Originally Posted by gr8soundz
I was just thinking of the he-400 again.
From memory (if you can), did they have less clamp force than the PM-3?
Also, are the sound signatures similar except for the he-400's bass and soundstage (being open)?
clamping force was never a problem for me, but I have a small head. wear the he-400 on minimum setting and the pm-3 at 3 notches/side only. hard to say for other people, but comfort is not the old he-400's strength. I could wear them all day and adjusted to the weight, but there are definitely more comfy options out there. bearable & not too bad though esp with different earpad options (velour or focus pads). pm-3 are definitely much more comfortable than the he-400 overall due to weight differences.
sound signature is actually not similar. the following is based on audio memory so take w/ a grain of salt. he-400 has an unique coloration and more bass quantity compared to most other planars. hard for me to judge now actual amounts without a direct comparison, but going by memory I would say more bass emphasis, recessed upper mids, and treble spike. the he-400 will sound brighter and darker at the same time. unique frequency response a little bit kinda-u-shaped but not exactly. this is compared to the pm-3s or something else more in-line with neutral. compared to a lot of consumer-oriented headphones, the he-400 will still sound much cleaner due to it's tight presentation of notes. & they can be more neutral than a lot of consumer-oriented options out there. more bass reverb on the he-400 compared to other open headphones, but hard to say against a closed one like the pm-3. he-400 can get a bit bright, but really actually just dependent on the source and your overall set-up. didn't really have any treble problems for my sonic preferences when paired with a tube amp. sound stage is good for an open, but can find other open options with better sound stage in that price category like the q701 or k7xx. i greatly enjoyed the he-400 and loved it's bass quality and quantity (when I had a more bassheady sound sig preference). overall sound signature was quite enjoyable for me, but do want to note the slight coloration for people looking for neutral.
the he-400 would be my first recommendation for entry level open for bassheads or people who just want high quality bass with enough quantity to satisfy your appetite without being overdone. great for edm/hip hop/bass heavy tracks. jazz and pop is pretty good on them too. would personally find a different set if primarily listening to classical or acoustic.
hope these impressions are helpful & remember, audio memory so not as exact.