| 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).
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| 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).
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Typical Sixth-Order Bandpass Enclosure. |
Sixth-Order Bandpass Subwoofer Enclosure