Got myself some custom balanced cables from Oidio Sound in the UK for my Philips Fidelio x3. : r/headphones
Philips Fidelio X2 : prix, test, avis et actualités - Les Numériques
Original Philips X2HR headphones With 50 mm highpower drive 3meters Line Length for Samsung Huawei Xiaomi Android/IOS Smartphone|Headphone/Headset| - AliExpress