Headphone Output Impedance (Unbalanced)
Unbalanced headphone output impedance is the source impedance presented by a single-ended headphone output, measured in ohms.
It interacts with the headphone's own impedance and can affect the voltage delivered across frequency. It is different from the headphone load impedance, recommended load range and maximum output power.
Headphone Output Impedance (Unbalanced) — Headphone Amp
This value describes the amplifier's single-ended headphone socket. A low source impedance relative to the headphone impedance generally reduces their electrical interaction. If the headphone's impedance varies with frequency, a higher source impedance can alter the resulting frequency response as well as the delivered level.
Compare the specified socket, gain setting and operating mode. Feedback or selectable impedance settings can change the figure, so keep them attached. A recommended range such as 16–300 ohms describes suitable headphones, not the amplifier's own impedance. A line-output specification or a balanced-socket result should not be substituted for this headphone-output value.
Headphone Output Impedance (Unbalanced) — Digital Audio Player
On a player, this measures the single-ended headphone output used for portable listening. Its interaction with an earphone's frequency-dependent impedance can change the response, particularly when source impedance is not small compared with the load. A combined line/headphone socket may have different behavior in its two modes.
Compare the headphone mode, gain and any selected amplification mode. For a player with interchangeable amplifier modules, the figure here describes the supplied module. A balanced output can have a separate impedance, and its value should not be carried over. If the manufacturer leaves the output unspecified, retain that uncertainty rather than assuming every socket matches.