NAD C372 & Gallo Ref 3.1

The NAD is a good match.

Listen to your own ears and go from there.

"The Gallos should work quite well with that amp, they love a high-current amp and the strong, ballsy NAD bottom end should sound great with those speakers."

Agreed. Well put!

I've heard the NAD/Gallo Ref combo at a dealer. It sounded very good, much as described!

Does "ballsy" mean a lot of punch in a relatively small and perhaps less expensive box?

If so, I'd say many amps from NAD and Musical Fidelity and class D amps in general are ballsy. Many MF and class D amps actually do double in power like their much larger nemeses.