Hi guys, I received the B400 on Wednesday and only had a couple occasions to try them so far. Yesterday I let them do some burn-in all day long with pink noise. I can only offer some initial impressions, so please don't take this post as anything more than a quick tryout of the B400 - and entirely personal, of course.
I've only tried the B400 with the pre-mounted medium silicone tip.
Honestly, at a first hearing, I'm not very impressed. The B400 sounded a bit harsh and metallic at first. When I pushed it deeper into my ears, the sound became smoother and fuller, but this kind of insertion is a bit deeper than I hoped would be enough to fully appreciate the B400's sound.
For my taste, the B400 is anything but bass-heavy. I find it extremely vocal-centric, with a rolloff in the highs that prevents it from being sibilant or piercing, but also tames the cymbals and snare drums almost to the point of taking away their snap. Not a dull sound, but not very energetic either. The overall sound signature is a bit dry. Vocals are prominent and very upfront, but kind of cold.
I read some opinions about the B400's supposedly outstanding spacing ability. Instruments are very defined and separate, but I don't find the overall soundstage particularly expansive - none of this "multidimensional" imaging someone wrote about. Resolution is definitely good; as for speed, the B400 certainly isn't the quickest IEM I've tried.
All of this may be due to the earphone being new, or the tips not being optimal for my ear canals. I don't really want to use the other included tips though, because I may still want to return the B400. As for foam tips, I've never been a fan of those, due to longer insertion time and the fact that they usually tend to make IEMs sound a bit muffled and darker.
Finally, I do have a gripe with the cable. I don't understand the "memory" portion of the cable: it doesn't seem very pliable, and I can't find a way to bend it to an ideal position. Also, the cable doesn't have a slider, and this, together with the "memory" portion, makes the B400 a little uncomfortable to wear from behind the head as I usually do with IEMs.