Ericp10, thanks for your comparison to the HJE900s. You've asked a good question why I'm comparing a $100 IEM to a $350 IEM. There are a number of reasons. The primary goal was to see how close a state of the art dynamic might be to approaching a multi-driver balanced armature, or even a dynamic driver purchased at a much higher price point. Flavio's premise at the start of this thread was that the SE215 will shake up the $100 dollar market. In my opinion, he's right in that the SE215s are better than my UE700s, and marginally better than my MTPCs (almost a toss up). Still, the comparison showed they're not what I would consider close to the W3s or the SM3s. Additionally, I had read very little about the SE215s before purchasing them and starting the comparisons, so I'm hoping my impressions are unbiased compared to what they might have been with a lot of research before the purchase.
I've been a bit disappointed with my dynamic driver IEM explorations. I started with the Monster Turbines, but returned them. The IE8s are just too bloated in the lower end for my tastes, though I kept these for reference. I was going to write a comparison of the SE215s to the IE8s, but after some quick listening to the IE8s, I decided there wasn't any point. Similarly, I wrote a comparison of the W3s to the IE8s a year back but never posted it since it was just too negative on the IE8s, and I know a lot of people like them. I found the MTPC and MTPG to be a step up in the dynamic driver department. I'm happy to find the SE215s an incremental improvement on top of those.
I'm sure there are better dynamic IEMs out there--I just haven't tried them yet.
One last point, it would be great if an IEM company took cost reduction with improved functionality as seriously as the electronics industry focuses on ever higher levels of integration and performance at lower costs. With the market for IEMs growing, more automated production techniques should be able to produce higher performance at lower prices. It would be nice to see IEMs following a "Moore's Law" of their own. Look at the complexity of a hard disk drive compared to the complexity of the balanced armature drivers in an IEM. The drivers are far less complex, yet cost more. My netbook cost $350 with 2Gb of RAM and 250GB of hard drive space, roughly 20-30 billion transistors, multilayer PCBs, LED lit display, WiFi, BlueTooth, USB, VGA, graphics, an operating system, etc. Many of the components use a 45nm process requiring 3 billion dollar wafer fabs. My SM3s cost $350 with 6 balanced armature drivers, some resistor and capacitors. There are about 5 billion cell phone subscribers world wide, with each cell phone mostly capable of playing some music. The high volume market is there.