20"

C A 72 dB

B A 72 dB

B A 71 dB

B A 69 dB

C A 71 dB

A B 72 dB

D A 72 dB

C B 69 dB

A A 68 dB

D A 73 dB

C D 75 dB

B A 75 dB

C E 71 dB

C C 71 dB

B E 71 dB

D A 71 dB

B D 72 dB

C E 69 dB

C B 73 dB

E C 73 dB

A B 70 dB