Your method would be correct for connecting the amps to the preouts on the Denon.
Connecting speakers bare wire works fine. Terminations like banana plugs, spades and pins offer convenience and prevent the copper wire from oxidizing or creating shorts from stray wires touching other wires, but will not improve sound quality in any way.
Connecting speakers bare wire works fine. Terminations like banana plugs, spades and pins offer convenience and prevent the copper wire from oxidizing or creating shorts from stray wires touching other wires, but will not improve sound quality in any way.