Firstly, check if the noise is audible above the programme material?
Some users ask if the headphone output of their Xone mixer is too noisy, but with further investigation find that they are not listening with programme level material present, only to the noise floor amplified to the maximum.
Xone Series mixers are designed to be used in a loud nightclub environment, therefore the headphone amplifier needs sufficient power to be able to hear the cued channel over a club PA, often with a monitor speaker inches away from your head too!
If you are using your mixer for bedroom DJing, where volume levels are considerably lower, you might only need to set the headphone volume level between 1 and 3 to satisfy most needs.
(as all User Guides state: BE SENSIBLE, BE SAFE WITH SOUND LEVELS)
Consider playing a vinyl record (remember those!) and cueing with headphone volume set at maximum. You will hear the crackles of the lead-in groove are very loud, so you know you have to turn down the volume quickly when the music starts as it will be super loud!
At this volume, the crackles of the vinyl would be unnoticeable over the volume of the music.
If you think you still have a technical issue with your mixer, for further assistance please contact your dealer or local distributor