Sennheiser HD600 and Focal Spirit Professional. LCD2 are a bit too mellow and HD800 are too bright.
You listened to another pair other than mine? Mine was only hooked up to the 2A3 in the BA chassis and the 2A3 mkIV.
The ones at the top of my list to try - Spirit Classic, Slant, Enigma. The big Orthos I just find to be too heavy. My favorite headphone in terms of comfort remains the SR-007MK1 I used to have, but it was ultimately too polite for my tastes and I moved on.
I've been trying to find the most tonally balanced headphone myself. Among those mentioned, right now I have an HD600, DT250-250, HE6, Paradox, HP50, and something which I feel ought to be mentioned, the Sony MA900. They all sound good, but have some caveats:HD600: It's a little closed in sounding, lacks sub bass for some genres, and is generally unexciting. Pads need to be changed very often or the imaging can get muddy.DT250-250: Exactly the same as the HD600 but worse ^ It's also rolled off on both ends compared to something like the HE500. But then it's also closed and is extremely tough. Listening to it with a Vali alleviates the problems somewhat.HP50: There's a little bass emphasis, and the nasally characteristic gets in the way of clarity. However, it might be a selling point of these cans. They mentioned "room feel" in the marketing material, and it seems the honky sound is there to give an impression of more space(?) I think it's great, but I generally use it as a portable and never for serious listening.HE6: Etched treble. I don't think it's neutral. Sometimes the treble can get painfully sharp on contemporary pop stuff. I hardly use it because of my issues with the highs, but I think it's great for vocals. The presentation could also be wider.Paradox: What Dave said earlier. Re: the bass however, the Paradox does have bass if I press the cups in tighter. I'm currently experimenting with replacing the headband and pads for a tighter seal. The Paradox I think is the most neutral out of the headphones mentioned, except for a small issue with the highs that some people really don't like. It makes the HD600 and DT250-250 seem warm in comparison.MA900: Most comfortable headphone I've owned, and reasonably neutral (in the HD600 sense). It lacks lower bass impact even though the bass is there, probably because of the air gap between the drivers and the ear. I'm a little scared to bring it out of the house though. The highs are reasonably detailed but are a little soft. You can take a look at the FR on GEAgain, I like how all these headphones sound in general which is why I own them. I just wrote about the problems I have with them despite a lot of people calling them neutral.
Have you heard Nad Viso HP50? If yes, do you find them similar enough to Spirit Pro? Viso HP50 are easier to purchase here...
How would you compare the bass on the Float to other high end headphones? Does it sound similar to any HPs I'd know or is it completely different from the other electrostats?