# 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 system resonance frequency.

Inputs:
 K1 constant (K1)
 sound speed in air (c) meter/secondcentimeter/hourcentimeter/secondfoot/dayfoot/hourfoot/minutefoot/secondinch/dayinch/hourinch/minuteinch/secondkilometer/daykilometer/hourkilometer/minutekilometer/secondknotmach sea level 15 Cmeter/daymeter/hourmeter/minutemile/daymile/hourmile/minutemile/secondmillimeter/secondspeed of light in vacuumyard/second
 air density (Ro) kilogram/meter^3gram/centimeter^3gram/meter^3gram/milliliterkilogram/deciliterkilogram/litermilligram/literounce/foot^3ounce/inch^3pound/foot^3pound/bushel UKpound/bushel USpound/gallon UKpound/gallon USpound/inch^3pound/yard^3ton metric/meter^3slug/foot^3slug/inch^3
 maximum air volume displaced by cone excursion (Vd) meter^3barrel UKbarrel US drybarrel US federalbarrel US liquidbarrel US oil petroleumbushel UKbushel US drycentimeter^3cord firewoodcord foot woodcup Canadacup metriccup USdeciliterdecimeter^3foot^3gallon UKgallon US liquidinch^3kilometer^3litermillilitermillimeter^3ounce UK fluidounce US fluidpint UKpint USquart UKquart USsteretablespoon UKtablespoon USteaspoon UKteaspoon USyard^3

#### Conversions:

 K1 constant (K1)= 0 = 0
 sound speed in air (c)= 0 = 0meter/second
 air density (Ro)= 0 = 0kilogram/meter^3
 maximum air volume displaced by cone excursion (Vd)= 0 = 0meter^3

#### Solution:

 system resonance frequency (fc)= NOT CALCULATED

#### Other Units:

Change Equation
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
 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 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.

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By Jimmy Raymond

Contact: aj@ajdesigner.com