20"

C A 72 dB

C C 73 dB

C C 71 dB

C C 72 dB

C A 70 dB

D B 71 dB

D C 72 dB

B A 71 dB

B A 72 dB

C B 71 dB

C B 72 dB

B B 73 dB

C C 71 dB

C C 71 dB

C A 70 dB

D D 75 dB

C D 72 dB

D C 71 dB

C A 72 dB

D A 73 dB

C B 73 dB

C C 71 dB

C D 73 dB