OK, have had a chance to get some more ear time with the EDC3 and the Pinnacle PX. Impressions are:
The PX has a slight mid bass hump compared to the EDC3, so drums and the like tend to have a bit more snap when hit. Bass on both are still very similar and polite but the PX has a bit more bass 'rumble' over the EDC3. However, after 100hz the PX starts to fall all the way to 2k hz (by quite a bit) whereas the EDC3 stays flat all the way to almost 1k hz and sees a slight rise before it peaks at 2.5k hz .
Due to this, the vocals on the PX sound pulled back where the EDC3 sounds more in your face. By comparison, the PX has an odd texture to vocals that I never really noticed until now. And honestly, unless I was swapping back and forth I would have never noticed that they sound thinner and grainy compared to the silky smooth vocals of the EDC3. They don't sound bad per se, just different and I assume one may be preferred depending on genre of music.
The big difference between the two comes to the high end. The PX has a pretty large bump from 2k-6khz before falling off. all the way to 10k hz, The EDC3 on the other hand, falls a bit to 5k hz, and has a few slight bumps until 10k hz. By comparison, the EDC3 is notably darker sounding. But, the PX has more hints of sibilance on T and S. It isn't the worst I've heard and isn't on every song, but between comparing the two it became more noticeable. The EDC3 has no instances of sibilance at all and stays polite although its high end is smoothed out. But, for classical and jazz, the PX is the clear winner due to it's higher amount of treble energy which gives those tracks more life. Overall, I would say the PX is the better player at classical, jazz, acoustic, etc. due to the pulled-back vocal, slight mid-bass hump, and that big hump in the high end.
The EDC3 however would be better suited to to rock, RnB, pop, hip-hop, etc. as the vocals just sound great, clear, and in your face. It may lack the bass impact for some songs but it's passable and still audible although lacking that 'slam'. While it doesn't sound as good as the PX for its listed genres, they still sound pretty good. Really, there wasn't a genre that sounds bad on the EDC except maybe classical and jazz due to them sounding so dark although they do have good clarity.
Imaging for both were good and but the PX may have the larger soundstage due to how the vocals come off. It's slight, but the PX generally sounded bigger. The EDC3 always seemed vocal-centric as if you're front row and looking right at the singer. Neither are bad, just really depends on preference and musical choices.
I thoroughly enjoy both so choosing one will really depend on musical taste. I will note the ergonomics of the EDC3 are vastly superior due to shape and weight but the PX has the option of being worn down if you prefer. The PX also has the nicer cable. It is pleasantly thick and just feels very well constructed.