Sabine formula, T = 0.16 × V / A. Absorption coefficients used at speech frequencies (average from 500 to 2,000 Hz): tiles and concrete 0.02; wooden floor 0.08; carpet 0.30; painted walls and ceiling 0.04; furniture and textiles 0.05, 0.13 or 0.28 m² per m² of floor depending on the furnishings. EMERSPACE panel: 0.78, i.e. the average of the coefficients measured by the LNE on the EMERFLEX core between 500 and 2,000 Hz (0.87), reduced by 10% for the fabric and the thickness. Suspended baffle: both faces are exposed, so we count 2 × surface area × 0.78 (conservative estimate, to be confirmed by a measurement of the baffle as an object). Actual panel dimensions (stated format + 5 cm). Sabine is a simplified model, less accurate in very small rooms; the panels treat speech and mid frequencies, not bass. Indicative result, not a guaranteed performance. Voice: a member of the EMERWALL team; in 5-person mode, four LibriVox volunteer readers are added (public domain recordings), via the Multilingual LibriSpeech corpus (CC BY 4.0). The echo is simulated from the calculated reverberation time; listening gives an idea of the difference, not the exact sound of your room.