The sound-absorbing coefficient which shows decrease of acoustic, water absorption degree means it reveals coefficient of correlation of reverberation hour with the remainder acoustic diminishing fact from the sample in the reverberation room.
 
 
   
Hole Diameter : 0.7mm

Open Area

 : 1.5%
 
   

Hole Diameter

 : 0.7mm

Open Area

 : 1.5%

 
   

Hole Diameter

 : 1.8mm

Open Area

 : 21%
 
   

Hole Diameter

 : 2.0mm

Open Area

 : 22%

 
   

Hole Diameter

 : 2.5mm

Open Area

 : 16%
 
   

Hole Diameter

 : 3.0mm

Open Area

 : 14%

 
   

Hole Diameter

 : 3.2mm

Open Area

 : 21%
 
   

Hole Diameter

 : 3.5mm

Open Area

 : 24%

 
   

Hole Diameter

 : 6mm

Open Area

 : 35%
 
   

Hole Diameter

 : 8mm

Open Area

 : 35%
 
 
   

Hole Distance

 : 10mm

Open Area

 : 17%