These headphones are engineered for the true audiophile. Thanks to an open circumaural design, computer optimized magnets and aluminum voice coils, you won't find cleaner, crisper stereo sound anywhere. The Hd 600 is an audiophile-grade open dynamic hi-fi/professional stereo headphone. The advanced diaphragm design eliminates standing waves resulting in a clean sound free of artifacts and acoustical disturbances. The Hd 600 is a fantastic addition to a hi-fi stack or dedicated listening room.