I had long entertained the idea of purchasing a pair of multi-element headphones, and have come to realize that the one I purchased may be the only one of it's kind. Every other multi-driver earphone on the market that I have seen consists of two or more balanced armature drivers... and because of my experience with the Etymotic Hf5's I don't think much of that driver technology. Now I am looking for a pair of phones that use multiple dynamic drivers, not the sterile, bass-less, B.A.D. type. So far I have not found them, and find the bass, comfort, clarity, and uniqueness of my current pair of KDE's very satisfying.