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Subwoofer Box Enclosure Design Calculator - Sealed Ported Bandpass Closed Vented
Low Frequency Enclosures - Car Audio - Home Theater Sound System






Parameter Unit Type Description 
Vas volume Volume of air equal to the speakers spring characteristics in liters. This is a Thiele Small specification or parameter.
Qts unitless Total Q of the speaker. This is a Thiele Small specification or parameter.
fs hertz Free air resonance of speaker in Hz. This is a Thiele Small specification or parameter.
Qtc unitless Total Q of the speaker and box . Also known as the total Q of the system.
Pd length Port diameter
# ports unitless Number of ports or vents installed
gain decibel db increase in the system
alignment unitless SBB4: Good response, Large enclosure, Low tuning frequency
QB3: Slightly degraded response, Small enclosure, Lower F3
SC4: Degraded response, Large enclosure, Low tuning frequency
ripple unitless S = 0.5 - Degraded response pronounced ripple
S = 0.6 - Slightly degraded response slight ripple
S = 0.7 - Best transient response no ripple


Subwoofer Box Software Downloads for Sealed, Ported and Bandpass
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Earned Value Project Management
Present Worth Economics Calculator
Constant Acceleration Motion Calculator
Statistics Equations Formula Calculator
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Body Mass Index BMI Calculator
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Automobile Fuel Economy Calculator
Gasoline Diesel

Car Truck Tire Size Comparison Calculator
Paycheck and Overtime Rate Calculator
Sale Discount Shopping Calculator - Percent Off Price

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