The HD600s sound wide, open, spacious, and very extended at both frequency extremes. Being open-backed, there is a fair amount of high-frequency spill from these headphones, which makes them less than ideal in the studio when recording vocal overdubs, for instance. However, in general high-quality and reference monitoring applications this spill will be of less concern than the influence of external sound passing through to the listener. You really do need to use these headphones in a quiet environment — trying to assess sound quality while the same signal is blaring over loudspeakers is completely pointless!

If you're a particularly persnickety listener though, you may want to step up and shell out the extra cash for Sennheiser's HD 650s. Just remember that these are really intended for home listening--ideally when connected to a home stereo with a solid amplifier.

The HD600 are state-of-the-art headphones with high sound quality and remarkable value, among most of the offerings in today’s time.

Older-model headphones stick around because they perform their function and perform it well. The Sennheiser HD 600 is one of the most venerated headphones in the audiophile space over the last few decades for good reason: it's great.

Instruments and vocals are clear and crisp, and the open design gives these headphones a spacious soundstage. Bass is a little lacking, but they will accurately reproduce the detail in high-res audio, especially plugged into an amp.