Holly crap, why didn't I buy Havi B3 Pro I earlier?!? Just listening to these out of the box right now, and grinning from one ear to the other. Very detailed sound, AMAZING sound stage. NO need for amp driving it from AP100, though that DAP has a strong internal amp to begin with. Regarding bass, it's there in a perfect quality and above average quantity but it's not on the same level as mid-bass punch of KC06A or sub-bass of VSD3S. It's either me getting older and re-evaluating my listening habits, or after recent review of HP150, but I'm shifting away from commercial v-shaped or bass-head IEMs/phones.
Btw, listening to B3ProI with included large hybrid tips (the best balance between bass and mids/treble due to smaller diameter bore opening and longer hybrid stem) with only 10min of burn in time - and I'm loving it!!! Works both with wire down and up, but in-ear fitment better with wire up. Need to burn in more before final assessment since I'm not sure if bass will settle down and upper mids/treble will get brighter and/or smoother, etc. So far these sound closer to balanced-neutral signature due to a noticeable bass impact (though not in a big quantity, but great quality) and neutral/reference like highs. RE400 sounds veiled in comparison to Havis, not as much details in upper mids/treble and more neutral bass. Will burn in more and come back with more impressions later. I didn't even get to amping it, and I can tell for sure it will improve the details
Oh, and TT1E is next on the list to test.