You are right I might've lost my reading comprehension regards to the different baffle designs and bass conduction. Got mixed up and didn't bother to go back enough to properly quote. But speaking personally, I'd leave the conduction behind. Have you listened to music that doesn't extend below 50Hz with and without the mod and made the conclusion? If it goes without saying that you have, I don't have anything against it. <50Hz is still overrated though, but I don't listen to much electronic music anyhow (and I would still be happy without the extreme extension) At most you get an atonal ambient rumble you don't even feel with headphones... No pitches of notes to distinguish = no musical value. Heh, I did not mean that as a condescending remark on people's musical tastes, though it may seem like it.
I appreciate the detailed and "non holistic" approach. It's just a shame that there is no context at all to how you've come to these conclusions (now talking about stuff unrelated to FR). In other words, what music were you actually listening to when coming to this and this conclusion etc.
Saying "bass is quick" or "handles quick passages well" is pretty holistic in my opinion, without the context of the recordings. Put some well recorder stuff through any reproduction setup, even fast tempo music, and it'll sound "good", generally put.
This is just me nitpicking though and find the lack of "real" context a problem with almost every review. I might just be naive though. I appreciate your approach as I said. What lead me to my irrational rant though, was that you said it already as stock extended beyond the level of a HE400, which to me already go as low as a headphone with ANY of my music can go. How does one go and improve that? I see great measurements of the HE400 extending very deep as well. As logical as we seek to be, this hobby just reeks of disproportional statements.
One more thing I'd like to add, is that of course it's in Fang's interest to listen to the public. But people jumping on the "NO DEEP BASS, THIS HEADPHONE IS FLAWED" -wagon is just too soon. I'd rather have a new product as it is and go improve on that based on a general opinion (preferably logical ones as yours) and then have it fixed as opposed to just listening to just one, no offense. I'm just extremely hesitant about this mod not having ANY acoustical effects on reproduction instead of the boost in sub bass (off course without any added distortion in any HD order figures).
Who's here to embarrass people? C'mon, this ain't a competition. Who am I to say as someone who hasn't really contributed anything substantial to this movement in headphones. You have more power and I acknowledge that.