My rambling noob comparison between the X2HR and HD599 : r/headphones
FIDELIO X2 REVISIÓN COMPLETA EN ESPAÑOL Y COMPARACIÓN CON EL SENNHEISER HD599 - YouTube
Geekria QuickFit Boom Mic Headphones Cable for Gaming & Meeting, Compatible with Sennheiser HD-599 579 569 559 569 559 558, 2.5mm Replacement Cord with Microphone and Volume/Mute Control (6ft)
SENNHEISER HD 599 Open Back Headphone, Ivory
Sennheiser HD 599 SE Around Ear Open Back Headphone - Black