@dsper,
Keep in mind that the Thiel specs at 87dB/2.8V/1M which is confusingly not the same as 1 Watt. Considering the 4 Ohm nominal impedance, it's more like <84dB sensitivity. Jim Thiel told me that his power recommendations were based upon the assumption that quality ss amp that could appropriately double down be used and that for example that if one using a Thiel speaker with a 4 Ohm rating with a tube amp one should double the power of those recommendations. Furthermore, the c-j specs seem quite generous:
lp66s2man.pdf (conradjohnson.com)
with a rather high +/- of 1.5 THD and a somewhat limited bandwidth of 30Hz-15Khz.
Considering the limited bass output of the CS .5's and that they can seem a bit tippy without any treble roll off of their own, and the fact that tubes overload more gracefully. it would seem as though it should all work out. But in a room of that size you might be at the limits.
Of course, due to the small size of the CS .5's, they are not at all too cumbersome, and it wouldn't be too difficult to move on from them.
Sure, I guess it's worth a try.