Hi @Wilfried - ok, I’ve managed to listen to the Nait 50 with the Martens for a couple of days. This is in a not very large room instead of the NC250. What can I say, the Nait 50 is still connected and enjoying the company it’s in, while I am enjoying the music!
It’s not showing any deficit at lower or normal listening levels, not getting warm or tired as well being connected with with as short as 2m ChordMusic speaker cables and proving confidently that the “higher” the company, the better it gets. Seems like it rewards with good components although as always one cannot quite be sure how the speaker partnering will work in every case. The Martens though, have been friendly to almost every good amp I’ve tried them with (e.g. the Nait 2 was an exception and may be it was the setup then as well)
Compared to the NC250 the Nait 50 sounds a bit more polite overall, less deep, slightly softer or less defined lower end … or so I thought initially haha. As I also have a couple of interconnects on trial, I also tried a Superlumina RCA to DIN and … OMG, I was not prepared for the sudden uplift and as if a high octane injection, so much more life and I even had to re-level the loudness by a few dB lower - exceptionally good match for this setup I thought - huge energy, rhythm and vibrancy. Curious to try the SL with my small speakers although I am thinking they may throw things a bit out of balance there?
I have a few other things things to try but so far a very impressive appearance of the Nait 50 on my centre stage! 
