Well, there is a new challenger in town. One that equals the timbre of the FX700 with less bass and more forward mids>>>> The JVC FXT90. Listening to my favorite jazz album with strings, Tom Harrell's "Paradise," and this is nearly on par with how great I remember the FX700 sounding (but better to me with the more forward mids). Very nice full robust sound with the violins and cellos. These IEMs also does great on electric and acoustic guitars. Now, I've only have like about five or six hours playing time on them and I'm being blown away. And those of you who know me well in head-fi know I'm a staunch believer in burn-in. Well, not much burn-in on this JVC yet, and I'm already like wild! Yes, these are the dual driver carbon dynamic drivers (incased in some type of metal brackets but I forget what metal they are using). At about $130 shipped, these are equalling the GR07 and 7550 for me in enjoyment, but surpassing both handily within the strings section. Also, some of the best IEMs I've ever heard in reproducing brass instruments. The GR07, however, still does it for me with drums, but these are close.