18"

B A 72 dB

C B 69 dB

C B 70 dB

C A 72 dB

C A 72 dB

A A 69 dB

C A 70 dB

B E 69 dB

B A 71 dB

D B 72 dB

A B 72 dB

C C 72 dB

D B 71 dB

A B 69 dB

B A 71 dB

C C 72 dB

B A 70 dB

C A 69 dB

C B 70 dB

C A 71 dB

D B 71 dB