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The LCD-2's are more than a little better sound quality they are in a different league than the 650's and shouldn't even be on this thread....
Just to put it out there - not everyone agrees with this statement. There are a lot of things the LCD-2's do very very well, but their treble roll-off is not for everyone and should not be disregarded. I would argue there are at least some ways in which the humble 650's outperform the LCD-2's, as noted below.
I'll copy and paste in my comments from the HD800 v. LCD-2 thread in which the enthusiastic LCD-2 fans have been hyping the HD800's "6khz peak" - arguing that the LCD-2's must be deemed the more "natural" sounding headphone. I strongly disagree with this conclusion.
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A peak at 6khz is basically irrelevant to anything but overtones if you are listening to recordings of vocals and natural instruments. (See:
http://www.listenhear.co.uk/general_acoustics.htm ) Violins cut off, on the high end around 3.5khz - and even piccolos only extend to around 5khz. A serious spike sub-4khz (see Beyer's DT880s) *might* be a real factor with respect to fatigue and treble balance, but peaks at 5khz and beyond do not matter in terms of
core frequencies (unless you listening to a lot of recordings featuring the highest pitched pipes on a pipe organ).
The 6khz peak will impact overtones - which are the bases on which we perceive tone/timbre and distinguish between one instrument/voice and another. However, my perspective is that the serious dip in the LCD-2's curve (as much as 15db!), at 6-8khz (depending on whether you're looking at the higher or lower amplitude curve), likely causes just a much, if not more, alteration/degradation in tone as the HD800's peak at 6khz.
I don't own the LCD-2's (so you may write me off on that basis), but I recently spent about 45 minutes critically listening to them in a silent room while trying to make a final decision as to whether or not to buy them. They are great phones that do a whole lot of things right, but for me, the tone and texture of violins was not one of those things. I attribute this (correctly or incorrectly) to their treble roll-off. For example, in Chanticleer's superb recording "Evening Prayer - Purcell Anthems & Sacred Songs" the violins simply sounded a bit too smooth to be real. To my ears, the textured and subtle bite of their highs just wasn't there. I absolutely love the LCD-2's for rock, but in the classical realm and even with some bluegrass, my conclusion was that my HD650's (v2) (to say nothing of the HD800's) actually give a more honest, textured presentation of strings than the much loved Audeze's. For live music recorded in large spaces (i.e. cathedrals) the perceived sound stage of the LCD-2's is also quite a let down.