I have a bit of an amateur headphone collection and my favorite way to listen to music is my trusty old Sennheiser hd650 (thanks to dankpods I now exclusively pronounce it huu duuh 650) headphones and either a desktop tube amp if I’m listening from my laptop or the equally trusty portable fiio a5 headphone amp for listening from my phone. It takes a usb-c to female 3.5mm adapter from my phone then a short 3.5mm male-male into the amp and standard 3.5mm output on the amp for plugging in the headphone. It is certainly not ergonomic or comfortable to carry around and hold the amp with my phone but if I’m playing like tidal master quality audio or even apple music’s high definition lossless the difference between this wired setup and even pricier bluetooth headphones is clear as far as fidelity. I stupidly got the apple airpods max a while back and I mean they’re fine they’re good but you can obviously tell where apple engineered around bluetooth limitations. Spatial audio (apple’s proprietary stereo surround tech) is nice to mimic a reasonable soundstage in them but my sennies with the big loud power hungry driver and open back design makes it sound natural and pair it with a high bitrate lossless song it always sounds better on them. I also have a pair of bluetooth capable ath-150s but always use them wired. Allegedly the airpods max supports full quality if you wire them to an iPhone using a particular cable that apple sells but like… lmao common