18"

B A 69 dB

A A 69 dB

B B 72 dB

A B 69 dB

D C 72 dB

B A 72 dB

B A 70 dB

C A 72 dB

C A 71 dB

C A 72 dB

C A 72 dB

B A 69 dB

C B 72 dB

B B 73 dB

C B 71 dB

C A 71 dB

A B 70 dB

C A 72 dB

C A 70 dB

C C 72 dB

C A 72 dB

C A 72 dB

C A 71 dB

A B 69 dB