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n(1)=20 buah
TI(1)= 80 dB
n(2)= 2 buah
dit: TI(2)=...?
Jawab:
TI(1)=TI + 10 log n(1)
80= TI + 10 log 20
80= TI + 10 . 1,301
80= TI + 13,01
TI= 80 -13,01 = 66,99 dB = 67 dB
untuk 2 mesin:
TI(2)= TI + 10 log n
TI(2)= 67 + 10 log 2
TI(2)= 67 + 10.0,301
TI(2)= 67 + 3,01
TI(2)= 70,01 dB