Originally Posted by TheWhiteRabbit
I don't know. If all those things are really true it seems like the HD600 is scientifically the better headphones and is superior to the HD650 where it matters. Seems like the 650's are the wimpier headphone. If that's the case I'll take the 600's.
However, when people say the 650 does everything the 600 does with a fuller sound I think then how can the 650 not be better than the 600?
Because it is all a matter of presentation and personal preference. The hd650 have a very similar response to the hd600 but with a little less treble. What does that do to the sound? It makes the other frequencies sound more prominent. If everything under the treble is a little more prominent it will sound "fuller" in the fact that they have more low frequencies. That doesn't make them more accurate. A lot of people prefer this. Even I like a "full" headphone. Sometimes it is easier to listen to on certain music where the treble can be harsh or annoying. However, the hd600 will be representing the music closer to how it was recorded.
Let me stress that the difference between the two is pretty small when you consider the difference between either of them and any other headphones. I think you'd be happy with either if you like the sound. But I prefer the more accurate treble. Chimes, cymbals, snares, strings, etc. will all have a little bit more air and clarity. Check out these graphs for a comparison. The sound is pretty much what it looks like in the case of these two sets:
Now look at the green line, that is essentially what their interpretation of "flat" should be. The low bass on both is pretty much identical. The mids are a little lower on the hd600, but again, closer to the reference line being flatter. But look at the treble. The hd600 is pretty much flat up to 18khz. Even around 4khz the hd650 starts becoming less "reference" in flatness. Also the difference in the mids is less than the difference in the treble. I find that if there were one thing either of these could do to be more perfect, it would be to ever so slightly low the mid bass. But as it is the treble helps the hd600 sound less mid bass prominent.
Basically, you have a flatter more open sound (slightly) or a warmer more full sound. The 600 is "technically" a tad bit more accurate. That doesn't mean everyone will think it sounds better though.