20"

B B 72 dB

B B 70 dB

B A 72 dB

A B 71 dB

D B 73 dB

D B 73 dB

C B 73 dB

C A 71 dB

B C 68 dB

A A 71 dB

C C 73 dB

D A 72 dB

A B 72 dB

D A 71 dB

B B 70 dB

B A 69 dB

C B 69 dB

D A 72 dB

C B 72 dB

C A 71 dB

B B 73 dB

E E 73 dB

B A 71 dB