Calculating Port Air Speed




This calculator is intended to help you determine the speed of the air in the port.

This will help you decide if a particular port is too small for your application, which will cause noise at high volume levels.

This calculator is not intended for use on bandpass designs.

 
 
A general rule regarding port air speed is to try to keep it 10 % or less of the speed of sound <= 342 meters
 
 

Explanation of Terms


 
  W is the acoustic power output of the speaker in Watts.
( You can calculate the Acoustic Power by multiplying the  reference efficiency times the power handling of the speaker. )
Fb is the tuning frequency of the enclosure.
R is the radius of the port.
Mach is the speed of sound in air (342 m/sec).

 
 


W acoustic power :



Fb tuning frequency of the enclosure :

 Hz

R radius of the port. :

 cm



   % of Mach.   Meter per second.
 


Click here to calculate the Driver Reference Efficiency





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