18"

C A 71 dB

C C 72 dB

B A 72 dB

D B 71 dB

C B 73 dB

C C 70 dB

C D 72 dB

C A 71 dB

C A 72 dB

C B 73 dB

D C 72 dB

D A 71 dB

C B 71 dB

C A 72 dB

D C 71 dB

C E 70 dB

D C 72 dB