20"

C E 71 dB

C A 72 dB

D D 71 dB

C C 72 dB

D D 70 dB

D C 72 dB

C A 71 dB

C C 74 dB

D B 73 dB

C B 69 dB

B B 73 dB

B A 71 dB

C C 73 dB

C C 72 dB

B A 75 dB

D B 73 dB

B A 72 dB

C A 73 dB

B C 73 dB

D B 71 dB