Absorption coefficient table

Anything with mass absorbs sound. But it depends a bit which frequencies are absorbed by which material. Below you will find a list of some commonly used building materials and how much this material absorbs a certain frequency.

This is expressed as the absorption coefficient. This is a number between 0.0 and 1.0, where 1.0 means ‘absorbs everything’ and 0.0 means ‘absorbs nothing’.

Check out the tutorial ‘DIY Acoustics’ for more information about how to use this list!

Material125 Hz250 Hz500 Hz1000 Hz2000 Hz4000 Hz
Acoustic foam (5cm)0,080,250,600,920,950,92
Carpet (heavy) on hard floor0,020,060,140,370,600,65
Fiberglass (10cm)0,390,900,990,980,930,87
Glass (window)0,350,250,170,120,080,05
Hardboard panel (2,5cm) mounted over 5cm air space0,900,450,250,150,100,10
Plywood panel (1cm)0,280,220,170,090,100,11
Rock wool (5cm)0,110,600,960,940,920,85
Velour curtains, heavy0,140,350,550,720,700,65
Velour curtains, light0,030,040,110,170,240,35
Wooden floor0,150,100,100,070,060,06

More audio tutorials?

More audio tutorials?