20"

C A 72 dB

C A 70 dB

C A 73 dB

B B 72 dB

C E 69 dB

D A 71 dB

C C 73 dB

C A 72 dB

A A 70 dB

C A 72 dB

A B 69 dB

B D 71 dB

C A 71 dB

C B 71 dB

C A 69 dB

C B 71 dB

C D 73 dB

C A 70 dB

B A 69 dB

A A 68 dB