what about fidelio s2 ? i want something under $150 , with well extended spectrum , nice bass with speed and some punch , good mids , and present highs with some sound stage , you can say something like ue600 but with more detail and a bit more bass .
im buying 2 , re-400 is all in , im getting it for sure , i just want one more . and it has to be available in usa .
The S2 has nice speed, but it doesn't have a huge lot when it comes to bass amount. It does have everything else, very clear mids, and sparkling highs, with a large soundstage due to it being semi-open.
It doesn't need an amp, but it scales very well with one.