Thank you, John Scalzi at Whatever.
Two mallets. The one on the right, with the brass head, is the one I use the most. The small size is very nice, though it does have some weight.
I usually hold it high, and rapidly tap the chisel. Sounds like a woodpecker. Held lower on the handle, great force can be applied, though I prefer to make light, controlled cuts. If I need to waste a lot of material, I have my electric and air powered "Beavers", here, and here. I have even used a small chain saw to waste a lot of material, as well as a circular chain saw for mounting on a grinder.