This is usually referred to in speaker design with other terms, which serve to make it a valid reference point.ДЄ typical specification for a bandpass enclosure would be : GainВ -В the amount of boost(or in some designs the amount of attenuation) in sound pressure level(SPL). Any frequencies above or below the passband will be attenuated (reduced). PassbandВ -В 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). VrВ -В the internal volume of the rear chamber of the enclosure.ДЇb (F)В -В the frequency that the vent in the front chamber of the enclosure needs to be tuned to.ДЇb (R)В -В the frequency that the vent in the rear chamber of the enclosure needs to be tuned to. VfВ -В the internal volume of the front chamber of the enclosure. This will be the second number in the 'Passband' box when you calculate an enclosure. This will be the first number in the 'Passband' box when you calculate an enclosure.ДЇ3 (H)В -В the frequency where the response is down by 3 dB (on the high end of the passband). You can get these from the paperwork that came with your speakers, from the dealer where you purchased your speakers, or from the manufacturer of the speaker (they are sometimes hard to contact, however).ДЇ3 (L)В -В the frequency where the response is down by 3 dB (on the low end of the passband). They are also commonly referred to as the 'Thiele-Small' parameters.

Qts, Vas, and Fs, are the electro-mechanical parameters for your woofer.

Sixth-Order BANDPASS SUBWOOFER ENCLOSURE DESIGN calculator Sixth-Order Bandpass Subwoofer Enclosure Design Calculator

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