Design the room before you build it.
OpenHomeAV is a free home cinema design advisor. Lay out the room, screen, seats and speakers in the browser, then drag anything and watch every seat's verdicts update against the standards in the same frame.
| Viewing angle | SMPTE ST 2046-1 and THX minimums, the RP22 44 to 60° immersive band, the 15° top-of-screen limit | per seat |
|---|---|---|
| Sightline | Rear eye to screen bottom over the row in front, with the riser height that clears it | per row |
| Speaker angles | Dolby Atmos placement windows and the RP22 angular gaps, azimuth and elevation | per channel, per seat |
| SPL | RP22 level tiers against the 105 dB reference, from sensitivity, amplifier power and distance | per channel |
| First reflections | Mirror points on every wall, the floor and the ceiling, from each speaker | per surface |
| RT60 | Sabine and Eyring per octave band from the room and its treatment | per band |
Calculators that stand on their own
Each answers one question without a room design. The SPL calculator runs the same formula the designer scores with.
- Amplifier Power Calculator How many watts do you need? Enter speaker sensitivity, distance and impedance to get the amplifier power for reference peaks and the amps that deliver it.
- 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.
- Projector Throw Distance and Screen Size Calculator Where to put your projector for your screen, or what screen fits your throw, with brightness in nits for SDR and HDR, lens shift and seating angle.
- Projector Screen Size and Viewing Distance Calculator What size projector screen you need for your seat, and how far to sit from the screen you have, against SMPTE, THX and RP22, with the brightness it needs.
- Room Reflection Analyzer Visualize where sound reflections concentrate in your home theater room. See heatmaps of reflection density on every surface to identify treatment zones before buying a single acoustic panel.
- Room Mode Calculator Calculate the axial, tangential and oblique modes of a rectangular room, see where each is loud or null, and how your subwoofer placement drives them.
- Subwoofer Placement Calculator Enter your room, seat and one to four subs. See your room modes, how each reaches your seat, the predicted bass at your seat, and layouts to try.
- Speaker SPL Calculator Calculate the sound pressure level (SPL) your speakers deliver at your listening position. Find out if your amplifier has enough power for reference-level playback.