That's a good percent. Do you find the song shouty at all overall? I feel Etys wouldn't be bad with ambient in general since a lot of the resonances come from lower mids which are relatively deemphasized.
I should say more like 30% safely as not to disappoint you. I can't gauge it exactly but it's sort of in between background and present, just a bit behind the rest of the music in terms of focus. The point is that I'm not searching for it, it's not veiled imo; it's clear and felt just enough. But if you're used to stuff like that being the most forward part then the SR is not that headphone. Luckily if you wish to try it you can always return it!
Ety's in general might be a bit shoutier than most headphones, but everything I've heard sounds pretty natural. I wouldn't call the SR shouty, but again more than most headhones. And really, I'd rather a shouty sound than V-shaped which can sometimes suffocate the music, but that's just my bias especially since I'm tied to my HD 201, the king of shoutiness (just look up the freq chart on innerfidelity).
I'm kind of inexperienced with high end headphones so my idea of headphone balance isn't well defined, but all frequencies seem really well balanced, like nothing really stands out like a sore thumb. There's may be a tiny bit much mid transparency here and there as dentreviews said in his review, but it isn't obvious and can only be pleasant which is a plus imo. It's kind of weird because I don't think this exact type of mid transparency sounds super natural (even though the whole mid range is more natural than 90%+ all headphones on the market, so this is more a comparison to the ER4S and real life than other headphones, lmao), but again it's really pleasing. I'd usually take the transparency over the precise bite of the ER4S, even though that quality gives the ER4S a really uniquely detailed and real sound. The ER4S gives guitars and instruments in general a nice texture, but sometimes the treble overall just feels a bit much.
So far I'd say if you want a more analytical but not shrill approach to electronic or ambient, I couldn't knock the SR. I think it does bass and mid detail dynamics splendidly; probably better than any headphone I've heard. But it might not be punchy enough, even though there
is punch, just not a high level.
What the ER4s in general have done to me is implanted this desire to reach the perfectly natural sound which is pretty much conceptual when it comes to headphones. Some have come close but not quite. So when I nit pick at whatever part of the freq response its like, not even close to as a big of a deal as the flaws in other headphones. The Sennheiser IE6 for example, is waaay too bassy and then sibilant at 6 KHz to boot.