Headphone Amp Power Calculator


First, find the impedance and the sensitivity on your headphone spec sheet. Below is the example where you can find the values.

Example: Headphone Specification of Sennheiser HD650


Second, input the data to below calculator. (Please refer to 7 STEPs Find Out How Much Amplifier Power is Enough for more calculation details)
Input:

Dynamic Range:
dB

Output Impedance:
Ohms

Headphone Impedance:
Ohms

Headphone Sensitivity:




Glossary:

Dynamic Range:
The ratio of the amplitude of the loudest possible undistorted sine wave to the noise amplitude. 110dB is the default value and is recommended.

Output Impedance:
Mainly come from the output resistor right after the op-amp output. It provides protection that the output of the amplifier sees screened cables or other capacitances. 10Ohms is the default value and is recommended.

Headphone Impedance:
The AC resistance of the coil of headphones in ohms.

Headphone Sensitivity:
It represents the acoustical level that the headphone transducer can produces under 1 mini-watt or 1 volt.(make sure the unit is the same as mentioned on the spec sheet)


Result:

Min Voltage Output:
Vrms

Min Power Output:
mWrms

Glossary:

Min Voltage Output:
The Min Voltage Output is needed to drive the headphones reaching the targeted Dynamic Range.
Less than 2Vrms: The headphones are good for portable use. Extra amplification is an optional.
More than 2Vrms: A headphone amplifier is required to drive the headphones.

Min Power Output:
The Min Power Output is needed to drive the headphones reaching the targeted Dynamic Range.
Less than 10mWrms: The headphones are good for portable use. Extra amplification is an optional.
More than 10mWrms: A headphone amplifier is required to drive the headphones.


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