Dolby Atmos Speaker Placement Calculator
Enter your layout, room and seat. See where each Dolby Atmos speaker goes, its angle window, its height, and whether it passes, for 5.1 to 9.1.6.
7.1.4 in a 5.5 by 7.5 by 2.8 m room, seated 3.6 m from the screen wall: all 11 speakers have a position inside their Dolby window: top fronts 1.9 m from the screen wall, top rears 5.3 m. Top front to top rear are 90 degrees apart, over the RP22 limit of 80.
Calculating for your numbers…
One seat in a rectangular room, screen on the front wall. Rows, more seats and other room shapes are in Cinema Designer.
Where each speaker goes
Dolby nominal: each speaker at the centre of its Dolby window. The RP22 variant moves the top speakers to close the upper-row gap, to 79 degrees (1 degree inside the 80 degree limit).
| Speaker | Target azimuth | Target elevation | Suggested position | Passing range | Verdict |
|---|---|---|---|---|---|
| Left and right frontL / R | 22–30° | Ear height, 1.1 m | Lx 1.15, y 0.1, z 1.1 mRx 4.35, y 0.1, z 1.1 m | LAny point from x 0.76 to 1.29 m on the front wallRAny point from x 4.21 to 4.74 m on the front wall | In window azimuth 24.6° |
| CentreC | 0–5° | Ear height, 1.1 m | x 2.75, y 0.1, z 1.1 m | Any point from x 2.48 to 3.02 m on the front wall | In window azimuth 0.0° |
| Left and right surroundLs / Rs | 90–110° | Ear height, 1.1 m | Lsx 0.1, y 4, z 1.1 mRsx 5.4, y 4, z 1.1 m | LsAny point from y 3.66 to 4.48 m on the left wallRsAny point from y 3.66 to 4.48 m on the right wall | In window azimuth 98.6° |
| Left and right rear surroundLrs / Rrs | 135–150° | Ear height, 1.1 m | Lrsx 0.3, y 7.4, z 1.1 mRrsx 5.2, y 7.4, z 1.1 m | LrsAny point from x 0.1 to 0.5 m on the back wallRrsAny point from x 5 to 5.4 m on the back wall | In window azimuth 147.2° |
| Left and right top frontLtf / Rtf | 30–45°off the centre line | 30–55°side view | Ltfx 1.45, y 1.9 m, on the ceiling at 2.8 mRtfx 4.05, y 1.9 m, on the ceiling at 2.8 m | LtfOn the ceiling (2.8 m), x 1.16 to 1.69 m, y 0.83 to 2.29 mRtfOn the ceiling (2.8 m), x 3.81 to 4.34 m, y 0.83 to 2.29 m | In window off the centre line 37.5°, side view 45.0° |
| Left and right top rearLtr / Rtr | 30–45°off the centre line | 125–150°side view | Ltrx 1.45, y 5.3 m, on the ceiling at 2.8 mRtrx 4.05, y 5.3 m, on the ceiling at 2.8 m | LtrOn the ceiling (2.8 m), x 1.16 to 1.69 m, y 4.84 to 6.49 mRtrOn the ceiling (2.8 m), x 3.81 to 4.34 m, y 4.84 to 6.49 m | In window off the centre line 37.5°, side view 135.0° |
| SubwooferLFE | Not placed here: a subwoofer is judged on bass response, not on angles. Try the Subwoofer Placement Calculator, or set position and level in Cinema Designer. | ||||
Layout verdicts
| Gap | Between | Angle | RP22 |
|---|---|---|---|
| Ear-level ring | Left front to Left surround | 74.0° | Meets L2 ≤80° |
| Ear-level ring | Left surround to Left rear surround | 48.6° | Meets L4 ≤50° |
| Ear-level ring | Left rear surround to Right rear surround | 65.6° | Meets L2 ≤80° |
| Ear-level ring | Right rear surround to Right surround | 48.6° | Meets L4 ≤50° |
| Ear-level ring | Right surround to Right front | 74.0° | Meets L2 ≤80° |
| Upper rows | Left top front to Left top rear | 90.0° | Over the limit >80° |
| Upper rows | Right top front to Right top rear | 90.0° | Over the limit >80° |
Dolby and RP22 disagree here. Every height speaker is inside its Dolby window, but RP22 limits the side-view angle between successive upper rows to 80 degrees, and these are 90 degrees apart. Dolby asks where each speaker sits; RP22 also asks how far apart neighbours are.
RP22 placement checks, target L2
- Head distance to the nearest wall or speakerRP22 parameter 12.8 m Met
- Screen speakers outside their zoneRP22 parameter 30 Met
- Largest gap in the surround ringRP22 parameter 5, limited by Rs and R74° Met
- Vertical angle between upper rowsRP22 parameter 9, limited by Ltf and Ltr90° Below
- Non-screen speakers outside their zoneRP22 parameter 110 Met
No room level is claimed: RP22 also needs output, noise and acoustics, which a placement tool cannot judge.
Where each speaker goes: the Dolby windows
This speaker placement calculator takes a layout, a room and one seat, and answers one question for every speaker: where does it go, and does it pass? The result is the angle window the speaker must sit in, a suggested position, the range of positions that also pass, and a verdict.
Dolby describes where Atmos speakers should sit as angles from the listener, not as positions in the room. At ear level the windows are measured from straight ahead: the front left and right at 22 to 30 degrees, the centre within 5, wide speakers at 45 to 60, side surrounds at 90 to 110 and rear surrounds at 135 to 150. Height speakers have two angles each, covered below. The windows are the Cinema Designer’s, taken from Dolby’s home installation guidelines.
Heights: lateral angle and side-view angle
A speaker on the ceiling is judged on two angles at once. The lateral angle is how far off the vertical line above you it sits, seen from the front of the room: 30 to 45 degrees for the top front and top rear, 30 to 60 for the top middle. The side-view angle is how high it sits above the horizon, seen from the side: 30 to 55 for the top front, 70 to 90 for the top middle and 125 to 150 for the top rear, where 90 is straight overhead and 180 the rear horizon.
The ceiling height matters because both angles are measured from your ears. A lower ceiling gives less rise above your ears, so the same angles land closer to your seat. The table shows the lateral and side-view figures for each speaker, with the window beside them.
Dolby windows and RP22 gaps
Staying inside every window is not the whole test. RP22 also limits the angle between neighbouring speakers. In the ear-level ring the limit is 80 degrees for level 2, 60 for level 3 and 50 for level 4. For the upper rows it is the vertical angle between successive speakers seen from the side, with the same three limits.
The default 7.1.4 room shows the difference. Every speaker is inside its Dolby window, yet the top front at 45 degrees and the top rear at 135 are 90 degrees apart, over the RP22 limit of 80. The calculator keeps the Dolby nominal as the default and offers an RP22 variant that moves the top speakers toward the edges of their windows to bring the gap inside the limit. A 5.1 layout fails the ear-ring limit for a different reason: two surrounds cannot close 360 degrees. That is a limit of the format, and the calculator says so.
Choosing a layout: 5.1 to 9.1.6
The tool offers the six layouts the Cinema Designer scores: 5.1, 7.1, 5.1.2, 5.1.4, 7.1.4 and 9.1.6. The last number is the count of height speakers.
- 5.1 and 7.1 have no height speakers. 7.1 adds rear surrounds, which closes the ear-level ring.
- 5.1.2 adds a pair of top middle speakers.
- 5.1.4 and 7.1.4 add top front and top rear pairs.
- 9.1.6 adds wide speakers and a top middle pair to the top front and top rear pairs.
7.1.2 and 9.1.4 are common searches, but they are not scored here. A layout needs its channel list and placement rules in the designer before the tool can answer for it. Whether you call it a home theater or a home cinema, pick the layout the room can carry, then read the verdicts.
Seat position and the room
Every angle is measured from the seat you enter, so the answer moves when the seat does. The calculator uses one seat, in a rectangular room with the screen on the front wall. Several rows, a screen on another wall, non-rectangular rooms and subwoofer position are not modelled; the Cinema Designer handles them.
Sometimes no position works. A short room with the seat close to the back wall can leave a top rear speaker unable to reach its window, and a seat very close to the screen can do the same to the top front. The table then says “No position in this room puts this speaker inside its window from this seat” and shows the nearest it can get. The fixes are to move the seat, to use a layout with fewer height pairs, or to accept the closest position knowingly.
When to go further
This page answers placement for one seat. The Cinema Designer scores every seat in every row, the sound level each channel can reach, RP22 and the rest of the room, and the Continue button opens it with your layout, room, seat and speaker positions already in place. The longer explanation of the scoring is in the speaker placement guide.