Estimate RT60 and size the treatment
Assign a material to each surface, add the audience, read the reverberation time per band against the DIN 18041 target, and find out how much absorber would fix it.
On this page
The RT60 Estimator on the Room Modes tab turns the room's dimensions and surfaces into a reverberation-time estimate, empty and occupied. The Treatment Sizing card turns the gap between that estimate and a target into square metres of absorber.
The model
RT60 is computed with Eyring at every absorption level — it tends to Sabine in live rooms and stays right in dead ones — plus the air absorption term 4mV from ISO 9613-1, which matters at 2–4 kHz in large rooms. The air follows the temperature and humidity on the EQ & Delay tab.
Assign materials
- Enter the room in Room Dimensions first — the estimator uses its surface areas.
- Pick a material for each surface: floor, ceiling and each wall — painted and unpainted concrete or brick, plaster, drywall, glass, wood floor, vinyl, carpet, curtain, acoustic foam, suspended tile, upholstered seating, perforated panel.
- Next to each surface its absorption coefficient at 500 Hz (α) is shown.
- Read the RT60 per octave band. The colours compare each band with the DIN 18041 music target for this volume — a big hall is allowed a longer RT60 than a club.
Add the audience
An audience is absorption too. Choose Seated or Standing, and enter either the Density (people per m²) or the Audience count. The occupied row shows the room as the show hears it; the speech and music verdicts and the Results tab use it.
Size the treatment
In Treatment Sizing, set a Target RT60 and pick the absorber Material (including Basotect panels, with a panel count); the card reports the additional absorber area in m² per band. The calculation inverts the same Eyring model and counts that the absorber covers a surface that was already absorbing a little. If the area exceeds the room's surface, the card says so. Use it as a first estimate for a conversation with a supplier.
Air absorption
The Air Absorption card on the EQ & Delay tab shows the high-frequency loss over a distance (ISO 9613-1, exact), and the Results tab the HF Loss at Back Row for the current room.
Save the room
Press Save in the top bar. Export writes the profiles to a JSON file a colleague drops in with Import. Profiles sync across your own devices — see Account sync.
RT60 here is an estimate from dimensions and coefficients. A measured decay from REW or Smaart will differ, sometimes a lot, in rooms with coupled volumes or heavy furnishings. Predict here; measure there.
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