20"

C B 72 dB

C C 73 dB

C B 71 dB

C B 73 dB

A A 73 dB

C B 73 dB

D B 72 dB

D C 73 dB

D C 74 dB

B B 71 dB

D B 75 dB

C B 70 dB

C A 72 dB

D D 74 dB

C B 69 dB

C B 72 dB

A D 70 dB

C A 75 dB

D A 75 dB

C A 72 dB

C A 71 dB

C C 71 dB