20 - 20??000 Hz frequency response</br>Semi closed back</br>Neodymium magnets with copper clad aluminum voice coils</br>Super thin 40mm diaphragm</br>Gold plated stereo</br></br>Product Description</br></br>The JTS HP-20 headphone features high quality semi closed-ear?? dynamic stereo powered by a beefy yet lightweight neodymium-ferrous rare earth magnet system with lightweight copper-clad aluminum voice coils. The adjustable frame allows for a comfortable fit and hours of wear without fatigue. The coiled cord is gold-plated mini stereo phone plug?? and a 1/4"one adaptor Super thin 40mm diaphragm drivers powered by the neodymium magnet a full range 20-20??000 Hz frequency response?? letting you hear all the highs and lows!</br><br/>http://www.amazon.com/gp/product/B007PQ7L2CSSP