The Future of Audio Amplification

Hello tweak1
No, its not the MKII.
I bought it just a few days before the MKII was released because I didnt know! Colin didnt tell me that, otherwise I would have wait for the MKII. 
Nevertheless, this model sounds "superb" with the Sonic Imagery Op Amps. 
To have an idea, Hulgich Audio, an australian speaker factory, won the best sounding stand award on 2017, and second best on 2018, on a HiFi Show in Australia, competing against systems that costed hundreds of thousands and the amps used on those shows where Nord One UP NC500DM Monoblocks. My opinion is that you cant go wrong with the MKII.

Hello guys
I think the thread has gone to technical for me. 
Im not an expert, but I've tried some class A amps, SS and tubes, and now Im trying a Nord One UP NC500DM class D amp, wich has just replaced my previous beloved Line Magnetic LM-508IA class A valve amp (single ended 300B), wich had a VERY good reputation among audiophiles. 
Using both as power amps with the exact same system (a pretty revealing one) I must confess that Im blown away by the superior perfomance on "every" field the class D amp has against the 300B class A valve amp.
On every field Im not Just referring only to grip, dinamics and holographic sound, but also on some fields I thought were the 300B amp strengths like warm, delicacy, tone and texture. 
I still cannot believe the outstanding perfomance of this Great class D amp, even its not burned in yet as it only has about 30 to 40 hours playing and it should get "much" better. 
Its incredible! It cost less than a half, weights about 30 kg less, produces considerable less heat and I dont need to spend on valves ever again.
I was a valve amp lover, but now I found a much better and cheaper solución for my system.
To believe or not to believe. 

Well, thats something you have to think and decide on your own.
It will be difficult for me to sell my previous 300B valve amp because its an expensive one and in my country (Argentina) there arent many people that can buy it, but I dont care much because, even selling it at a very low price, I should recover the money I spent on the Nord. And Im not even considering the replacement valves I have in stock and I also have to sell.
But everything is now less importante considering that I have now a much better sound, less heat, less energy consumption, a smaller and lighter amp and I wont have to spend on valves ever again. 
Is up to you and your circumstances. 

hello brotw 
Sorry for the late response, this thread has come to large and techincal. I find it hard to follow.
Well, my Nord NC500 One UP is just burning, but even out of the cage it sounded better than the LM508, to my ears and in my system.
I also have to say that the Nord only has about 30 hs of use and it has a long way to go before reaching its best. Nevertheless, during this period I know it will sound sometimes better and sometimes worst. For instance, I found it yestarday a "little bit" thin and harsh, more than at the beginning. I'm sure that it will get warmer and more delicate with time, as it happened with other owners.
I also have to say that I really like my LM508 and I would like to compare both amps again, once the Nord has settled down, in a few weeks. But I also have to mention that I was expecting subtle differences, if any, but I found out noticeable ones, mostly in texture, noise and 3D image.
FInally, I don't think Digital Room Correction has something to do with the amp and the speakers. For me it makes the sound much transparent and plus I have the option to set it to my taste, rising some frequencies and lowering others.