One of the very best efficiency planar headphones within the world! HIFIMAN’s newest HE400SE open back planar headphones sounds amazing on your smartphone or most any portable audio device. The HE400 series headphones has been winning hearts of critics and music lovers round the world. With the HE400SE headphones, HiFiMAN gives another reason for you to fall crazy with the HE400 series. The brand-new HE400se may be a dynamic planar headphone with a complicated conductive layer that covers the diaphragm reducing distortion to incredibly low levels.