I love the Harbeth speakers, do them some real justice and consider a McIntosh MA8950.
P.S. The MAC doesn’t care what speaker output taps you choose either, you can safely try 2,4,8 even though they are 6 ohms, doesn’t matter whatever sounds best to you! Also, I have owned my MAC amp since 2007 and never have i had to worry about it not working. And Yeah 200 watts a side is a lot of power,that’s the point, to make the Harbeth’s go from boxes playing really nice music, to real instruments in your listening room!
https://www.mcintoshlabs.com/products/integrated-amplifiers/MA8950
Matt M
Matt M