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Dolby Atmos 5.1.4 overhead speaker location


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Hi all

 

I am installing 4 x Krix Atmospherix AS in-ceiling speakers tomorrow 

 

These are the speakers: https://bit.ly/2S8HqVx 

 

Trying to pinpoint the best ceiling location for each based on my room dimensions.

 

Is it best to follow the Colby pic below and line up the overhead speakers with the L & R front speakers?

 

Room depth from screen to rear wall is 5.56M. Room height I would guess 2.3/2.5m.

 

Based on my room size and with reference to the below Dolby 5.1.4 installation picture as a guide, what distance is recommended for installation of the L & R (mid & rear) in-ceiling speakers?

 

Don't want to get this wrong!

 

Thanks in advance.

Dolby Atmos 5.1.4.JPG

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Hi @agrif78,

Yes, line them up with left and right fronts. The overhead (side view) placement is more specific to your main seating position.

If you have a look on page 20 here: https://www.dolby.com/us/en/technologies/dolby-atmos/dolby-atmos-home-theater-installation-guidelines.pdf , you'll see in the bottom right corner that they should be between 30-55 degrees from front and 125-150 degrees at the rear.

If you can let me know your ceiling height and how far you sit from the front wall, I can work out the rough measurements for you.

Cheers,

 

Michael

Edited by Krix Loudspeakers
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In the real world you'll probably find you need to make some adjustment in positioning to avoid cutting roof trusses, power cables etc. Take your time to suss things out in your roof space and work out if you'll need to make some compromises with positioning - I certainly did in my 7.2.4 installation.

 

Good to see you're using ceiling speakers with backboxes - I used the Atmospherix AS as well and have been happy with them. If you're planning to spray the grilles black, the Krix badge will lift off with a thumbnail if you use a bit of care.

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Just now, agrif78 said:

@Krix Loudspeakers Thanks Michael, that would be amazing. 

 

I will send the ceiling height and how far I sit from the front wall as soon as I get home from work around 6PM. 

 

My installer will be at my place at 7AM tomorrow so hope that you offer after hours assistance :)

That should be ok :) . Like Quark has mentioned, you may run into trusses or other obstacles, so I'll just work out the range and you can get within that as much as possible. Dolby recommend using the same angle at the front as the back, so if you bring the front speakers closer to the couch then it's suggested you also bring the rear speakers closer by the same distance.

I'll keep an eye out for the email.
Cheers,
Michael

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@Krix Loudspeakers 

 

Hi Michael

 

Sorry for late reply.

 

Ceiling height is 2.42M.

 

Seating from screen wall is 3.75M at present but may move seating back to maybe 4M when PJ is mounted tomorrow.

 

And ... How much width should there be between the surround speakers and the rear overhead speakers? My rear surround right, being in line with front right will be pretty close to rear overhead, so should I consider moving screen and front right to the left a bit to create a bit more separation for rear surround right and rear overhead?

 

Cheers

Edited by agrif78
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Hi @agrif78,

No worries. If you are looking to sit at 3.75m  then the distances for the angles look like:

45 degrees = 2330mm from front wall to front overheads, 5170mm from front wall to rear overheads (390mm to back wall)
50 degrees = 2560mm from front wall to front overheads, 4940mm from front wall to rear overheads (620mm to back wall)

55 degrees = 2755mm from front wall to front overheads, 4745mm from front wall to rear overheads (815mm to back wall)

 

If you move your main listening position 250mm back then add 250mm to each of those measurements (-250mm for distance to rear wall). Keep in mind that if you go for 45 degrees and move back 250mm to 4m, that means you will only have 140mm from rear overheads to the rear wall, which won't be enough as this is about the radius of the speaker. In that case, I'd be aiming more towards the 55 degree measurements. Personally, I like the overheads being closer to me anyway.

There's not a specific measurement that the speakers should be separated by, it's more recommendations on speaker heights and angles. Your rear surrounds should technically be no more than about 1.3m high (if your fronts are about 1m tall). If you were to go with the 55 degree options, then this would place the rear overhead and rear surround at about 1400mm apart and provide adequate separation.

 

I'm not sure I'm following 100% with moving the screen and front right speaker to the left to assist with rear surround and rear right overhead separation... probably not a compromise I'd be willing to make.

Hope this helps!
Cheers,
Michael

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55 minutes ago, agrif78 said:

@Krix Loudspeakers 

 

Hi Michael

 

Sorry for late reply.

 

Ceiling height is 2.42M.

 

Seating from screen wall is 3.75M at present but may move seating back to maybe 4M when PJ is mounted tomorrow.

 

And ... How much width should there be between the surround speakers and the rear overhead speakers? My rear surround right, being in line with front right will be pretty close to rear overhead, so should I consider moving screen and front right to the left a bit to create a bit more separation for rear surround right and rear overhead?

 

Cheers

Sorry I've just re-read this keeping in mind that we are talking about a 5.1.4 setup. In a 5.1.4 setup there are no rear surrounds, only side surrounds. These should be placed at around 110-120 as per the diagram.

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@Krix Loudspeakers 

 

@Quark My question was actually how far apart (in distance not degrees) should speakers no. 5 & 7 be? (as per diagram in my opening post).

 

My 5 & 7 on rear right hand side will practically be rubbing up against one another (distance wise). Is that a problem?

 

(Speaker 5 are set of Krix Equinox on 900mm stands) I cannot move 5 any further right as it is right up against the side wall.

Edited by agrif78
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7 hours ago, agrif78 said:

@Krix Loudspeakers 

 

@Quark My question was actually how far apart (in distance not degrees) should speakers no. 5 & 7 be? (as per diagram in my opening post).

 

My 5 & 7 on rear right hand side will practically be rubbing up against one another (distance wise). Is that a problem?

 

(Speaker 5 are set of Krix Equinox on 900mm stands) I cannot move 5 any further right as it is right up against the side wall.

Your surrounds should ideally be down to a point where they're just above your seated ear height and have good distance separation from your in-ceiling speakers. It's not about them being a different distance from your listening position, but a (substantially) different angle. Your ears tend to be less effective at sensing direction from behind. If your speakers are nearly rubbing against each other there's not enough separation.

 

In my room (4.3m x 5.3m) I've had to mount my surrounds higher than ideal, but the rear surrounds are about .9m from the rear in-ceiling (center to center) and about 1.5m from the side surrounds.

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Hi @agrif78,

 

I hope the install is going well. Just to clarify, you mention the Equinox (speaker 5) are on 900mm stands (on floor), and the Atmospherix AS (speaker 7) will be in ceiling.

Can I ask how they are so close as to be rubbing against each other?

Perhaps a picture may help.

 

Thanks,

Michael

 

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@Quark @Krix Loudspeakers Install is going well. Overhead speaker holes cut and ceiling cables will be laid tomorrow and PJ ceiling mounted. 

 

Just a question - in relation to below picture, what orientation should the Atmospherix AS be when inserted into the roof holes?

 

On further reflection, I think there will now be more than adequate separation between the rear right surround & overhead speakers. 

 

Will take a photo and post late tonight - probably around 10PM when I get home from a work function.

IMG_20190219_092734.jpg

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2 minutes ago, agrif78 said:

@Quark @Krix Loudspeakers Install is going well. Overhead speaker holes cut and ceiling cables will be laid tomorrow and PJ ceiling mounted. 

 

Just a question - in relation to below picture, what orientation should the Atmospherix AS be when inserted into the roof holes?

 

On further reflection, I think there will now be more than adequate separation between the rear right surround & overhead speakers. 

 

Will take a photo and post late tonight - probably around 10PM when I get home from a work function.

 

 

Not sure if I did the correct orientation technically, but to maximise perceived separation from my surrounds I installed with the tweeters closest to the seating position.

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The Atmospherix AS have quite a wide dispersion pattern, and with the two drivers so close together you would probably struggle to pick the difference between orientations... however if you wanted to be specific, then having the tweeter closest to seating position (as @Quark has done) would be the recommendation. Again, it's only a minuscule difference :) 

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  • 3 weeks later...

@Quark Is it possible to bi amp my front Krix floor standing Harmonix speakers using ANY spare channel on my Pioneer lx901 receiver ? (The pioneer manual seems to suggest I need to specifically use one of the height speaker channels to bi amp front speakers in my 5.1.4 configuration) 

 

As I now have 4 ceiling speakers using both height 1 & 2 channels of the receiver for 5.1.4, I was wondering if I can use the unused "rear surround" channel on the Pioneer receiver to bi amp the front speakers?

 

Cheers 

Edited by agrif78
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12 minutes ago, agrif78 said:

@Quark Is it possible to bi amp my front Krix floor standing Harmonix speakers using ANY spare channel on my Pioneer lx901 receiver ? (The pioneer manual seems to suggest I need to specifically use one of the height speaker channels to bi amp front speakers in my 5.1.5 configuration) 

 

As I now have 4 ceiling speakers using both height 1 & 2 channels for 5.1.4, I was wondering if I can use the unused "rear surround" channel on the Pioneer receiver to bi amp the front speakers?

 

Cheers 

I'm not familiar with the lx901 but doubt you'll be able reassign channels other than what's on offer. Can you assign your overhead speakers to other channels to free up the height channels?

 

If you do try, be aware, that some AVRs have lower powered height and surround channels, so if you do try, use the height channels to power the mids/tweeters (should be the highest two connectors on the speakers) as woofers use a lot more power. Also, just in case you're not aware, it's essential you remove the jumper strips that connect the woofers to the mids/highs before bi-amping.

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Thanks for the fast reply, I will have look into my options. The manual definitely says a no go in 5.1.4 but will see if I can do as you say.

 

With the jumper strips, I had the speakers bi amped before I got the ceiling speakers and don't know where the jumper strips have gone.

 

If I can't bi amp in 5.1.4, is it essential/recommended to pick up some new jumper strips and install back to the fronts?

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