I have a McIntosh MC452 driving a pair of Focal Sopra No2's (91 db efficiency rating) and when I'm really cranking it in my 24 x 26' "man cave" the needles dance around the 4.5 watt mark.
I see the Ravel Salon 2's are listed as 86.4 efficiency rating, which (in theory) would consume roughly four times as much power as the Sopra's to reach the same volume level. My amp probably is able to hit musical peaks of around 700 wpc, yours should be able to do 900 wpc.
I just don't see how the MC462 wouldn't be enough power!