Thankyou for sharing your thoughts on this. Yes the KH120's are really good monitors already. Yes the KH150's are a potential option but after doing some more research these seem to be more suited to mid-field monitoring? I think I would possibly lean more towards the KH120ii's due to the size of my space.
Yes, true, but KH150 can be used at moderate levels as a nearfield too.
I don't think there is a real gap between the "old" KH 120 and the new KH120II. Just a few hz and Db more in the bass and calibration. IMO, and especially at very short distance like you do, it's not worth the change and the expense.
Calibration is far from being night and day, especially at very short distance, as i wrote before. I experienced it (not for mixing, but for listening)
And you can use an external competent cal software for much cheaper than a new set of speakers plus MA1.
And like many, I've heard about more bugs or reliability problems on the new Neumanns (that's not dramatic, risk zero never exists and Neumann is always a serious company, but electronics made of Dsp and very compact cladd D amps add complexity and sometimes temperature issues).
I think Neumann will solve this promptly, maybe it already has done it, but in any industries (audio/video, other electronic industries, cars, etc.) this digital complexity is a proven fact.
Analog filtering isn't the best theorical solution, but it always works fine and the technology is mastered by good makers since a very long time.
So, IMO, or you stay like you are (frankly, your system's not bad at all) or you jump to the KH150.