Well... I got my DBA-02s in today. People say you should spend some time with a headphone/earphone in order to get to know it better, but I don't particularly like to subscribe by that policy. Your brain can only do so much adjusting to the sound, and when I listen to headphoens I usually do it fresh - that is, not having listened to other headphones for maybe an hour or two before the demo. This usually happens because I get new headphones in the morning, so I don't really have time for headphone listening (which is usually late at night).
First, the good - I *LOVE* the mids. They have the same kind of analytical detail that I like in the iM716s, and presumably other Etymotics. It's not too warm or fleshed out, but it's not recessed - I guess they would best be described as "dry". The DBA-02 is a very very quick headphone, and that applies to the mids as well. Compared to the IE8 and the RE262, the DBA-02 is like a Lotus Elise compared to... say, a Ford F150 (powerful, but a little slow) and a Lexus RX350 (nice and luxurious) (sorry, I don't really know too much about cars). The DBA-02 has so much detail and is so fast you hear everything through a microscope. The bass is tight and textured, and the treble is possibly even more detailed than the mids.
But now, the bad... granted, I am coming from the IE8 and lately, some testing with notable bass-heavy closed full-size sets (DT770/80, M50, SRH750DJ), but the DBA-02s just don't seem to have any bass. It may be tight, but it becomes a problem when I try to listen for bass extension and can't pick it out. I don't really care if the bass isn't bloomy and powerful, I just like to hear the texture behind the rhythm bass and kick drums. That isn't really happening... and a lot of it has to do with the treble. People weren't kidding when they said the DBA-02 was a relatively bright headphone. It has great extension, and cymbals sound much more realistic than what every other IEM I've listened to (and many full-size sets) can do, but it's the quantity that's the problem. Most notably, there seems to be a peak between around 6kHz-8kHz (or somewhere around there), making crash cymbals sound bright - but not on the shimmer, which a lot of other treble-heavy sets do, but rather on the initial hit. This might be due to the super-fast decay of the DBA-02, but nevertheless it's still a little bothersome. The treble brings all the cymbals out to the front, so that you can hear every hi-hat, ride cymbal, even the snares. I'm trying really hard to block out the cymbal attack noise, even after half an hour of listening (which is usually about when my brain starts to kick in the habituation) and it's just not going away.
Since I've only had about half an hour total, one pair of tips (although the biflanges and hybrids I got don't seal with my ears at all), and one "listening session" I will not go into further detail. I plan on keeping the DBA-02 at least until the CC51 comes in later this week, so I can do a direct comparison, but it's not looking good so far. I really want to like the DBA-02, I really do - it's nice and small, has a great form factor, has an awesome cable, and looks great - and the detail is to die for. Maybe if I can find foam tips that fit...