During the recording and compression of digital music, details and dynamics of the live music get lost. FullSoundis a smart algorithm, running on a powerful chip inside the headset. It improves the quality of your music and restores the music's original dynamics, stereo effects, bass and treble to reveal previously unheard detail without distortion. FullSound is enabled out of the box and can be turned off and on. (Check your user manual for details).