Can I use in-ear headphones with Reference 4? Viesturs Updated January 05, 2020 13:57 Follow No, in-ear headphones are not supported at the moment. Related articles What is an individual headphone calibration? Where do I ship my headphones for individual calibration? I received my individually calibrated headphones but there is no individual calibration file. Where do I get it? (Reference 4.2 & legacy versions) How long does it take to calibrate my headphones? User Presets in Systemwide app Comments 0 comments Please sign in to leave a comment.