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). 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 0.36  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]

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