There is no such thing as uncolored. Everything has a sound. Even one piece of wire 4 inches long has a sound. Every Class D amp using the same module will have a different sound because everything matters. When the NC400 amp module came out a few years ago the Objectivists declared it perfect.....measured perfect, so must be great. I did a mod on them where I changed the polyester output filter caps to modified stacked polypropylene caps. It sounded much better. Here is a link to a thread where this is talked about....notice the resistance from those who have not heard it but "know" that this mod cannot make a difference.
https://www.audiocircle.com/index.php?topic=118868.0
So, was the amp "uncolored" before the mod or after it? Neither...just better sounding.
Mike (Mr. Mivera) has stated that his more expensive versions of his amp with the thicker chassis and better wire and jacks sound better than his less expensive ones. They will not measure any different. So, which is "uncolored". I A/Bed my new prototypes to Mikes amps and his amps sound very "colored" in comparison. So, does that make my amps "uncolored".......no, just less colored. There are and will be amps down the road that are even less colored than mine.
I have made a class A amp that has very little color. However, I do prefer the modded IceEdge. But, I am rebuilding the class A amp so it will be way, way better. Will I still prefer the class D? This game is never ending. There is no perfect anything. What you get with the latest tweaked modules is incredible sound for very little money. Tomorrow, they will be boat anchors.......he he......for a very tiny boat.