Headphone The Headphones page provides level control for the system's headphone output. Headphone Level Parameter Values Default Description Gain -80 dBFS to -18 dBFS; up to 0 dBFS with High Gain enabled - Sets the headphone output level. With High Gain disabled, the available range is -80 dBFS to -18 dBFS. Enable High Gain On / Off - Extends the available gain range up to 0 dBFS.