20"

B A 72 dB

B B 72 dB

D A 71 dB

C B 73 dB

C A 72 dB

A B 72 dB

A A 70 dB

A A 70 dB

C A 73 dB

B B 74 dB

A B 72 dB

A A 73 dB

C A 71 dB

C E 70 dB

C A 70 dB

D A 70 dB

A A 69 dB

D E 70 dB

B A 69 dB

C C 72 dB

A A 69 dB

B A 69 dB

E E 73 dB

A B 72 dB