Can I use in-ear headphones with Reference 4? Viesturs Updated December 01, 2019 08:59 Follow No, in-ear headphones are not supported at the moment. Related articles Where do I ship my headphones for individual calibration? What is an individual headphone calibration? How long does it take to calibrate my headphones? I received my individually calibrated headphones but there is no individual calibration file. Where do I get it? (Reference 4.2 & legacy versions) User Presets in Systemwide app Comments 0 comments Please sign in to leave a comment.