20"

C C 73 dB

B C 71 dB

C C 75 dB

C A 73 dB

D C 70 dB

C B 71 dB

B A 71 dB

C A 70 dB

B A 73 dB

C A 72 dB

B D 71 dB

C A 70 dB

D B 71 dB

D B 69 dB

C D 73 dB

D B 73 dB

C B 69 dB

C B 69 dB

B A 72 dB

C B 72 dB