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.

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Problem:

Solve for speaker electrical Q.

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Enter Calculator Inputs:

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Solution:

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Change Equation or Formulas:

Tap or click to solve for a different unknown or equation

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 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

A_max constant

Amax constant

maximum displacement limited linear power output

	maximum displacement limited linear power output
	K1 constant
	Amax constant

required electrical input to achieve P_ar

	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

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References - Books: