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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!
+ 1 tlinkie...The MC needles have never been accurate, and, if you think you are only using 4.5 watts, you are not cranking it as much as you might think. But, they are beautiful to look at. To answer the question. The 462 will drive anything, but, the sound of MC autoformer amps are very subjective and personal. YMMV...Enjoy ! MrD.