Are the M1570's an "easier listening", more musical set, would you say?
Certainly "softer". My testing list is 17 songs and about 1 and 1/4 hrs. long. I am going back and fourth. When the HE6se V2's are on my head, I am absolutely certain that they are the superior headphone by no small measure.
Then I put the M1570's on and everything feels and sounds good. Not as much punch, but very smooth. A very pleasant experience. I think I might be keeping both. Two different ways to do planar's and both are falling into my "really like" zone. If I HAD to get rid of one, it would be the M1570's.
But you have to compare three specs:
1) Sale prices of $399 VS $599
2) M1570's are kind of a loose, sloppy fit. Move your head sharply and they will fall off. The HE6se V2's are KILLING the top of my head and will require Dekoni Nuggets, which I already have. Hurts like the Cascades.
3) The biggie: amp pairing. You can of course play them on anything. But to get their best you are looking at close to the $1,000.00 mark, IMO.
The iFi Pro iCAN is exquisite, but that was like $1,799.00 new (and is now discontinued).
The LP and the Schiit Loki are almost there, but that was $599.00, plus shipping and $149.00, plus shipping. About $850.00ish (about $1,300.00Cdn.).