Buying an amp is a greatly misunderstood process, even among some audiophiles. You'll get a lot of opinions on this thread, but the best suggestions will come from those who have actually owned your model of speakers. Many years of experimentation has taught me that suggestions by those without direct experience usually amount to just speculation and questionable theory. Some combinations "should" work, but do not.
Speaker/amplifier synergy is *critical.* For example, I have owned your Marantz receiver but have never heard the F12s. Consequently, any suggestion I make about a particular amp would be theoretical at best.
It would also help people if they knew your price range and what kinds of sounds you like and don't like. Your best leads in this particular audio conundrum will come from Focal owners who have gone before you. Good luck on your search.
Speaker/amplifier synergy is *critical.* For example, I have owned your Marantz receiver but have never heard the F12s. Consequently, any suggestion I make about a particular amp would be theoretical at best.
It would also help people if they knew your price range and what kinds of sounds you like and don't like. Your best leads in this particular audio conundrum will come from Focal owners who have gone before you. Good luck on your search.