Everything is drawn to real size; the scale bar under the room shows 5 feet. A red pulsing halo means a speaker is badly placed, amber means it could be better; click it to see why. Delete removes the selected item, R rotates it 15°.
- Click a speaker, the seat or furniture to select it
- Drag it across the floor to move it
- Drag the blue ring to turn it
- Drag the blue arrow up or down to set speaker height
- Arrow keys nudge 1″ (Shift: 6″)
- Drag empty space to look around; scroll to zoom
Rings under each speaker show placement: green good, amber could be better, red needs fixing. Turn on Edit walls to drag walls and the blue corner balls. Exact numbers for whatever you select appear on the right.
Section cut along the centre line, from the front wall (left) to the back of the room: ceiling profile, speaker and tweeter heights, and elevation angles.
This is the printable layout sheet. Printing is turned off inside this viewer, so open the standalone copy of the planner in your browser and press Print layout, or use Copy measurements for a text version.
Speaker system
Placement method
Your speakers
Front left / right
Center channel
Surrounds & wides
Height (Atmos)
Subwoofer
My rooms & typical rooms
Saved rooms stay in this browser.
Copy or paste a room as text
Move a room between browsers or send it to someone.
Results
Placement score
Live 3D
Main speakers & seat
Every seat
Every speaker
Front-wall distance is square to the front wall, to the speaker's front face. Side-wall distance is to the cabinet centre. Heights are to the tweeter.
Receiver setup
Accuracy details
Wall sound treatment & reverb
Acoustic panel spots
Speaker cable runs
Room checks
How the numbers are worked out
- Coordinates: distances are measured square to the front wall, to each speaker's front face, and to the cabinet centre from the side walls; heights are to the tweeter centre; all distances to the seat are 3D, to ear height.
- Front L/R: stereo layouts aim for ±30° (equilateral triangle, ITU-R BS.775); surround layouts check Dolby's 22–30°. The seat defaults to 38% of the room depth from the back wall, or sits where you place your sofa or chair.
- Surrounds and wides: Dolby home-theater angles: 5.x sides 100–120°, 7.x sides 90–110°, rears 135–150°, front wides about 60°; dipoles at 90°.
- Atmos heights: Dolby elevations from the seat: top front 30–55°, top middle 65–100°, top rear 125–150°, solved against your actual ceiling height and slope.
- Aim: on-axis error is the angle between where the speaker points (toe-in, tilt) and the line to your ears.
- Bass: axial modes f = n·1130/(2·L), Schroeder frequency 2000·√(0.4/V), front-wall cancellation f = 1130/(4·d); the wave simulations solve the acoustic wave equation (2D FDTD) at ear height.
- Reflections: mirror-image method for side walls and ceiling; delay is the extra path length ÷ 1130 ft/s.