18"

A B 71 dB

D A 72 dB

B A 69 dB

C C 71 dB

C A 72 dB

A B 70 dB

D E 71 dB

C A 71 dB

B B 71 dB

C B 71 dB

B B 72 dB

C C 73 dB

A D 69 dB

C B 68 dB

C A 70 dB

C B 72 dB

D D 72 dB

C C 70 dB