Oh sorry- totally spaced on these I keep forgetting they exist. Oppo PM3. $399 on Amazon.com (you have to click them then click see all buying options and there's only one seller).

I used to have these and had to tragically sell them when I ran into financial trouble BUT this is the one planar magnetic headphone that you can run off pretty much anything and it sounds good. You can even run them off those little 3.5mm to USB C dongles. That's not ideal, and I'd still suggest at least a dragonfly, but they sounds pretty damn good straight off a phone, and they will definitely get loud with no clipping. You get most of the planar benefits that would come with the 400SE/400i/4XX with less drawbacks (better build quality, closed back, smaller driver is quicker and doesn't get muddy, better bass). The only place I'd say the 400SE beat the PM3 is in smokey female vocals, which most music doesn't have, but if you were Dianna Krall's number one fan I'd stear you to Hifiman or LCD.

Sorry for 3 posts in a row. I'd say my 2 best recommendations that are the most bulletproof are Momentum 4 and PM3. PM3 is $100 more but sounds like $300 more, but is also not wireless, and you really ought to consider the Dongle DAC. Momentum 4 is $300 one time and done.