I just spent months studying headphones, reading reviews and getting to know them. I have a decent audiophile stereo with Adcom 555, NAD preamp, Focal Arial 926, Dual CS 5000 turntable and Denon CD player. I wanted to have headphones that are on the same level as my stereo. So I purchased the Focal Clear MG's and you can read my review on the other posts. They are very balanced. You hear a solid strong bass, great mid's and high's that are very even. I personally would prefer if there was a tad more treble response from these headphones. With not having strong high's like the
Beyerdynamic 1990's or Sennheiser 880's, the sound stage is not a big compared to the other two. While the others have a bigger sound stage including a more open top end, the mid's on those
Headphones are thinner than the Clear MG's. You also hear more sss when people sing with them. When I hear drum toms on the Clear's from Neil Pert, they are solid and have a good presence. On the 1990's and 880's they have a lighter sound and they are not as full sounding. The
Sennheiser 660S actually sound similar in character to the
Focal Clear MG's with the exception that the Clear's offer a little more detail information including the ability to hear the reverb tails better. I found the difference enough to warrant purchasing the Focal Clear's. Now my wife would say the 660S are excellent sounding headphones, why do you need something better that is more than twice the price? If your not on the level of noticing all the fine details, reverb tails and you just want to enjoy music, the 650's or 660's are good enough to have an enjoyable listening experience.
I don't think there is such a thing as the best headphones. Once you have balanced sounding headphones like the Clear's, you will then not have the sound stage and open top end of the 800'S headphones. Then on the 800's headphones you get all the separation and clarity but then the mids sound thinner, and the bass is not as strong as the Clears. Serious audiophile headphone fans seem to have more than one pair of headphones as with some music one pair of headphones will provide you with more of what your looking for.