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Car Audio / Passive Crossovers, Capacitor & Coil Calculator

Use these formulas to calculate for first, second, and third order low pass, high pass, and band pass filters. Do not use these for narrow band pass filter calculations.
Before clicking for the crossover component values, enter the impedance level and the desired crossover frequency. Values should be rounded off to the nearest hundredth.

If you need a 16 mHy coil, you can series a 12.8 mHy coil and a 3.2 mHy coil. If you need a 70 fd capacitor, you can parallel two 35 fd capacitors.When the exact value of a coil or capacitor is not available, you can substitute values of ± 5%.

Crossover Calculators:
High Pass/Low Pass
Narrow Band Pass
Zobel

Passive Crossovers:
Low Pass Filters
High Pass Filters
Band Pass Filters
Narrow Band Pass Filters
Acoustical Output & Power
First Order Filters
Second Order Filters
Third Order Filters
Zobel
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4 Ohm Charts
8 Ohm Charts
Formulas & Calculators
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top of page Capacitor and Coil Calculator
Impedance Frequency    


Ohms Hertz (Hz)    
1st Order (6 dB per Octave) (diagrams)
L1 (mHy) = (1000 x Impedance) / (6.283 x Crossover Frequency) Coil - L1 Millihenries (mHy)
C1 (fd) = 1,000,000 / (6.283 x Impedance x Crossover Frequency) Capacitor - C1 Microfarads (fd)
2nd Order (12 dB per Octave) (diagrams)
L2 = L1 x 1.414 Coil - L2 Millihenries (mHy)
C2 = C1 x .707 Capacitor - C2 Microfarads (fd)
3rd Order (18 dB per Octave) (diagrams)
L3 = L1 x 1.5 Coil - L3 Millihenries (mHy)
C3 = C1 x .1.33 Capacitor - C3 Microfarads (fd)
L4 = L1 x .5 Coil - L4 Millihenries (mHy)
C4 = C1 x .667 Capacitor - C4 Microfarads (fd)
L5 = L1 x .75 Coil - L5 Millihenries (mHy)
C5 = C1 x 2 Capacitor - C5 Microfarads (fd)

<< Previous - Third Order Filters Next - Narrow Bandpass Crossover Formulas and Calculators >>

Crossover Calculators:
High Pass/Low Pass
Narrow Band Pass
Zobel

Passive Crossovers:
Low Pass Filters
High Pass Filters
Band Pass Filters
Narrow Band Pass Filters
Acoustical Output & Power
First Order Filters
Second Order Filters
Third Order Filters
Zobel
2 Ohm Charts
4 Ohm Charts
8 Ohm Charts
Formulas & Calculators
  Car Audio:
Glossary of Terms and Definitions
Ohm's Law
Passive Crossovers & Calculators
Metra Application Guides
Power and Ground Cable Sizes
Subwoofer Enclosures & Calculators
Subwoofer Wiring
the12volt's Application Guide
the12volt's Install Bay (forums)
Thiele - Small Parameters
Tools & Equipment





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Thursday, April 17, 2014 Copyright © 1999-2014 the12volt.com Donate to the12volt.com Privacy Policy Advertising
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
the12volt.com - Free Technical Information for Mobile Electronics Installers, Enthusiasts, and Do-It-Yourselfers since 1999 Donate to the12volt.com