I finally checked out the B-100 that was included with my H-100 order ((single BA IEM that was included for free). I've spent about an hour with it and the B-100 is surprisingly good & usable. Sure, it looks a little cheap with the white housing and tacky colored ring.. but the sound quality more than makes up for it. It's signature is smooth, slightly warm but mostly neutral.. listening to it was very pleasing & inviting to my ears. I was reminded of the A161p & Fischer Audio Tandem signatures.
Bass is smooth & gently enhanced with no specific region getting a prominent boost.. it sticks to a mostly linear profile. Bassheads need not apply. No midbass hump, no sharp roll off in the sub bass. Just a gentle lift to give the sound a delicate sense of warmth & richness. Mids are clean, airy, neutral (with a pinch of warmth & forwardness), and possessing a slightly dry tone.. timbre, detail, imaging, & dynamic range is good. Treble is, again, smooth & detailed. Fatigue is a non-issue.. but it isn't sleepy or too laid back either.. it's presence is balanced very well with the bass and treble. Just the right sparkle and air here.. but it's well controlled and accurate. The B-100 seems to have a wider soundstage than the A161p (depth is probably the same). It's really well proportioned and doesn't feel constrained or stuffy. The tuning sounds impressively even and cohesive. It's not going to be the last word in transparency, detail, or black background.. but considering it was included as a free item.. it's impressively competent.