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How do these compare to the oppo pm3? Was going to get the pm3's until I saw this drop...
The Oppo PM3 and HifiMan HE4XX are both planar magnetic headphones. The PM3 has a closed-back design and was intended for portable or travel use. If sound isolation (from your surroundings, as well as keeping your music personal) is important to you, the impressively well-made PM3 would be an excellent choice.
On the other hand, the somewhat large HE4XX headphones are meant for at-home listening. With an open-back design, they will present a larger, more-spacious sound-stage than the PM3. Just know that you will be able to hear your surroundings... and those around you will be able to hear what you're listening to.
Depend what you want. I have planar close back for portable use(audeze sines) , but still joined this drop for home listening and more air.