This full-size professional quality stereophone is the choice for broadcast and recording professionals whose careers demand reliable equipment and superior performance. The PRO4AA Titanium features dynamic elements for an exceptionally wide frequency response. Titanium coating on its diaphragms increases the rigidity of the element, minimizing mechanical distortion and ensuring exceedingly accurate sound reproduction. One-inch (25.4 mm) diameter oxygen-free copper voice coils improve signal transmission and conduction for cleaner, clearer sound. For times when every note must be captured and no sound allowed to leak through, closed Pneumalite cushions form a positive, comfortable seal around the ears, maximizing bass frequencies and isolating the listener from ambient noise.