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


Input Thiele/Small and Vent Parameters


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.

  • fs, Qts, Vas, Vd and Vn must be entered

TS Parameters


fs :    Hz Resonant frequency of the driver
Qts :    Total Q of the driver
Vas :    liters Equivalent volume of compliance

Vent Parameters


Vd :   cm Diameter of vent
(The vent should have at least 1/3 of the driver's cone diameter)
Vn : Number of Vents





Enclosure Calculations


Vb =   liters Calculated Enclosure Volume
Fb =   Hz Port alignment frequency
F-3 =   Hz 3dB Down Point
SPL:   dB Efficiency in dB (1W/1m)
Vn = Number of Vent(s)
Vd = cm Diameter Vent
 cm2
Vl = cm Length of vent   



  • 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.




Extended Port/Vent Calculator



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