You can put it in your guide. That should be more than enough publicity to get it started anyway.
If the phone is good it'll get known. I think the reason the HE-4 flew under the rader is that they're hard to drive. I don't think the HE-4 was ignored anymore than the HE-5LE was, They were both ignored. Haha. I think the first "hit" Hifiman had on their hands was the HE-500 and then it was the HE-400, because it was cheap and easily driven, not because it was necessarily better sounding than the HE-4. HE-6 had a slow following in the beginning which sort of grew and is now fairly big.
If the 400i sounds like the HE-500 and is in a cheaper lighter package. Trust me, it's going to be VERY POPULAR. Hell it'll be the #1 recommendation for under $500 period.
Edited by M-13 - 1/25/14 at 1:32pm