The Sennheiser HD 600 is an audiophile quality open dynamic Hi-Fi/professional stereo headphone. The advanced diaphragm design eliminates standing waves in the diaphragm material. The HD 600 can be connected directly to Hi-Fi systems of the highest quality, in particular DAT, DCC and CD players. This headphone is an ideal choice for the professional recording engineer recording classical music.. | Sennheiser | | Refurbished Excellent | HD 600 Audiophile Dynamic Hi-Fi or Professional Stereo Headphone | Black | Best Buy