DIN EN ISO 11654:1997-07 声学 - 建筑物中使用的吸声器 - 吸声等级(ISO 11654:1997)
Acoustics - Sound absorbers for use in buildings - Rating of sound absorption (ISO 11654:1997); German version EN ISO 11654:1997 / Note: To be replaced by DIN EN ISO 11654 (2017-10), DIN EN ISO 11654 (2018-05).