Since PXC550 works via USB, i tried to connect to my iPad Pro using Apple's USB 3 Camera Adapter - that works too! it's certainly louder than on bluetooth at the same volume level on the iPad. And this setup works also on my iPhone.

By any chance, are your vouchers for kris shop? That's cos both items are in its catalog :p. Hope I'm not too late in responding, but the updated catalog now features the Backbeat Pro 2.   The T1 is on-ear whilst BB Pro is over-ear. Personally, I prefer on-ear during commutes whilst over-ear...