Check out the Dynaudio owners forum on the AVS website. I am a member of that forum and there are quite a few C1 owners in the forum.
I also own the 1.3 SEs and they are also powered by the Krell KAV 300il (same as 400xi). It has always been a fantastic combo. I think the C1 will be a substantial improvement but at quite a bit more cost. Still the 1.3 SE is one of the best monitors that I have ever heard south of $5000.00 The Krell seems to nearly a match made in heaven for the Dyns exhibiting excellent detail, clarity and control.
Best of wishes.
I also own the 1.3 SEs and they are also powered by the Krell KAV 300il (same as 400xi). It has always been a fantastic combo. I think the C1 will be a substantial improvement but at quite a bit more cost. Still the 1.3 SE is one of the best monitors that I have ever heard south of $5000.00 The Krell seems to nearly a match made in heaven for the Dyns exhibiting excellent detail, clarity and control.
Best of wishes.