This set-up provides the highest precision and a flat frequency response according to W.J.J. Hoge

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
  • Diameter, 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 of Enclosure

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!
Diameter of port(s) Dp = cm  ( You may change the port diameter)

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

  • You can change Enclosure Volume and the TSP Parameter

  • Change any of the fields and you will immediately see changing the Frequency Plot.
  • Move the mouse over the Plot Line and you will see the Frequency and dB values at that position.
  • You can zoom in by selecting a range with the mouse.

Calculated Performance Specifications

Vb =   Liter
Fb =   Hz Port alignment frequency
F-3 =   Hz "Cut-off" frequency at -3db
Qtc =   total Q of the speaker in an enclosure including all system resistances.

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