Dolby Atmos speaker placement: the angles for every layout
Dolby puts Atmos top speakers 45° up from the seat, in front and behind, or a single pair at 65–100° overhead. The angles for 5.1.2 to 7.1.4, by room.
Where do Dolby Atmos speakers go?
On two levels. The ear-level layer is an ordinary 5.1 or 7.1 layout, every speaker at seated ear height — about 3.9 feet (1.2 metres) in Dolby's home guideline. The overhead layer goes on the ceiling: two speakers in a 5.1.2 or 7.1.2 system, four in a 5.1.4 or 7.1.4. Dolby gives every position as an angle from the main seat rather than a distance from a wall, which is why the same layout lands in different places in different rooms. Our speaker placement calculator turns those angles into wall and ceiling positions for your room's width, depth, ceiling height and seat.
What angle should Atmos ceiling speakers be at?
With four overhead speakers, 45 degrees of elevation from the seat: the top front pair 45 degrees up and ahead of you, the top rear pair 45 degrees up and behind. Dolby allows each to move between 30 and 55 degrees if the room needs it. With only two, Dolby draws a top middle pair anywhere from 65 to 100 degrees — nearly straight above the seat, a little ahead or behind. On a 9-foot ceiling, 45 degrees puts the top front pair a little over 5 feet in front of your head; the lower the ceiling, the closer to the seat that point moves.
How far apart should Atmos ceiling speakers be?
About as far apart side to side as your front left and right speakers. Dolby's guideline sets the overhead width to match the left and right speakers at 30 degrees either side of the screen, which works out to between half and seven-tenths of the width of the whole layout, and keeps the overhead group centred front to back over the seating rather than over the room. So the ceiling speakers sit well in from the side walls; the speaker placement calculator spaces them at six-tenths of the layout's width, the middle of Dolby's range.
Where do the ear-level speakers go in an Atmos layout?
Exactly where they would without Atmos, measured from the line between your seat and the screen: front left and right 22 to 30 degrees either side, surrounds 90 to 110 degrees around, and in a 7.1 layout the rear surrounds 135 to 150 degrees. Dolby asks for all of them at the same height, ideally the same distance from the seat — and where the room makes equal distances impossible, for the difference to be set in the receiver. Rear speakers can sit higher than the fronts when the room demands it, but no more than 1.25 times their height. The speaker placement basics guide covers toe-in, the center channel and the subwoofer crawl.
Should you choose 5.1.2 or 5.1.4?
Four overhead speakers if the receiver and ceiling allow it. Dolby's guideline recommends four whenever possible — it says so of up-firing Atmos enabled speakers — because two front and two rear heights place an overhead sound — a helicopter crossing the room — more precisely than one middle pair. But 5.1.2 over a solid base is still most of the effect, and each pair needs its own amplified channels: a 5.1.4 system needs nine and a 7.1.4 eleven, which is where many receivers run out. Our guide to 5.1, 7.2 and Atmos weighs the layouts against room size, and the AV receivers we track state how many channels they amplify.
How high does the ceiling need to be for Atmos?
For ceiling speakers, two to three times the height of the ear-level speakers — roughly 8 to 12 feet with those at seated ear height. Below that the overheads sit close to your head and you hear each one instead of a sound field. For Dolby Atmos enabled up-firing speakers, which bounce sound off the ceiling, Dolby asks for a flat, acoustically reflective ceiling between 7.5 and 14 feet, ideally no higher than 12; place them at or slightly above ear height, no higher than half the wall, and at least 3 feet from any seat — ideally 5.
Check it against your own room
Angles only become positions once you know the room. Enter your width, depth, ceiling height and seat into the speaker placement calculator and pick 5.1, 7.1, 5.1.2, 5.1.4 or 7.2.4: it gives each speaker's angle and the spot on a wall or the ceiling where it lands, moves an overhead within Dolby's range when the room needs it, and flags any speaker no angle in the range can fit. Then mark the spots with tape and listen before you cut a hole in the ceiling.