I've heard of people taking the filter out of their SM3s to get more treble. I haven't done it myself though.
That said, the J-Phonics sound like they'd be more transparent than the SM3s
J-Phonic K2 SP/MX head-fi club.
-Shigzeo : SP?
-ClieOS : SP?
-TMMC : SP?
-Tone Seeker : SP
-dogears : MX
-Kiteki : SP?
You'll get that with the k2 SP, but I kept the Earsonics SM3. I didn't like the W4.
FWIW -- I haven't personally heard the j-phonic K2 SP vs MX head-to-head, but Taka from Sensaphonics Japan informs me that roughly 75-80% of customers prefer the SP version, which is modeled on the reference-flat response of the Sensaphonics 2X-S and 2MAX customs.
Yes, I have the SP now. (skeleton shell btw).
I noticed these don't have a filter at all, that's interesting.
The small pelican case is very nice looking and professional.
No comments on the sound yet, Etymotic raped my ears, and I have a small cold.
I need to get over my cold and have fresh ears, it's like wearing a really strong perfume (Etymotic) and then trying a different one, it just won't smell like it's supposed to.
Interesting comparison to a Stax headphone, I'll keep that in mind when I listen to them.
I think high volumes make them sound pretty bright.