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EN ISO 3744:1995
Reflecting surface of concrete or non-porous asphalt
K 2A = 0
If the largest dimension of the reference parallelepiped does not exceed 8 m:
hemisphere/six microphone positions according to Part A item 5/according to Part A item 5
If the largest dimension of the reference parallelepiped exceeds 8 m:
parallelepiped according to ISO 3744:1995 with measurement distance d = 1 m
The noise tests shall be carried out according to Part A item 2.2
The period of observation shall at least be 15 seconds