Car Audio Equations

Here's a summary of all of the equations used throughout this site. If we miss any please let us know.

Ohm's Law

E=I*R

Where

E = voltage in volts
I = current in amps
R = resistance in ohms

Power equation

P = E*I

Parallel Resistances

1/Rt = 1/R1 + 1/R2 + 1/R3...

Where

Rt = total resistance

R1-R3 = individual resistances

Series Resistances

Rt = R1 + R2 + R3...

Where

Rt = total resistance

R1-R3 = individual resistances

Wavelength

wavelength = (speed of sound)/(frequency)

wavelength = feet

speed of sound = feet per second

frequency = Hertz

SPL Calculation

10 x log10(Power) + Efficiency = Maximum Output

Power = watts

Efficiency = decibels

Maximum Output = decibels

Conversions

Kilo = 1,000

Mega = 1,000,000

Milli = 1/1,000

Micro = 1/1,000,000

1 cubic foot = 1,728 cubic inches

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