20"

A B 70 dB

D A 70 dB

C E 72 dB

B A 71 dB

B A 70 dB

B A 70 dB

C A 73 dB

D A 72 dB

B A 73 dB

D B 73 dB

B A 71 dB

C A 71 dB

D C 72 dB

B B 72 dB

C A 72 dB

B A 72 dB

A A 70 dB

D A 75 dB

D C 73 dB

C C 75 dB

B B 72 dB

D A 72 dB