This is for Georgehifi especially but others can chime in.

When I owned  a pair of Dyn C1s (not Platinum) I used a Simaudio i7 integrated. I listened to a T+A integrated at my dealer at the time, from the R series, along with a T+A cd player. To my ears the bass was taut but not as deep as the Dyns were capable of. The Simaudio i7 fed by my Supernova cd player gave better bass and overall presentation; weightier and fuller. The current model, 700i, has more power than the i7.
The C1s are a special speaker for their physical size. Hope you have many hours of delightful listening!

Thank you everyone for a spirited conversation. I follow these forums regularly and enjoy each of you. @keithr What preamp were you using?
   Simaudio 700 is an awesome match with the Dynaudio C1 and I should definitely consider it. 
  @audiotroy seem to get a bad rap on here. They are trying to sell gear but I take their enthusiasm as a love for the product. 

T+A was imported by Quartet marketing about 14 years ago. I have been carrying T+A Products since then. Yes T+A was also imported by Dynaudio for a few years because they showed together for a few years in Munich also.
T+A is brilliant stuff. If you're in Los Angeles, Come by and experience every product they make. Yes including their Mono Blocks too.

i found audio research pairs nicely with dynaudio (both their solid state and tube products). worth giving klaus at odyssey audio a call too - his amps can beautifully drive any speaker.