18"

B A 69 dB

C D 72 dB

A B 69 dB

D C 71 dB

C A 70 dB

D B 73 dB

C A 71 dB

C A 70 dB

C E 72 dB

C A 74 dB

C A 70 dB

C D 72 dB

C A 71 dB

C A 72 dB

B B 69 dB

A C 69 dB

C D 72 dB

C D 69 dB