20"

B B 72 dB

C D 72 dB

B B 72 dB

B A 70 dB

C A 73 dB

C A 75 dB

A B 72 dB

B A 72 dB

C A 72 dB

D A 71 dB

D A 73 dB

D A 72 dB

C A 71 dB

C A 73 dB

D B 71 dB

B B 71 dB

A A 71 dB

C B 72 dB

A B 70 dB

B A 70 dB

A A 70 dB

B A 71 dB