I have run the Wharfedale 9.1s for a while.
I don't think you'll have any problems running the with the A1. I have run the speakers on much less power. I have even run them on a SMSL SA36Pro (20W) and while the results weren't brilliant I didn't feel like the sound was constricted by a lack of power.
Generally I think that there is too much emphasis placed on the power output of amplifiers. Even amplifiers which produce a similar output power will have differing audio output. A well known example is the classic NAD 3020. Only 20 watts per channel but louder and more impactful than some amplifiers with twice the power output.
Having said all that, I feel a little hypocritical because, I am currently using a vintage Rotel RA-971 but that's mostly to match my vintage CD transport and vintage DAC.
Enjoy the music!