20"

B B 73 dB

D A 74 dB

B C 73 dB

D A 72 dB

C A 72 dB

A B 71 dB

B B 71 dB

B C 71 dB

C B 73 dB

B A 73 dB

A A 69 dB

C B 73 dB

D A 72 dB

A A 72 dB

C C 72 dB

B A 72 dB

D A 75 dB

D A 72 dB

C C 72 dB

C C 71 dB

B C 71 dB

A B 69 dB

C D 72 dB

C A 72 dB