Fun fact:
I have no idea what any of that means. Though I figure someone spending that amount on IEMs would.
Female vocals - Women sing at higher pitch than men do. So these are tuned to where a female voice comes out louder than the standard.
Imaging - The location where various sounds come from. For example if you are listening to a live recording and imaging is good you can identify where everyone and everything is located and if say the singer is moving around during it.
Soundstage - How large in 3d space they can reproduce. Some headphones will make you feel like you are in an open concert hall, others will make you feel that everything is in a small room with you. Width is how wide to your left and right things are. Depth is forward and behind. So these have a narrow oval.
All together womens voices are louder compared to everything else than a balanced curve to the point it stands out. The soundstage doesn't extend far in front of you or behind you compared to your left and right. And they don't clearly identify where individual items are coming from.
That's not always a knock on things. IE soundstage matters a lot more for rock or orchestral music than it does for electronic or jazz. Imaging well... if it's techno it's a wash but for an opera or live recording it's huge. Female vocals also depends on the recording and track. It's just to be aware of. There's other tricks with IEMs like having a dynamic driver is great if you want your base to thump but it's not great if you want a neutral tone.
Hence the trick with the IEM game, really any audio, is to keep trying stuff or buying and selling it until you find what really works for your music.
