I don't know anything about Focal, but I do know MA are outstanding. I think you'd be better off pairing the MA with the arcam too, the warmth of the arcam offsetting the brightness of the MA's. Having said that I don't know anything abou tthat yamaha either hehe.
What you'll get with MA is cracking bass response and a very detailed, but sometimes bright sound. They also do high volume very well because of their rigid metal cones (I think this is what gives them their bass response too, able to throw those cones that much further without them distorting). Im not sure they are the best speakers for handling classical and Jazz though they will certainly rock your socks off.