Vented Ported 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.

Problem:

Solve for minimum port vent diameter.

Enter Calculator Inputs:

Solution:

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efficiency bandwidth product

	efficiency bandwidth product
	speaker resonance frequency
	speaker electrical Q

box or enclosure volume

	box or enclosure volume
	speaker total Q at fs
	air volume with same acoustic compliance as the speaker suspension

box or enclosure tuning frequency

	box or enclosure tuning frequency
	air volume with same acoustic compliance as the speaker suspension
	box or enclosure volume
	speaker resonance frequency

box or enclosure tuning frequency

	minus three decibel half power frequency
	air volume with same acoustic compliance as the speaker suspension
	box or enclosure volume
	speaker resonance frequency

peak sound pressure level

	peak sound pressure level
	speaker total Q at fs
	equivalent air compliance
	box enclosure volume

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

port or vent length

	port or vent length
	volume of enclosure or box
	tuning frequency
	end correction factor

minimum port or vent diameter

	minimum port or vent diameter
	maximum air volume displaced by cone excursion
	tuning frequency

References - Books: