I've lived with a Mcintosh 275 and C1 for the better part of a year, I would say the 275 drove the Dynaudio adequately in terms of dynamics and bass but ideally I think the c1 really does need double that, around 150 watts> to really start cooking, I replaced the c1's lately with larger more sensitive speakers and you can really hear the difference in the dynamics, loudness.
Soundwise, tonality and timbre were pretty wonderful, imaging was great too, I think ideal would be two in monoblock configuration to drive the c1.
Soundwise, tonality and timbre were pretty wonderful, imaging was great too, I think ideal would be two in monoblock configuration to drive the c1.