20"

A B 70 dB

B B 72 dB

A A 68 dB

A A 69 dB

C B 71 dB

C B 72 dB

B E 72 dB

A B 72 dB

C C 73 dB

A B 71 dB

C C 73 dB

C C 71 dB

B A 73 dB

C A 72 dB

C A 70 dB

C A 73 dB

A B 68 dB

A B 70 dB

B A 71 dB

D B 73 dB

D B 71 dB

A A 69 dB