About 53.0 m² of mineral wool panel, 10 cm (25% of the walls and ceiling), set by the 500 Hz band. Start at the first reflection points beside and above the listening spot, then the wall behind it.
| Band | Now | Target | Absorption to add |
|---|---|---|---|
| 500 | 0.45 s | 0.30 s | +50.4 m² |
| 1k | 0.41 s | 0.30 s | +41.6 m² |
| 2k | 0.39 s | 0.30 s | +33.7 m² |
| 4k | 0.41 s | 0.30 s | +39.5 m² |
| Material | Area | Of walls + ceiling | Note |
|---|---|---|---|
| Mineral wool panel, 5 cm | 59.3 m² | 28% | Rockwool or glass wool, 40 to 60 kg/m³, with a breathable cloth. Class A above 500 Hz. |
| Mineral wool panel, 10 cm | 53.0 m² | 25% | Same material, twice as thick. Only pays off below 500 Hz, which this app does not measure. |
| Acoustic foam, 3 cm | 125.9 m² | 60% | Cheap and light, but weak at 500 Hz: you need roughly twice the area of a 5 cm wool panel there. |
| Heavy curtain, pleated, 10 cm off the wall | 125.9 m² | 60% | Velvet or molton at 500 g/m² or more, hung with folds. Thin curtains do almost nothing. |
Sabine estimate (RT60 = 0.161 · V / A) for 282 m³. A guide, not an order form: small bare rooms gain less per panel than the formula says, and nothing here covers the bass below 250 Hz.