SRH1440 are open.
DT660 are closed.
So would you re-qualify that statement specific to that fundamental design difference?
And as an aside, do the DT660 isolate well?
The SRH1440 is more neutral than the SRH1840? I had the opposite impression... but I never compared them side to side.
Well, I have to tell you. I owned the SRH840 and had to sell them. Sounded OK... (like my M-50's, kinda), but they were un-wearable. One of the most uncomfortable headphones I've ever worn.
I've never tried the 940, but the headband design looks different...