20"

D C 74 dB

C A 73 dB

D A 72 dB

B A 73 dB

D B 73 dB

B A 71 dB

D C 73 dB

C C 75 dB

C A 71 dB

C A 71 dB

B B 72 dB

C A 72 dB

B A 72 dB

B B 72 dB

D A 72 dB

B A 72 dB

C D 73 dB

D B 71 dB

C C 71 dB

C A 70 dB

B A 70 dB

A A 69 dB

B B 72 dB

B B 70 dB