19"

A C 73 dB

B A 70 dB

B B 71 dB

A B 72 dB

C B 72 dB

C A 71 dB

B A 70 dB

B A 71 dB

B B 71 dB

B A 70 dB

B B 72 dB

D B 71 dB

A A 70 dB

C A 70 dB

D A 72 dB

D C 71 dB

B B 73 dB

C C 73 dB

C C 68 dB

D A 72 dB

A B 72 dB

C A 72 dB

C A 72 dB

A B 70 dB