Gervais Cote
Predator
I think you'll be quite pleased with the 4140S2 on the Saras, Colin.
Power wise, this isn't far from an NAP110. Creek claimed a nominal 40W/ch (=16.0dBW) with instantaneous peak current rated to 15amps (the latter roughly the same as for NAP250).
If this can help :
I tried this amp on my vintage IMF Super Compact V1 that uses a similar woofer to the Sara (but only 1 instead of 2) and it really didn’t lack power at all. I don’t remember the efficiency of my IMF but they are not the most efficient ones. I think Creek is conservative in their power ratings as it really seemed to be more than just 40 w per channel.
Another positive point for the Creek is that the treble is very smooth (but detailed enough) so this should be a good fit with the tweeter of the Sara or any other vintage Linn speakers.