18"

C E 73 dB

E C 72 dB

E B 75 dB

C B 72 dB

B A 70 dB

B B 71 dB

C D 72 dB

C D 72 dB

C D 72 dB

C A 72 dB

B D 71 dB

D C 72 dB

E C 71 dB

C D 72 dB

B A 71 dB

B A 70 dB