Fourth Order Bandpass Subwoofer Box Equations Formulas Design Calculator Qts Speaker Total Q

4th Order Bandpass Subwoofer Box Equations Formulas Design Calculator
Low Frequency Enclosures - Car Audio - Home Theater Sound System

Solving for speaker total Q.

note:

for S=0.7	use	b=0.7206
for S=0.6	use	b=0.9560
for S=0.5	use	b=1.2712

Inputs:

ported front chamber net volume (V_f)
equivalent air compliance (V_as)
overall bandwidth (S)

Conversions:

ported front chamber net volume (V_f)	=	=	inch^3
equivalent air compliance (V_as)	=	=	inch^3
overall bandwidth (S)	=	=

Solution:

speaker total Q (Q_ts)

HAS NOT BEEN CALCULATED

Other Units:

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Fourth Order Bandpass

sealed rear chamber Q

	sealed rear chamber Q
	passband ripple
	sensitivity gain

low frequency f₃ rolloff

	low frequency f₃ rolloff
	speaker resonance frequency
	speaker total Q

high frequency f₃ rolloff

	high frequency f₃ rolloff
	low frequency f₃ rolloff
	speaker resonance frequency
	speaker total Q

front chamber port tuning frequency

	front chamber port tuning frequency
	sealed rear chamber Q
	speaker resonance frequency
	speaker total Q

ported front chamber net volume

	ported front chamber net volume
	overall bandwidth
	speaker total Q
	equivalent air compliance

sealed rear chamber net volume

	sealed rear chamber net volume
	equivalent air compliance
	sealed rear chamber Q
	speaker total Q

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:

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.