Enter the amplifier’s output resistance (output impedance) and the speaker’s load impedance into the calculator to determine the damping factor. This value is commonly used to estimate how strongly the amplifier’s source impedance can electrically “damp” the speaker’s motion.
Damping Factor Formula
The following formula is used to calculate the damping factor:
DF = Z/R
Variables:
- DF is the damping factor (unitless)
- R is the amplifier’s output impedance (output resistance) (ohms)
- Z is the speaker/load impedance (ohms)
To calculate the damping factor, divide the speaker/load impedance (Z) by the amplifier’s output impedance (R).
What is a Damping Factor?
The damping factor is commonly used as an indicator of an amplifier’s effective source impedance as seen by the loudspeaker, and how strongly the amplifier can electrically “damp” the motion of the speaker cone. It is defined as the ratio of the speaker/load impedance to the amplifier’s output impedance. A higher damping factor (lower output impedance) typically means the amplifier and cable resistance have less effect on the speaker’s electrical damping. It is an important parameter for audio enthusiasts and professionals when matching amplifiers with speakers.
How to Calculate Damping Factor?
The following steps outline how to calculate the Damping Factor.
- First, determine the amplifier’s output impedance (output resistance) (R) in ohms.
- Next, determine the impedance of the speaker/load (Z) in ohms.
- Use the formula from above: DF = Z / R.
- Finally, calculate the Damping Factor (DF).
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Amplifier output impedance (R) = 0.08 ohms
Impedance of the speaker/load (Z) = 8 ohms
