A review I wrote, it is probably a bit basic for this fourm.
Check it out. https://tlrtechnology.com/2019/11/13/hifiman-he4xx-review-your-first-dive-into-planar-headphones/
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Nice write up 
Glad you ended up liking them in the end lol
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Yep, very pleased with them overall. Now what to buy next…lol 887 perhaps. Actually I think I’m getting the new Geshelli amp
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Is there a mod tutorial for that?
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Y’know, I never imagined that burn-in would really do much of anything until I tried these. Sounded s little flat at first until a while afterwards when things just “popped” out more than I remembered.
So glad this was my introduction to good audio. That soundstage and the things planar drivers have pretty much put me in the camp of almost exclusively buying planar headphones in the future lol
On another note, I think this headphone has taught me what proper bass is for the most part, so I’m pretty grateful for that too-
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They’re a beauty set of headphones and a great place to start and even finish (at least for awhile lol)… glad you’re enjoying them… got them plugged into an amp?
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Yep, took me long enough, but got em plugged into an Asgard 3 with an Apple dongle as my acting DAC for now. But man these things really sing!
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They do love their power lol
I keep having one kid bitch about how loud they are whenever I’m out and about with mine. Nearly beat the shit out of him when he came up from behind and yanked out one side by the cable and tried saying I was gonna damage my ears. Now he just tries flagging me down and telling me to turn it down cause my “music is trash”. Clearly the only logical response is to turn it up.
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yo that guy would be in a body bag if he did that shit to me, what kind of environment are you in that you have people who think it’s okay to do shit like this?
Yeah, What he said.
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Welcome to Job Corps.
I’ve owned a pair of these for about 8 months and I have reached my end game for cans. I’m not even curious about other headphones. I prefer planars over diaphragm. The bigger the diaphragm driver, the more it feels like pressurized sound being forced down my ear canal. The Sony MDR-7 (70mm drivers) were so bad with that, I sent them back. Found these on Massdrop and never looked back. The price, level of comfort, sound quality and build quality, in my opinion, makes these cans the solid under $200 champion.
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Good to hear at least one person around here has found endgame true enlightenment 
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I’ve owned the 4xx for a short time now and I really do like them. Im curious on purchasing some bigger pads since the current ones get a little uncomfortable after some time wearing them. Could anyone recommend a few pair of pads to choose from or any links to show where they are located?
I don’t have a pad rec but I do recall the pads becoming more comfortable after breaking them in. They drove me nuts at first but I ended up liking them.
ZMF has the widest pad selection for comfort. Just check out the inner dimensions/ear cavity measurements to find one that will fit well for you. They’re all super comfy in terms of material anyway. Whether you should get leather/suede or velour depends on your climate (especially humidity) and what you prefer.
The zmf pads that get recommended the most for the 4xx are the ori pads. Either the solid lambskin or perforated lambskin I believe are recced for the best sound. But just so you know they will change the sound.
Depends on your ears. The Ori are the same size as the stock Focus A pads, that’s why people recommend them, but if your ears are still getting squished it doesn’t matter much how close they sound. Not when you’re paying an extra $60.