18"

A A 69 dB

D C 73 dB

C C 72 dB

C B 71 dB

B A 72 dB

C A 70 dB

B B 70 dB

C C 71 dB

A A 68 dB

A B 71 dB

C A 71 dB

B A 70 dB

D A 70 dB

A A 69 dB

D C 72 dB

C B 72 dB

D B 73 dB

B A 70 dB

B B 71 dB

A B 71 dB

B B 72 dB

C B 72 dB

B A 72 dB

B A 70 dB