 Old 01-26-2020, 08:13 AM
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Quote:
Originally Posted by thebland View Post
Here’s a photo of my splayed walls before fabric is applied and after finished. Dennis designed my theater. If you can do it. You get the great acoustical benefits and esthetics.







Just out of curiosity, that appears to be 1 inch thick treatments, is that correct? Are you happy with the acoustics? I ask because I am back and forth between 1 and 2 inch, but would like to save as much space as possible.


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post #21 of 38 Old 01-26-2020, 08:16 AM
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Honestly, I’ve never heard a better room. But there are so many factors that have contributed to this. Speakers, splay walls, lay out and design, etc. it’s what was spec’d and it worked out well. If you were near Detroit, I could demo it.

Goodbye to a great audio and video genius and writer... JOHN GANNON. I enjoyed your friendship, wit and a nice long run we took around Indianapolis at CEDIA years back... and for buying my Runco 980 Ultra years back... you saved my ass! Rest in peace.
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post #22 of 38 Old 01-26-2020, 08:30 AM
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The ceiling is 2” and 1”.

Goodbye to a great audio and video genius and writer... JOHN GANNON. I enjoyed your friendship, wit and a nice long run we took around Indianapolis at CEDIA years back... and for buying my Runco 980 Ultra years back... you saved my ass! Rest in peace.
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post #23 of 38 Old 01-27-2020, 11:44 AM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
as far as I know it is aesthetic.
Could I do something like this to get the appearance of the theater you posted? I could do actual stepped walls, but the front of the room would have to be more narrow than it currently is in the first design to fit in the space if I keep the same 6 degree angles of the side walls. Those add ons on the walls could be a simple frame with fabric on it.
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post #24 of 38 Old 01-27-2020, 12:49 PM
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probably, I think the splays are all about the light accents, it you don't do that I wouldn't bother.
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post #25 of 38 Old 01-27-2020, 01:04 PM - Thread Starter
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probably, I think the splays are all about the light accents, it you don't do that I wouldn't bother.
There’s no acoustical benefit to splayed walls? I was under the impression non parallel walls were a good thing in audio world. Either way, I do want to do the lighting, I love the look.
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post #26 of 38 Old 01-27-2020, 01:42 PM
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I was referring to the wall with the breaks not your original continuous splayed wall design
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post #27 of 38 Old 01-27-2020, 01:43 PM - Thread Starter
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Quote:
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I was referring to the wall with the breaks not your original continuous splayed wall design
Oh okay, gotcha. So I’ll probably do something like the last design I posted for the lighting. I like the look
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post #28 of 38 Old 01-27-2020, 05:31 PM
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I look at splayed walls as somewhat easy to do, as it can be rather sectional and manageable, size-wise. The lighting can be rather dramatic with inexpensive
LED tape lighting and aluminum extrusions, as Jeff mentions, to create a style of theater that isn't the typical North American look.

Splayed walls are about avoiding nodes and offering up potentially smoother audio. thebland's room is far more then splayed walls. The ceiling
is acoustically treated as are the walls, but those treatments are something a rectangular room with fabric panel walls can have.

Here's a few more splayed wall rooms. The IMAX is likely as complex as Jeff's and the other pair, I doubt have much in acoustical treatments.
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post #29 of 38 Old 01-27-2020, 06:28 PM
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I think it is a tactical error to mount the segmented spayed walls such that the light accents shine directly on the screen. But it is also a challenge to come up with a plan so that you can't see the LED strips themselves just a some glowing light. You need to create a lip on the panels and hide the strips out of sight behind the lip.


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post #30 of 38 Old 01-27-2020, 07:17 PM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
I think it is a tactical error to mount the segmented spayed walls such that the light accents shine directly on the screen. But it is also a challenge to come up with a plan so that you can't see the LED strips themselves just a some glowing light. You need to create a lip on the panels and hide the strips out of sight behind the lip.


Yeah I thought of that as well. That’s what this little pocket is for in the design I made. Not sure if it’ll work in practice as I picture it in my head, but I can’t imagine why not.
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