Pioneer se ch9t earphones with detachable cable brass and aluminium construction push mobile hi res audio to the limit introducing the se ch9t from pioneer a premium dynamic headphone delivering immersive hi res audio in comfort original drivers developed for hi res audio reproduce frequencies between 5 hz 50 khz allowing the true harmonic character of audible sound to be reproduced while restoring a sense of spaciousness to your music airflow control port assists by separating mid and lo