19"

C B 72 dB

C A 71 dB

C A 68 dB

C B 71 dB

C D 72 dB

D A 72 dB

D A 68 dB

C B 71 dB

D A 73 dB

A B 71 dB

C A 70 dB

C A 71 dB

C A 70 dB

A B 69 dB

A B 72 dB

A A 69 dB

C C 73 dB

C A 71 dB

A B 72 dB

B A 73 dB

A A 72 dB

D A 70 dB