Professional Audio (pro-audio) Headphone Amplifiers
In the pro-audio terminology a headphone amplifier is a device that allows multiple headsets to be connected to one or more audio sources at the same time in order to monitor progress of a recording session or a live performance.
Headphone amps with sub-mixing capabilities allow the listener to adjust, mix and monitor audio signals coming from multiple sources at the same time. This kind of headphone amp is often utilized during recording sessions to sub-mix playback of individual stem-mixes or instruments coming from a mixing board or a playback device. In many cases the listeners have their own sets of controls allowing them to adjust various aspects of the mix and individual and global parameters such as channel level, global loudness, bass and treble.
Distribution headphone amplifiers are specialized headphone amps allowing a single signal to be fed to multiple headsets or multiple groups of multiple headsets at the same time. Many distribution headphone amps, like the one shown here, can be cascaded by connecting the audio input of one of the amps to the cascading output, marked "THRU", of another amp.
There are also available various other combinations of pro-audio headphone amps with simultaneous sub-mixing and distribution capabilities.
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