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Friday, May 26, 2017
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 Sixth-Order Bandpass Subwoofer Enclosure

 
Explanation of Terms
Qts, Vas, and Fs, are the electro-mechanical parameters for your woofer. ("Thiele-Small" parameters)
F3(l) - the frequency where the response is down by 3 dB (on the low end of the passband).
F3(h) - the frequency where the response is down by 3 dB (on the high end of the passband).
Vf - the internal volume of the front chamber of the enclosure.
Vr - the internal volume of the rear chamber of the enclosure.
Fb(f) - the frequency that the vent in the front chamber of the enclosure needs to be tuned to.
Fb(r) - the frequency that the vent in the rear chamber of the enclosure needs to be tuned to.
Passband - refers to the range of frequencies that will be allowed to pass through the speaker system (the frequencies you will be able to hear/feel). Any frequencies above or below the passband will be attenuated (reduced).
Gain - the amount of boost(or in some designs the amount of attenuation) in sound pressure level(SPL).
Bandpass Subwoofer Enclosure Image

Typical Sixth-Order Bandpass Enclosure.
Calculate Your Enclosure
 This calculator will design a 6th order bandpass enclosure. This calculator is only for Qts values from 0.18 to 0.28
 Note : Too much gain can be hazardous to your speakers, try to keep it +3 dB or less.


Number of Drivers :
Isobaric Loading : Yes    No  
Qts : Vas :  [Ltr] Fs :
 
Vf =  [Ltr] Vr =  [Ltr]
Fb(F) =  [Hz] Fb(R) =  [Hz]
Passband =  [Hz]
Gain =  [dB]



Calculate Vent Length for front- or rear chamber

Vent Diameter:  [cm]
Tuning Frequency (Fb(f) or Fb(r)):  [Hz]
Enclosure Volume (Vf or Vr):  [Ltr]
Number of vents: 

Vent length = 

[cm]
Vent Area:  (you can change this to recalculate Vent Diameter & Length) [cm2]