Home Theater Systems Car Audio Formulas

Compare bandpass, sealed and vented frequency output graphs for a subwoofer in one program.

diameter of vent (Dv)

= 0

= 0

centimeter

number of ports (Np)

= 0

= 0

volume of box (Vb)

= 0

= 0

liter

frequency of box (fb)

= 0

= 0

hertz

end correction factor (k)

= 0

= 0

vent length (Lv)

= NOT CALCULATED

Select to solve for a different unknown

Subwoofer Box and Speaker Enclosure

vent or port length | |

minimum vent or port diameter |

k values:

vent has one free end and one flanged | = | 0.732 |

vent has two free ends | = | 0.614 |

vent has two flanged ends | = | 0.850 |

Where

Lv | = | length of port or vent |

Dv | = | diameter of port or vent |

Dmin | = | minimum diameter of port or vent |

Np | = | number of ports or vents |

Vb | = | volume of box |

fb or Fb | = | tuning frequency |

k | = | end correction factor |

Sd | = | surface area of subwoofer |

Vd | = | driver displacement volume |

Xmax | = | maximum linear displacement of driver |

References - Books:

See 6 on reference page

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