This is pretty strange, I have the Dynaudio Spedial 25 and use the Belles 21A and reference 150A amp, though I primarily listen to my, also English, Nottingham Spacedeck. I have listened to the Harbeth as well and it is a wonderful speaker. Perhaps a bit more fullness and richness with the Dynaudio, the Harbeth maybe a little more midrange depth but to be honest I heard both in different environments and with different electronics. I also listen to the Harbeth M30 and perfered it's treble to the SHL5 though it did not have the range of the larger Harbeth. I think all are great speakers and will appeal to different people. I would strongly suggest trying to listen to them.