Typical HiFi Showroom sound will often be called "exciting" at first listen, but can quickly become tiresome. Boosted HF and LF. The boosted HF particularly will give an extremely "detailed" sound, but it's false detail: a frequency response boost will make certain things stand out. This is obvious.
What's less obvious is that nominally-flat speakers can be "detailed", in that their nonlinear distortion (harmonic, IMD - anything not present in the original signal) is low, so the "noise floor" is also low. ie, you can listen into a recording and hear things going on 20-30dB down.
This isn't possible with a cheap Bluetooth speaker operating at 5% THD - there's too much mush which masks the low-level detail within the recording.
To address the question more directly, I'd say a sensible frequency response, extended LF and a large dynamic range available. Something that can do "punch" when called upon.
The last system I built that did that really well was a Faital 18XL1800 and a BMS 4592 per side. Tri-amped with a few kilowatts on-tap. Good fun.
With regards to the Neumanns, I haven't heard them. I suspect the relatively linear response would be unexciting for someone used to the Typical HiFi Showroom Sound.
Chris