rlw6534
Headphoneus Supremus
I use Apple Music lossless with my Mac and iPhone using the FiiO BTR5, with the USB-c cable for Mac, and with their LT-LT1 USB type-c to Lightning data cable with iPhone and my Beyerdynamic T5 3rd gen. Sounds great to me.
Would I get any upgrade if I switch to using a DAP that supports Apple Music lossless? Like the FiiO M11 Plus?
I guess I'm in the minority here, but the BTR5 should drive your phones just fine, especially in balanced mode. I would not expect much sound quality difference from a DAP when compared with USB DAC mode from the BTR5. And yes, I have and use both a BTR5 and an M11 Plus ESS.