I have 948s. You won't go wrong with them in a decent sized room. They are really incredible in delivering undistorted bass on piano, organ, and cello, which all sound much closer to real instruments than anything else I have tried. And you need something that matches your other Focals.
I am scheming on a Hypex amp to drive them better. My 845 tube amp absolutely can't handle the load. My Loxjie A30 does better than one might expect, but there is some room for improvement. You will probably be fine with the Denon, but a powerhouse amp will be a worthwhile upgrade for them. They are sensitive but also difficult, so you need current delivery.
I am scheming on a Hypex amp to drive them better. My 845 tube amp absolutely can't handle the load. My Loxjie A30 does better than one might expect, but there is some room for improvement. You will probably be fine with the Denon, but a powerhouse amp will be a worthwhile upgrade for them. They are sensitive but also difficult, so you need current delivery.