18"

B A 69 dB

B C 72 dB

D B 72 dB

D A 71 dB

C A 72 dB

C B 73 dB

C F 73 dB

C E 72 dB

D A 71 dB

C A 72 dB

C A 72 dB

C A 70 dB

C A 72 dB

C C 71 dB

D C 71 dB

C A 69 dB

C C 72 dB