What makes HE-400 special is:
1) it is 92.5DB efficient so it can be driven by virtually anything including an iPod.
2) It has the familiar HiFiMAN sonic signature which means it is very detailed yet warm
3) It is only $399 MSRP. We price it at such a price because we finally figure out a way to mass produce hi-end sound quality planar driver headphones in a much easier way than before.