Superb sound, nice, light and great quality.
I am quite pleased with these. My only complaint is that they don't have an inline volume control. The blue marble design is old & cheesey looking. As others have said Sennheisers fit tight but gradually become more comfortable. They are designed for home use which is why I purchased them. I compared these to several other sets of open phones. First was the Sennheiser 650's. As many said, they seem to have a veil that darkens the sound somewhat. The 600's do not. A positive and a negative: These really make all the instruments , especially when listening to classical. Each instrument stands out. Sometimes I just have to refocus on the whole composition. It has been over 6 months since i purchased these headphones so all my mental notes have somewhat faded. Still love them.
If you like music, especially instrumentals / vocals you will love these. If you have never had a solid pair of headphones, you will love these. I personally believe anyone who enjoys music, should have a pair of good headphones like these. I originally had a pair of vmoda mx-100 which are also pretty stellar, but the bass can be exhausting, and so can the heat buildup. I think of the hd600 like a classic timeless piece. not flashy but so solid everywhere to the point that it stands out. songs will sound different than you've heard them before. 2 things I don't love, the proprietary connectors to the headphone, and sometimes i notice the clamping strength on side of head, but definitely not a deal breaker.
The HD 600 Avantgarde are audiophile-quality, open dynamic hi-fi/professional stereo headphones. 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, DVD, MD and CD players. These headphones are an ideal choice for the professional recording engineer recording classical music.
Sophisticated design, elegantly finished in black and grey
High-quality, open metal mesh earpiece covers for an extremely transparent sound
Computer-optimised magnet systems minimise harmonic and intermodulation distortion
Extremely lightweight aluminium voice coils ensure excellent transient response
Neodymium ferrous magnet systems for optimum sensitivity and a wide dynamic range
Exceptionally natural, spatial and accurate sound
Detachable OFC copper cable, with very low handling noise