I have the 1.5's and have good sound with an Arcam Alpha 9 Int. amp. They compliment the 1.5's with rich, warm yet detailed sound. They do not play that loud and the amp shuts down if it works hard.
Better amplification for Thiel CS 1.5
A friend of mine sold me some Thiel CS 1.5 speakers earlier this summer (quite an improvement over my Infinity Reference speakers), and has started me down the audiophile path. I am currently running them with a Kenwood VR-407 5.1 receiver (5 X 100 w/ch @ 8 ohms), but I know these speakers can produce a better sound. I don't have very much money. Any recomendations would be welcome (I'd like to get Krell, Classe, or Rotel).