Sonitus

Absorption comparison

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Sound absorption coefficient αs

Red parts of the curves are not official ISO 354 measurements (bands below 100 Hz, measurements in the corner of the room).

0.0 0.2 0.4 0.6 0.8 1.0 1.2 50 Hz 63 Hz 80 Hz 100 Hz 125 Hz 160 Hz 200 Hz 250 Hz 315 Hz 400 Hz 500 Hz 630 Hz 800 Hz 1 kHz 1.25 kHz 1.6 kHz 2 kHz 2.5 kHz 3.15 kHz 4 kHz 5 kHz 50 Hz: α = 0.17 63 Hz: α = 0.48 80 Hz: α = 0.80 100 Hz: α = 0.66 125 Hz: α = 0.85 160 Hz: α = 0.99 200 Hz: α = 0.88 250 Hz: α = 0.96 315 Hz: α = 0.98 400 Hz: α = 0.90 500 Hz: α = 0.84 630 Hz: α = 0.81 800 Hz: α = 0.73 1 kHz: α = 0.72 1.25 kHz: α = 0.62 1.6 kHz: α = 0.54 2 kHz: α = 0.53 2.5 kHz: α = 0.49 3.15 kHz: α = 0.46 4 kHz: α = 0.45 5 kHz: α = 0.41 Frequency
50 Hz63 Hz80 Hz100 Hz125 Hz160 Hz200 Hz250 Hz315 Hz400 Hz500 Hz630 Hz800 Hz1 kHz1.25 kHz1.6 kHz2 kHz2.5 kHz3.15 kHz4 kHz5 kHz αwClass
0.170.480.800.660.850.990.880.960.980.900.840.810.730.720.620.540.530.490.460.450.41 0.55D

ISO 354 – Institut IGH, Zagreb, test report EN-2160/060/15-103/15, 2015-12-21 (100–5000 Hz). Bands below 100 Hz are outside the ISO 354 range.