Cord length is another often-overlooked feature. At a solid ten feet, you are free to walk around the room and remain unrestricted.

Unfortunately, one vice to having extra long cord is that is can degrade sound quality. While this is a limitation of the laws of physics, Sennheiser has done everything possible to ensure that audio fidelity remains at a maximum. The cord is made of special OFC (Oxygen Free Copper), which ensures linear, low-loss transmission over a wide frequency. It is reinforced with Kevlar fibers and is fully detachable to eliminate any chance of tearing if it gets stepped on.

The output from the Sennheisers is very dependant on your audio source. Using the HD 600s with a top-of-the-line home theater system will deliver you professional sounding audio, however using the HD 600s with a SB16 will do no justice to the headphones.

As you have seen from the specs, the HF 600s go above and below the human threshold for hearing, meaning that the sound from them is very accurately reproduced. The highs are very crisp and sharp, without the brightness that can cause fatigue. Lows were handled very realistically, but aren't as powerful as what one would get from a subwoofer. In comparison to Sennheiser's HD 580s, I found the bass response to be better defined and more tolerant.

Different styles of music stress different aspects of audio. Classical music tends to stress bass reflex (ever bought a classical CD that actually had a disclaimer? That's a good sign you'd better be careful), while pop tends to emphasize mid and high range.

There are specific passages in the soundtrack that have bass drops, which are highly detrimental to most home theater systems. The HD 600s take them in stride, delivering a bass response that is clear, undistorted and, while not exceptionally gripping, is definitely impressive.