How design vent silencer pwl and spl

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reza1211
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we speak about vent silencer and octave band and sound pressure level and sound power level and diffuser pipe
 
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No offense, pal, but that makes absolutely no sense. Can you try to articulate your question in a manner that we can read?
 
vent silencer use from reduction and control noise and from inverse square low and max noise create at frequency 2 KHz
 

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