Got myself some custom balanced cables from Oidio Sound in the UK for my Philips Fidelio x3. : r/headphones
Philips Fidelio X3 Review | headphonecheck.com
Amazon.com: PHILIPS Fidelio X3 Professional Studio Monitor Headphones for Recording & Mixing Wired Over The Ear Open-Back Headphones, Multi-Layer 50mm Diaphragms, Hi-Res Music Studio Headset, Premium Finishing : Electronics