**Subwoofer Box Comparison Calculator:**

Compare bandpass, sealed and vented frequency output graphs

for a subwoofer in one program.

Solving for free air reference efficiency.

Inputs:

sound pressure level (SPL) = 0 = 0 decibel |

free air reference efficiency (n _{0})= NOT CALCULATED |

Select to solve for a different unknown

constant

constant | |

speaker system total Q at f_{c} | |

speaker total Q at f_{s} |

efficiency bandwidth product

efficiency bandwidth product | |

speaker resonance frequency | |

speaker electrical Q |

system resonance frequency

system resonance frequency | |

speaker system total Q at f_{c} | |

speaker resonance frequency | |

speaker total Q at f_{s} |

minus three decibel half power frequency

minus three decibel half power frequency | |

system resonance frequency |

net internal box volume

net box internal volume | |

air volume with same acoustic compliance as the speaker suspension | |

constant |

free air reference efficiency

free air reference efficiency | |

speaker resonance frequency | |

air volume with same acoustic compliance as the speaker suspension | |

speaker electrical Q |

sound pressure level

maximum air volume displaced by cone excursion

cone effective radiation area

K_{1} constant

K_{2} constant

A_{max} constant

maximum displacement limited linear power output

required electrical input to achieve P_{ar}

peak sound pressure level

sound pressure level | |

free air reference efficiency |

maximum air volume displaced by cone excursion

maximum air volume displaced by cone excursion | |

cone effective radiation area | |

cone peak linear displacement |

cone effective radiation area

cone effective radiation area | |

cone diameter plus one third of surround |

K

K_{1} constant | |

air density | |

system resonance frequency | |

maximum air volume displaced by cone excursion | |

sound speed in air |

K

K_{2} constant | |

K_{1} constant |

A

A_{max} constant |

maximum displacement limited linear power output

maximum displacement limited linear power output | |

K_{1} constant | |

A_{max} constant |

required electrical input to achieve P

required electrical input to achieve P_{ar} | |

maximum displacement limited linear power output | |

free air reference efficiency |

peak sound pressure level

peak sound pressure level | |

maximum speaker power input |

References - Books:

1) Dickason, Vance. 1991. The Loudspeaker Design Cookbook. Audio Amateur Press. 4th ed.

2) Steele, Brian. 2002. The Subwoofer DIY Page v1.1. http://www.diysubwoofers.org.

1) Dickason, Vance. 1991. The Loudspeaker Design Cookbook. Audio Amateur Press. 4th ed.

2) Steele, Brian. 2002. The Subwoofer DIY Page v1.1. http://www.diysubwoofers.org.

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