i would like to give my two cents about Yincrow RW-2000, at least in this soundstage regard.I'm trying to figure out if what I like so much about the OH Nightingale is related to staging, imaging, and layering or if it's simply highly detailed, tonally accurate, and distortion-free treble. Any song recommendations would be welcome, as I can't tell for sure with most of the songs I listen too. I have a feeling it's a combination of the former since the sound signature of the Nightingale is similar to the RW2K which is on Woody's stagehead list but I want to be more confident before diving off the deep end (Toneking Green Mamba... yeah...).
I have made a post in the past about being hyped for getting them, as they were featured in Woody's earbud timeline under the Earbud's for StageHeads, though i never have updated about what i thought of its stage.
There's a openess to the stage of the RW-2000, it has (nearly) enough of all dimensions in my opinion, but is not as wide as some buds, though it has more depth than lots of them, still not enough for me to say it has enough depth though. In genral i think it has the most 3D-like stage of all store bought earbuds i had till present date (that statement was taken from memory, as i had not listened to any other store bought buds from a while, with the exception of the ones featured in this post).
DB1E is wider, and sounds more open, in some musics also more tall, but has less stage depth than RW-2000. As separation and positioning are better in DB1E, i generally use it for stage purposes instead of the previously mentioned, unless I need/want stage depth.
I don't think RW-2000 has the most impressive soundstage, but i think it is very good, and at the second place, after DB1E, that's on the first place. But it is very likely a preference matter.
In conclusion i would say that RW-2000 is warm, and a much more 'fun' bud, which sounds much, much more pleasing than DB1E, that is brighter and tinnier.
Now about your post:
I don't have the OpenHeart Nightingale, but by your descriptions of it, it seems that it is kind of v-shaped. So, if i am not not misunderstanding, i would like to point out that the Yincrow RW-2000 is warm, and have treble roll-off, or maybe just 'a lack of eventfulness in treble' (at least to me), so it may not be exactly what are you looking for. As for the Green Mamba its said that they are treble cannons with not much bass, so if you are looking for something bassy, maybe that's not the bud.
Song recomendations for imaging, layering and staging? Well, i generally use 'Yosi Horikawa - Letter' for everything above and 'Chico Buarque - Contrução' mainly for staging and timbre.
By the way, could you provide a link to OH nightingale?