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-   -   Atmos speaker placement question (https://www.avsforum.com/forum/19-dedicated-theater-design-construction/2897601-atmos-speaker-placement-question.html)

mpjmeyer 07-15-2017 09:32 AM

Atmos speaker placement question
 
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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.

J_P_A 07-15-2017 10:47 AM

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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.

https://www.avsforum.com/forum/attach...1&d=1500137143

mpjmeyer 07-15-2017 10:58 AM

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

BIGmouthinDC 07-15-2017 11:08 AM

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.

J_P_A 07-15-2017 11:23 AM

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.

mpjmeyer 07-15-2017 11:35 AM

2 Attachment(s)
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?

BIGmouthinDC 07-15-2017 11:47 AM

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.

mpjmeyer 07-15-2017 12:02 PM

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??

mpjmeyer 07-15-2017 12:04 PM

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.

mpjmeyer 07-15-2017 02:00 PM

I have the ability to move each speaker about 1' further in front of each row of seats and space them further apart. Thoughts?

J_P_A 07-15-2017 03:06 PM

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.

J_P_A 07-15-2017 03:36 PM

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.

J_P_A 07-16-2017 09:58 AM

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mpjmeyer 07-16-2017 11:06 AM

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Speakers are now spaced 6' apart and 3 1/2' in front of each row of seats instead of 2'.

Jish9 07-17-2017 04:31 PM

Quote:

Originally Posted by mpjmeyer (Post 54318001)
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 07-17-2017 06:57 PM

Quote:

Originally Posted by Jish9 (Post 54347001)
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 :D


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