There are dozens of reviews of K7XX here,and almost all of them mention the need for an above average amp for them.
There are also several members here who listen with their eyes,as opposed to their ears.
I am not debating you on what the specs tell you,I am simply a guy who used to have this combo and am reporting what I wrote above.
There is nothing wrong with either product,both are pretty good for their bang-for-the-buck value,but they simply dont sound great together.
See I would consider the Magni 2 above average power wise.
Now I also have heard the reviews that some say they don't work together...some do. All Im saying is I don't think the power is the issue here.