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That is acceptable. If its st all audible you wouldn't be able to hear it unless you were listening directly to the port. The sound from the drivers at that point would be much louder than the port.
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Yeah, ~5% is what I use and it's never failed me, but FWIW, Richard Small concluded that 4.5% +/-10% or a 4.9% upper limit was a good rule-of-thumb. Oh well, what's 0.1% among friends? ;) Since we're more likely to hear sharp edge diffraction noise at these low vent machs, a slight rounding over is more important than whether a stock pipe size bumps it up to 6%.

GM
 
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