I have heard Thiel CS-7.2 and CS-6 with Spectral's higher power offerings and it is a wonderful match.
With the DMA-50 though, some of the comments above may be more relevant.
As a Dynaudio and Thiel dealer with familiarity of Spectral sound, I would think Dynaudio would be great with higher powered Spectral, but maybe not with lower powered work.