19"

B A 72 dB

D B 72 dB

A B 73 dB

A C 73 dB

B A 70 dB

C B 71 dB

B B 71 dB

C C 73 dB

A B 71 dB

B B 69 dB

D C 72 dB

C B 71 dB

B A 70 dB

B B 71 dB

A B 70 dB

C B 71 dB

A B 71 dB

A A 70 dB

D A 72 dB

B A 71 dB

D C 71 dB

C C 71 dB

D A 73 dB

D A 72 dB