The ZEN Air CAN comes with three gain settings so that it works well with every pair of headphones or in-ear monitors (also known as IEMs).

What is gain? Gain in audio terms refers to an amplifier’s ability to increase the amplitude (size) of the signal from the source (input) to the headphones or speakers (output). More gain equals a stronger signal.

You will need to adjust the gain depending on the sensitivity of the headphones or iEMs you are using. For example, highly sensitive headphones need lower gain.