Headphones version identifier

Change log provides a overview of the different versions of the S4X, S4R, and S5X models along with the specific changes made in each version.

VERSION CHANGE LOG
S4X 1.0 Original model
S4X 1.1 Cable position changed to angled
S4X 1.2 Female plugs changed for PCB integrated, updated cable reverse compatible
S4X 1.3 Same as 1.2 acoustically but with calibration plugin included and Waves Nx compatible
S4R 1.0 Original model, based on S4 model (not S4X)
S4R 1.1 Same chassis as S4X model upgrade, so updated to match S4X 1.1 chassis
S4R 1.2 Female plugs changed for PCB integrated, updated cable reverse compatible
1.2 sound: Slight adaptation of target curves, some customers may notice it. Visible in measurements report published online.
S4R 1.3 Same as 1.2 acoustically but with calibration plugin included and Waves Nx upgradable
S5X 1.0 Original model
S5X 1.1 Same as 1.0 but with calibration plugin included

 
You can use the identifier tool for a direct version lookup based on the serial number. Locate this serial number either on the Certificate of Authenticity or the Calibration Certificate, depending on your headphone model.

Alternatively, you can uncover the serial number by removing the earpads. Look for it on a sticker placed on the speaker protector.

Version identifier link