CHANNELS  |  ROOM VOLUME  |  EAR LEVEL  |  CEILING MONITORS  |  SUBWOOFERS  |  CALIBRATE MY SETUP


DOLBY ATMOS® AUDIO FORMAT

Dolby Atmos® is an audio format that allows you to be totally immersed when listening to music, watching a movie, or playing video games.
Unlike other multichannel formats, it considers the verticality of the sound. We therefore have an additional listening axis that allows us to have
a sound scene in three dimensions. Focal has been adapting its products to fit in the (ISO) 2969 and SMPTE 202 standards on which the various
Dolby Atmos® formats are based. Inserts have also been added to the Alpha Evo (50,65 and 80) and
new Solo6 ST6 for ceiling mounting, in addition to the entire Shape series.

schéma

schéma

7.1.4 is the minimum preferred Dolby Atmos® layout.
Each number separated by a dot corresponds to a specific height.

A. Monitors at ear level this is 1.2m on average.

B. Subwoofers, ideally placed on the floor.

C. Overhead monitors.

Note: It is, however, possible to add additional audio sources to achieve a 17.X.10 format
(see Dolby Atmos Home Entertainment Studio technical guidelines).

CHANNEL DESIGNATIONS


HOW LARGE SHOULD THE ROOM BE?

CTA

CTA

A Dolby Atmos installation requires a minimum room volume of 50m³.
For an optimal setup, the area that contains the monitors should meet
the following requirements:

A. HEIGHT ≥ 2.4M
B. WIDTH ≥ 3M
C. DEPTH ≥ 3.5M
D. DISTANCE BETWEEN THE MONITORS AND THE MIXING POSITION

< 4M OPTIMAL 
< 5M MAX.

Note: These layout dimensions are independent of your room volume.


HOW TO PLACE EAR LEVEL MONITORS?

There are two types of layouts:

the equidistant layout and the orthogonal layout.
The choice is mainly based on the space you have available and where your mix position is located.

An orthogonal layout will favor a set back sweet spot as well as a control room with significant
depth, whereas an equidistant layout will be more suitable for large rooms and is not subject
to time alignment issues between channels.

The center, left, right and surround monitors constitute the first height to be considered for your
setup. The other channels are distributed from angle 0, determined by the center monitor.

The angles of the surround channels depend on the chosen layout.

The acoustic center of each monitor (point where the sound seems to arrive from the speaker)
should be 1.2m high.

Note: In an equidistant layout, this distance is the same for all the monitors in your setup.

OPTIMAL EQUIDISTANT LAYOUT

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OPTIMAL orthogonal LAYOUT

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HOW TO PLACE ceiling MONITORS?

The horizontal positioning

The horizontal positioning

The horizontal positioning of the Top monitors (Ltf, Rtf, Ltr, Rtr) is
done in the same way as the monitors at ear level (L, C, R and Surrounds).
They surround the mix position which is also the center of the top speaker array.
Their acoustic center (point where the sound seems to arrive from the speaker)
must be at least 2.4m high and oriented to the mix position at a vertical angle of 45°.

Note: This angle is applicable for Front and surround monitors at ear level with no vertical tilt.
We strongly recommend to keep the setup this way.

However, If the front and surround monitors are higher than ear level with a vertical tilt,
please refer to the Dolby Atmos Home Entertainment Studio technical guidelines chapter 2.3.4.

SIDE VIEW EQUIDISTANT & ORTHOGONAL LAYOUT
FRONT VIEW EQUIDISTANT & ORTHOGONAL LAYOUT

OPTIMAL EQUIDISTANT LAYOUT

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OPTIMAL orhtogonal LAYOUT

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Design
Design

HOW TO PLACE SUBWOOFERS?

The subwoofer should be ideally placed on the floor to improve the frequency response inlow end.
It is also possible to chain and stack several subwoofers for more output level.

 


HOW DO I CALIBRATE MY SETUP?

The sound level of your setup should be between 79dB(C) and 85dB(C). Once you have chosen your level, each monitor should be
measured from the mix position with a measurement microphone or a sonometer.
Use the Dolby pink noise to adjust the level of each channel individually.
All monitors should have the same level. However, it is possible to adjust your subwoofer by up to 10dB.
To manage your monitor level, delay, and tuning you will need a dedicated audio interface.
Some of these offer auto calibrations using a measurement microphone.
Otherwise, most of them allow you to apply level corrections, filtering, and delays.
Make sure that the number of outputs corresponds to your Dolby Atmos® setup.

 

ALPHA EVO LAYOUT

 

shape LAYOUT

 

ST6 LAYOUT

 

sM6 LAYOUT

 

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