Data demonstrates No.1 characteristic as speaker sound absorption material!
Glass wool,wool,cotton,urethane foam and carbon paper wool is used as conventional sound absorption material.These materials did not have flat sound absorption characteristic.This is because,fibrous cell of each material was uniform.This made the particular peak and dip.
We adopted natural silk for PSA-100.The reason is,natural silk material alone has a random fibrous cell.Natural silk has a flat sound absorption without having particular peak and dip.
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