Resource to calculate, building and measuring Hi Fi Loudspeakers and more...

Sunday, December 16, 2018
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   Vented Box Calculator

according to W.J.J. Hoge

This set-up provides the highest precision and a flat frequency response

A dimension ratio of 1 : 1.618 : 0.618 provides cancellation of resonating frequencies inside the enclosure,
this dimension ratio is used to calculate the cabinet dimensions.

If only Qms and Qes are known, press "Calculate Qts" button to calculate Qts.

  • Qms and Qes are optional
  • fs, Qts and Vas must be entered
Dia :   cm Diameter across the speaker cone including half of the cone-suspension
fs :   Hz Resonant frequency of the driver
Qms :   Q mechanical - needed to calculate Qts
Qes :   Q electrical - needed to calculate Qts
Qts :   Total Q of the driver
Vas :   liters Equivalent volume of compliance

  • Volume and port dimensions are recommended for optimum performance
  • Both (Volume and port dimensions) can be changed to calculate performance specifications for different size ports and enclosures

  • Enter volume of internal driver and parts
  • Calculate performance specifications before calculating port dimensions

Vdr : liters Volume of internal driver and parts
Vb : liters Desired volume for the enclosure - you may change the enclosure volume

Calculated inside Dimensions

Width =   cm          inches
Height =   cm          inches
Depth =   cm          inches
Volume Vb =   liters       in3
The bass reflex port should have at least 1/3 of the driver's diameter!
Dp : cm Diameter of port(s) - you may change the port diameter


Port area =   cm2     in2
Port length(s) =   cm       inches 

Calculated Performance Specifications

Fb =   Hz Port alignment frequency
Peak =   db Peak level
F-3 =   Hz "Cut-off" frequency at -3db