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the12volt.com - Free Technical Information for Mobile Electronics Installers
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Subwoofer Enclosure Calculators - Fraction to Decimal, Parallel, Series, Port Length, & Volume

To calculate interior volume, first convert all fractions to decimals (½ = .5) before entering the width, height, depth, or diameter, and thickness into any of our speaker box calculators below.

Subwoofer Enclosure Calculators:
Fraction to Decimal Calculator
Parallel Calculator
Port Length Calculator (round)
Port Length Calculator (slot)
Series Calculator
Volume Calculator - Rectangular Enclosures
Volume Calculator - Wedge Enclosures 1
Volume Calculator - Wedge Enclosures 2
Volume Calculator - Cylinder Enclosures

top of page Fraction to Decimal Calculator
In the fraction ½, 1 is the numerator and 2 is the denominator.
Numerator Decimal
Denominator

top of page Parallel Calculator
Enter at least 2 values and up to 10 values to calculate the resistance of speakers or voice coils connected in parallel. R = Resistance in Ohms.
R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R Total
ohms ohms ohms ohms ohms ohms ohms ohms ohms ohms ohms

top of page Series Calculator
Enter at least 2 values and up to 10 values to calculate the resistance of speakers or voice coils connected in series. R = Resistance in Ohms.
R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R Total
ohms ohms ohms ohms ohms ohms ohms ohms ohms ohms ohms
 
 

top of page Round Port Length Calculator
To calculate the port length of a round port, enter the diameter of the port (D), the box volume (Vb) in cubic feet, and the desired tuning frequency (Fb). Here is the formula we use: ((14630000*(D/2)*(D/2))/((Fb*Fb*Vb*1728)-(1463*(D/2)))) Please compare your answers with other programs that include other allowances such as tapered ports.
Port Diameter (D) Box Volume (Vb) Tuning Frequency (Fb) Port Length
inches cubic feet hertz inches

top of page Slot Port Length Calculator
To calculate the port length of a slot port, enter the width and height of the port, the box volume (Vb) in cubic feet, and the desired tuning frequency (Fb).
Port Width Port Height Box Volume (Vb) Tuning Frequency (Fb) Port Length
inches inches cubic feet hertz inches

top of page Volume Calculator - Rectangular/Square Enclosures
Measure the outside dimensions of your enclosure and the material thickness, then enter the numbers below to calculate interior volume. **Note: If you used dividers and/or braces, the volume of each divider/brace will need to be subtracted from the interior volume.
Width Height Depth Thickness Interior Volume
inches inches inches inches cubic feet
Rectangular/Square Enclosure

top of page Volume Calculator - Wedge Enclosures 1
Measure the outside dimensions of your enclosure and the material thickness, then enter the numbers below to calculate interior volume. **Note: If you used dividers and/or braces, the volume of each divider/brace will need to be subtracted from the interior volume.
Width Height Depth Thickness Interior Volume
inches inches inches inches cubic feet
Wedge Enclosure

top of page Volume Calculator - Wedge Enclosures 2
Measure the outside dimensions of your enclosure and the material thickness, then enter the numbers below to calculate interior volume. **Note: If you used dividers and/or braces, the volume of each divider/brace will need to be subtracted from the interior volume.
Width Height 1 Height 2 Depth Thickness Interior Volume  
inches inches inches inches inches cubic feet  
Wedge Enclosure

top of page Volume Calculator - Tube/Cylinder Enclosures
Measure the outside dimensions of your enclosure and the material thickness, then enter the numbers below to calculate interior volume. **Note: If you used dividers and/or braces, the volume of each divider/brace will need to be subtracted from the interior volume.
Diameter Height Thickness Interior Volume
inches inches inches cubic feet
Tube/Cylinder Enclosure
Subwoofer Enclosure Calculators:
Fraction to Decimal Calculator
Parallel Calculator
Port Length Calculator (round)
Port Length Calculator (slot)
Series Calculator
Volume Calculator - Rectangular Enclosures
Volume Calculator - Wedge Enclosures 1
Volume Calculator - Wedge Enclosures 2
Volume Calculator - Cylinder Enclosures
Subwoofer Enclosures:
Calculators: Parallel, Series, Port Length, & Volume
Second Order / Infinite Baffle / Free Air
Second Order / Acoustic Suspension / Sealed Enclosures
Fourth Order / Bass Reflex & Bandpass Enclosures
Sixth & Eighth Order / Bandpass Enclosures
Subwoofer Wiring Wizard
Thiele - Small Parameters
Brian Steele's The Subwoofer DIY Page v1.1





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BasicsCar AudioCar SecurityCruise ControlsDiodesDoor LocksOhm's LawPassive CrossoversRelaysResistorsSubwoofer Enclosures Search
the12volt.com - Free Technical Information for Mobile Electronics Installers
the12volt.com - Free Technical Information for Mobile Electronics Installers
the12volt.com - Free Technical Information for Mobile Electronics Installers
Application GuideCalculators, Charts, DiagramsDownloads/ManualsFind InstallersForumsGlossarySubwoofer WiringToolsVehicle Wiring Recent Topics
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