2.5 mm Balanced Headphone Output
This field counts 2.5 mm balanced headphone output sockets.
The count describes physical connections rather than audio channels. Input sockets, line outputs and plugs supplied on headphone cables are separate items.
2.5 mm Balanced Headphone Output — Digital Audio Player
On a portable player, the 2.5 mm headphone socket connects headphones to the built-in amplifier’s balanced output. This output can have a different power rating from a separate single-ended socket.
Compare the required plug and wiring with the actual headphone cable. Socket size alone does not describe output power, and a shared headphone/line socket may need the correct operating mode selected. Do not count a supplied plug adaptor as another output on the player or assume several sockets can be used simultaneously.
2.5 mm Balanced Headphone Output — Headphone Amp
On a headphone amplifier, a 2.5 mm output provides the specified balanced connection for compatible headphones and cables. The headphone cable must support the output’s wiring arrangement, not just fit the socket.
Compare the socket count with the connection your headphones require and check the power rating for that output separately. Do not assume a passive adaptor can safely turn any balanced output into a single-ended connection; use a supported wiring arrangement. Several headphone sockets do not necessarily have independent volume controls.