18"

B A 71 dB

C B 72 dB

C B 70 dB

A B 72 dB

C A 70 dB

D D 70 dB

C C 73 dB

B B 71 dB

B D 71 dB

E E 72 dB

C B 70 dB

B B 73 dB

B A 70 dB

C A 72 dB

C C 73 dB

B E 69 dB

B B 73 dB

B D 69 dB

C C 71 dB

C C 73 dB

C B 70 dB