Atmos speaker placement question - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 2Likes
  • 1 Post By J_P_A
  • 1 Post By Jish9
 
Thread Tools
post #1 of 16 Old 07-15-2017, 08:32 AM - Thread Starter
Advanced Member
 
mpjmeyer's Avatar
 
Join Date: Jan 2013
Location: St. Louis, MO
Posts: 703
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 300 Post(s)
Liked: 253
Atmos speaker placement question

I recently mounted my atmos speakers and want to make sure they are located in a good spot before proceeding to the next step. Ceilings are 90" tall, speakers are 4' apart from each other side to side and 2' in front of each row of seats.
Attached Thumbnails
Click image for larger version

Name:	IMG_1757.jpg
Views:	115
Size:	121.9 KB
ID:	2237905  

It may not be your job, but perhaps it's your opportunity.

MPJ's theater build: https://www.avsforum.com/forum/19-ded...ter-build.html

Last edited by mpjmeyer; 07-15-2017 at 10:34 AM.
mpjmeyer is offline  
Sponsored Links
Advertisement
 
post #2 of 16 Old 07-15-2017, 09:47 AM
AVS Forum Special Member
 
J_P_A's Avatar
 
Join Date: Dec 2008
Location: L.A. - Lower Alabama
Posts: 5,182
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 765 Post(s)
Liked: 577
A layout of your room with your base layer and overheads shown would probably be helpful to make sure there's nothing odd going on. From your post, it's not clear if you have a single row of seats or multiple rows.

The ATMOS guideline is to put a single row of overheads at about 80 degrees (about 10 degrees in front of the listener). Assuming a seated ear height of 36", that's 54" from your ears to the ceiling. That would put the overheads about 10" in front of the listeners ears. Mounting them at 2' in front of the listeners ears puts them at one end of the recommended range, but I don't see a problem with that.

If you have two rows and are planning for two rows of top speakers, then I think things will change.

The Dolby recommendation is also to mount the overheads in line with the L and R speakers up front.

Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2017-07-15 at 11.39.06 AM.jpg
Views:	355
Size:	77.4 KB
ID:	2237833  

Dude, are you made of leprechauns? Cause that was awesome!
The Plains Theater Has Begun
Pro Designed Room - Measurements Before/During/After Treatments.
J_P_A is offline  
post #3 of 16 Old 07-15-2017, 09:58 AM - Thread Starter
Advanced Member
 
mpjmeyer's Avatar
 
Join Date: Jan 2013
Location: St. Louis, MO
Posts: 703
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 300 Post(s)
Liked: 253
Sorry. Yes I have 2 rows of seats, each row of atmos speakers is 2' in front of each row. I could put a pic of the layout but not sure how with the photobucket issue

It may not be your job, but perhaps it's your opportunity.

MPJ's theater build: https://www.avsforum.com/forum/19-ded...ter-build.html
mpjmeyer is offline  
Sponsored Links
Advertisement
 
post #4 of 16 Old 07-15-2017, 10:08 AM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 32,150
Mentioned: 436 Post(s)
Tagged: 5 Thread(s)
Quoted: 5848 Post(s)
Liked: 5419
go the the edit post, click the icon for paper clip, select your photo file, then select upload, save edit, it will show up as a thumbnail. Your Atmos ceiling speaker placement sounds way off.
BIGmouthinDC is offline  
post #5 of 16 Old 07-15-2017, 10:23 AM
AVS Forum Special Member
 
J_P_A's Avatar
 
Join Date: Dec 2008
Location: L.A. - Lower Alabama
Posts: 5,182
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 765 Post(s)
Liked: 577
BIG is correct (as if there was any question). With four overhead speakers, your placement does not sound right. You'll need to decide if you're optimizing for one row or want to provide coverage for both.
BIGmouthinDC likes this.

Dude, are you made of leprechauns? Cause that was awesome!
The Plains Theater Has Begun
Pro Designed Room - Measurements Before/During/After Treatments.
J_P_A is offline  
post #6 of 16 Old 07-15-2017, 10:35 AM - Thread Starter
Advanced Member
 
mpjmeyer's Avatar
 
Join Date: Jan 2013
Location: St. Louis, MO
Posts: 703
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 300 Post(s)
Liked: 253
I was able to upload a file. I can arrange the speakers tomorrow where they are another 16" further in front of the seats if that helps. Also, are they spaced far enough apart?
Attached Thumbnails
Click image for larger version

Name:	IMG_1757.jpg
Views:	91
Size:	121.9 KB
ID:	2237913   Click image for larger version

Name:	IMG_1769.jpg
Views:	100
Size:	188.0 KB
ID:	2237921  

It may not be your job, but perhaps it's your opportunity.

MPJ's theater build: https://www.avsforum.com/forum/19-ded...ter-build.html

Last edited by mpjmeyer; 07-15-2017 at 10:39 AM.
mpjmeyer is offline  
post #7 of 16 Old 07-15-2017, 10:47 AM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 32,150
Mentioned: 436 Post(s)
Tagged: 5 Thread(s)
Quoted: 5848 Post(s)
Liked: 5419
Double the space between speakers in each row and I'd say they are about right for the first row, The speakers should be well outside the dimensions of the chairs. With that layout you will never be able to optimize the ceiling sound for both rows.

Also your head position in the first row looks like it will be 1/2 the room length which means there will giant holes in your bass frequency in those seats.

Last edited by BIGmouthinDC; 07-15-2017 at 10:51 AM.
BIGmouthinDC is offline  
post #8 of 16 Old 07-15-2017, 11:02 AM - Thread Starter
Advanced Member
 
mpjmeyer's Avatar
 
Join Date: Jan 2013
Location: St. Louis, MO
Posts: 703
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 300 Post(s)
Liked: 253
What about for the rear row? Right now, the speakers are 4' apart from the center of each. Will spacing each of them 6" apart help making them 5' apart? And the distance in front of each row is good??

It may not be your job, but perhaps it's your opportunity.

MPJ's theater build: https://www.avsforum.com/forum/19-ded...ter-build.html
mpjmeyer is offline  
post #9 of 16 Old 07-15-2017, 11:04 AM - Thread Starter
Advanced Member
 
mpjmeyer's Avatar
 
Join Date: Jan 2013
Location: St. Louis, MO
Posts: 703
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 300 Post(s)
Liked: 253
I'm debating on having both subs on the stage or 1 on the stage and 1 next to the rear row of seats, opposite side of room the stage sub will be on. I'm wiring the room for both options with subwoofer cables.

It may not be your job, but perhaps it's your opportunity.

MPJ's theater build: https://www.avsforum.com/forum/19-ded...ter-build.html
mpjmeyer is offline  
post #10 of 16 Old 07-15-2017, 01:00 PM - Thread Starter
Advanced Member
 
mpjmeyer's Avatar
 
Join Date: Jan 2013
Location: St. Louis, MO
Posts: 703
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 300 Post(s)
Liked: 253
I have the ability to move each speaker about 1' further in front of each row of seats and space them further apart. Thoughts?

It may not be your job, but perhaps it's your opportunity.

MPJ's theater build: https://www.avsforum.com/forum/19-ded...ter-build.html
mpjmeyer is offline  
post #11 of 16 Old 07-15-2017, 02:06 PM
AVS Forum Special Member
 
J_P_A's Avatar
 
Join Date: Dec 2008
Location: L.A. - Lower Alabama
Posts: 5,182
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 765 Post(s)
Liked: 577
If you're wanting to optimize the front row, then you need the speakers about 54" in front and 54" behind (that should be about 45 degrees). If you're wanting the 2nd row to have a similar experience then you need to move two of the ATMOS speakers behind the second row. Though it looks like you don't have much space.

The idea is to have ATMOS speakers both in front and behind you. If you have a processor capable of more than four ceiling speakers then you would want a row in front, a row between, and a row behind. Just trying to provide even coverage across the top of the room. You haven't said that's the case, so I assume you're stuck with four.

What's the head to head distance between your front and second row?


How far apart are your L/R speakers? As I mentioned before, that's where you need to start for your width spacing. They look too close together in your drawing to me.

Dude, are you made of leprechauns? Cause that was awesome!
The Plains Theater Has Begun
Pro Designed Room - Measurements Before/During/After Treatments.
J_P_A is offline  
post #12 of 16 Old 07-15-2017, 02:36 PM
AVS Forum Special Member
 
J_P_A's Avatar
 
Join Date: Dec 2008
Location: L.A. - Lower Alabama
Posts: 5,182
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 765 Post(s)
Liked: 577
I would put the front row of speakers at 45 degrees in front of the front row, and try to get the 2nd row of speakers within the spec for both the front and second row. Basically split the rows as long as that is within the Dolby spec. That's what I'm currently planning to do in my room, anyway. For my room that's 45 degrees in front of the front row, and the second row of speakers is 36 degrees behind the front row and 36 degrees in front of the second row (halfway between the two rows).

The alternative would be to put the front row at 45 degrees in front of the front row of seats and then put the 2nd row of speakers as close to 45 degrees behind the first row of seats as possible without putting them directly above the second row. I'd try not to go past 80 degrees for the second row.

Dude, are you made of leprechauns? Cause that was awesome!
The Plains Theater Has Begun
Pro Designed Room - Measurements Before/During/After Treatments.
J_P_A is offline  
post #13 of 16 Old 07-16-2017, 08:58 AM
AVS Forum Special Member
 
J_P_A's Avatar
 
Join Date: Dec 2008
Location: L.A. - Lower Alabama
Posts: 5,182
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 765 Post(s)
Liked: 577
Here's the four ATMOS speaker placement recommendations from Dolby.



Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2017-07-15 at 11.31.02 AM.jpg
Views:	287
Size:	84.9 KB
ID:	2239513   Click image for larger version

Name:	Screen Shot 2017-07-16 at 10.59.18 AM.jpg
Views:	294
Size:	88.3 KB
ID:	2239521  

Dude, are you made of leprechauns? Cause that was awesome!
The Plains Theater Has Begun
Pro Designed Room - Measurements Before/During/After Treatments.
J_P_A is offline  
post #14 of 16 Old 07-16-2017, 10:06 AM - Thread Starter
Advanced Member
 
mpjmeyer's Avatar
 
Join Date: Jan 2013
Location: St. Louis, MO
Posts: 703
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 300 Post(s)
Liked: 253
Speakers are now spaced 6' apart and 3 1/2' in front of each row of seats instead of 2'.
Attached Thumbnails
Click image for larger version

Name:	IMG_1777.jpg
Views:	43
Size:	214.9 KB
ID:	2239649  

It may not be your job, but perhaps it's your opportunity.

MPJ's theater build: https://www.avsforum.com/forum/19-ded...ter-build.html
mpjmeyer is offline  
post #15 of 16 Old 07-17-2017, 03:31 PM
Senior Member
 
Jish9's Avatar
 
Join Date: Apr 2014
Posts: 355
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 293 Post(s)
Liked: 111
Quote:
Originally Posted by mpjmeyer View Post
Speakers are now spaced 6' apart and 3 1/2' in front of each row of seats instead of 2'.
I think you may be missing the point here. We are talking about the distance in front of and behind each row and not just the horizontal distance between the speakers. What would make sense is saying that the speakers are 7' apart front to back placing them 3 1/2' in front of and behind each row.
J_P_A likes this.
Jish9 is offline  
post #16 of 16 Old 07-17-2017, 05:57 PM
AVS Forum Special Member
 
J_P_A's Avatar
 
Join Date: Dec 2008
Location: L.A. - Lower Alabama
Posts: 5,182
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 765 Post(s)
Liked: 577
Quote:
Originally Posted by Jish9 View Post
I think you may be missing the point here. We are talking about the distance in front of and behind each row and not just the horizontal distance between the speakers. What would make sense is saying that the speakers are 7' apart front to back placing them 3 1/2' in front of and behind each row.
I was beginning to wonder if it was just me

Dude, are you made of leprechauns? Cause that was awesome!
The Plains Theater Has Begun
Pro Designed Room - Measurements Before/During/After Treatments.
J_P_A is offline  
Sponsored Links
Advertisement
 
Reply Dedicated Theater Design & Construction

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off