Speaker Formulas and Calculations

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The following chart contains commonly used conversions of length, area, and volume. Simply multiply what you want to convert by the number in the last column.

Length

Area

Volume

Electronics

In many electrical circuits, the values of components are specified in units with prefixes. This makes the numbers easier to handle without long strings of zeros.

mega = X 10⁶
kilo = X 10³
milli = X 10^-3
micro = X 10^-6
nano = X 10^-9
pico = X 10^-12

E = Potential Difference (volts)
I = Current (amperes)
R = Resistance (ohms)
P = Power (watts)

Power (watts)
E X I
I² X R
E² / R

Potential Difference (volts)
I X R
SQRT( P X R )
P / I

Current (amperes)
E / R
P / E
SQRT ( P / R )

Resistance (ohms)
E / I
E² / P
P / I²

Resistances in series
RT = R1 + R2 + R3 .... + Rn

Resistances in parallel
1/RT = 1/R1 + 1/R2 + 1/R3... + 1/Rn

Resistances in parallel (2 components)
RT = (R1 X R2) / (R1 + R2)

Capacitances in series
1/CT = 1/C1 + 1/C2 + 1/C3... + 1/Cn

Capacitances in parallel
CT = C1 + C2 + C3 .... + Cn

6dB High Pass
Series Cap = .159 / ( Impedance X Frequency )

6dB Low Pass
Series Inductor = Impedance / (6.28 X Frequency )

12dB Butterworth (high and low pass)
Capacitor = .1125 / ( Impedance X Frequency )
Inductor = ( .2251 X Impedance ) / Frequency

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