I was considering buying hd650 (again). I own lcd2 and hd800, also wanted to see how q701 and k712 compare (I had q701, was really happy with them, sounded very very similar to hd800, gifted them to friend cause I couldn't stand the bumps. Also as far as I can tell, 712 are the only ones of the lot that have no bumps). So I did these comparisons using headroom's raw response only, to kind-of see the general tonality and what to aim for when trying EQ's. I superimposed the Harman's curve on top of these so you can see how these measurements compare against it. As far as I can see, they are kind of similar to Tyll's. Also added some beats and apple buds in the mix. I use re400, rha ma750 and custom modded bt 4.40 (will post pics etc) for on the go, a friend compared the re400 with apple buds, and said that the buds have better bass (though we agreed that there's no real comparison in clarity and general quality). hmm. So far, I really don't like the Harman's curve bass boost. I think I perfer hd800's diffuse field tonality with some reduction in 6khz energy for classical and environmental stuff, and lcd2 for everything else (kind of like harman but with linear bass). Stax SR-l700 apparently measures weird but that thing is amazing.