20"

A A 70 dB

B A 70 dB

B A 70 dB

C C 72 dB

C A 72 dB

A A 72 dB

A A 72 dB

A B 74 dB

C A 72 dB

A B 71 dB

C B 72 dB

A A 73 dB

C B 73 dB

C B 72 dB

B B 68 dB

C A 70 dB

B A 70 dB

C A 71 dB

B B 74 dB

A A 73 dB

A D 69 dB

C A 73 dB