Fam, the X65 doesn't have bass because it's 10dB lower than what is perceived neutral bass shelf according to Harman. And coupled with its forward leaning upper midrange and Treble/air regions... Of course it's gonna sound bright on any solid state DAC/AMP... Better slap on some EQ or get a better tuned headphone.

Sorry if I'm coming off as aggressive😅🤝🏾 u/entivoo...

I can send you some Parametric EQ Preset to test it out