19"

B B 72 dB

B B 71 dB

C B 70 dB

B D 73 dB

B A 71 dB

D B 71 dB

C B 72 dB

B A 70 dB

B C 73 dB

B B 71 dB

A B 73 dB

B B 72 dB

B B 71 dB

C C 71 dB

A A 70 dB

A A 73 dB

C C 72 dB

D C 71 dB

C A 72 dB

A B 70 dB

B E 73 dB

C C 73 dB

C D 69 dB