There is, the IM70. Said to have slightly boosted bass and overall more presence and power. There is also some metal in the bodywork of the IEM for the IM70.

I had the Radius DDM1 a few years ago, and yeah the treble was lacking, to the point where electric guitars sound dull. But everything else is wonderful, and the mids on that is definitely better, and the transition from mids to bass is excellent. This (IM50) isn't so recessed, but it struggles with getting it across. It's letting you know it's there, but not really doing everything it can at extracting details out in that sound region.

The dual symphonic drivers are quite different than ones in FXT90 or Radius. The Radius has the larger driver and smaller driver facing different direction and share the same magnet. The FXT90 has two tiny independent drivers but one is on top of the other. The IM50 has two independent drivers (from the looks of the diagram anyway) and they are placed in-line; one in front of the other facing the same direction. Probably the rear driver has a channel to deflect and direct sound around the front driver, I don't know.

But it somehow works.