Sennheiser IE 400 Pro - neroThe IE 400 PRO's in ear monitor sound delivers a noticeable punch, clear treble and transparent mid range. Even at high sound pressure levels, the IE 400 PRO reproduces its warm sound without artifacts or distortion. With The newly developed TrueResponse technology allows the 7 mm small dynamic driver to unfold an enormous resolution and avoids acoustic stress even during long use: The otherwise frequently occurring distortions, superimposed