20"

A A 72 dB

C A 71 dB

C A 71 dB

C A 72 dB

B B 72 dB

D C 72 dB

A B 70 dB

C C 73 dB

C A 75 dB

C A 71 dB

B A 71 dB

A B 72 dB

A B 72 dB

C C 73 dB

D B 72 dB

A B 71 dB

C A 71 dB

A C 72 dB

C C 71 dB

D A 72 dB

C A 75 dB