20"

A D 72 dB

D E 70 dB

C C 72 dB

D B 71 dB

D C 73 dB

A A 71 dB

C B 70 dB

B A 71 dB

C A 72 dB

C A 70 dB

D A 72 dB

A A 72 dB

C C 69 dB

C B 71 dB

C B 73 dB

D A 72 dB

C B 72 dB

D B 71 dB

C A 71 dB

B A 72 dB

C A 72 dB

C A 71 dB

B A 72 dB

A A 69 dB