Closed Sealed Subwoofer Box Equations Formulas Design Calculator
Low Frequency Enclosures - Car Audio - Home Theater Sound System
Subwoofer Box Comparison Calculator:
Compare bandpass, sealed and vented frequency output graphs
for a subwoofer in one program.
Solving for minus three decibel half power frequency.
Inputs:
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Conversions:
speaker system total at fc (Qtc)
= 0
= 0
system resonance frequency (fc)
= 0
= 0
hertz
Solution:
minus three decibel half power frequency (f3) = NOT CALCULATED
Other Units:
Change Equation
Select to solve for a different unknown
efficiency bandwidth product
system resonance frequency
minus three decibel half power frequency
net internal box volume
free air reference efficiency
Select to solve for a different unknown
constant
 | constant |
 | speaker system total Q at fc |
 | speaker total Q at fs |
efficiency bandwidth product
 | efficiency bandwidth product |
 | speaker resonance frequency |
 | speaker electrical Q |
system resonance frequency
 | system resonance frequency |
 | speaker system total Q at fc |
 | speaker resonance frequency |
 | speaker total Q at fs |
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
K2 constant
Amax constant
maximum displacement limited linear power output
required electrical input to achieve Par
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 1 constant
 | K1 constant |
 | air density |
 | system resonance frequency |
 | maximum air volume displaced by cone excursion |
 | sound speed in air |
K2 constant
 | K2 constant |
 | K1 constant |
Amax constant
 | Amax constant |
maximum displacement limited linear power output
 | maximum displacement limited linear power output |
 | K1 constant |
 | Amax constant |
required electrical input to achieve Par
 | required electrical input to achieve Par |
 | 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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