Can you describe the sound signature of the rs2e?
I am happy to try. These are my first real headphones, so am afraid I don't have a reference. (Apologize for the long reply)
A little background, I did spend a fair amount of time of messing around with home stereo. This was a bit in the past now, but I had messed with all kinds of amps (tube and SS), and a few speakers. I ended up selling off my higher-end (mid-fi, in reality), commercial amps and built a pair of Welborne Labs 300B monos, and moving to building single driver speakers. Tried quite a few drivers as well, mostly in the Fostex line-up. Finally moved to open baffles, which worked great with the drivers I was using (though they shouldn't have worked). From there, tried a Patek chip amp on a whim (see here: http://www.6moons.com/audioreviews/audiosector/patek_2.html, my amp is the one in the upper left, using one of the large block power supplies, as shown below), and that was it. As good as the 300Bs were, the chip amp was that much better
to me. Very deep, solid and controlled bass. Extended highs, but not remotely harsh, a tad laid back. Felt I could live with this for a long time, and ended up with a pair of very nice German-made Veravox drivers. (still have these pieces, just no room)
I'm only playing out of my HTC phone or MacBook Pro, listen while I'm working. I bought the phones lightly used, they weren't broken in. I wasn't sure about them at first, as the bass was lacking and the balance seemed off. But as I've broken them in, bass is coming in nicely, sound is balancing out. I do have to turn them up a bit to get the bass to come up, I'd imagine some of this is the amp just not having great control. Mids to seem a touch forward, but much less than I was expecting reading reviews of this model. I'm listening mainly to lossless, and some internet radio (some is better than others).
What I've realized is that if a song is well recorded, it's represented well. Bass is there, details are there. I remember bass being stronger with some of my music on my old home system mentioned above, but it's well represented and in all honesty, better than I thought it might be. Mids and highs are great, not shrill unless the recording is bad. I did play a tune the other day that was brutal. Top end is there and pleasant, if not a touch laid back.
I've listened to all types of music from rock and punk to jazz and classical. Really enjoy acoustic singer-song writer music when I can find it. I've even put on some bassy electronic to see how they would do (most recently, Mr Oizo, from the archives), and they sounded good. Not the huge pressure chamber I'd image you could get in a closed back, but it made me smile.
I'm enjoying these and hope this is helpful, enough rambling. My challenge now is trying to find an amp that will offer a similar sound to the Patek mentioned above. Something simple for the desktop (M-stage, Schiit, RSA,???), so if anyone has any thoughts, greatly appreciate it.