zazex
Headphoneus Supremus
I disagree with der_Asiate and zazex.
I own the DT 1990 and the HD 650 (sorry, no experience with the HD 660, so I can't speak directly to that) and they offer vastly different listening experiences and are a complement to each other. Sometimes you want detail and treble, sometimes you want a smooth presentation.
Sound signature aside, though, the DT 1990 is head and shoulders above the HD 650, especially in dynamics and detail retrieval. Unless the HD 660 is similarly better than the HD 650, I think you may be a bit disappointed.
I think we're in agreement, more or less - you're praising the 1990 significantly higher than the 650 - "head and shoulders above" - which is pretty much what I was attempting
to get at in my post. You went for a quite expensive headphone, definitely pricier than the 650 (and even the 660S). And, in fact, you seem to find it very rewarding and
probably feel that although expensive, it was a good investment for you.
I was merely suggesting to@tsukuyomi that he do the same thing, just to a higher degree - depending, of course, on his interest and resources.