A good class D power amp of same or higher power would probably fix the problem.
A cheaper thing to try beforehand might be to swap in a pair of inexpensive MIT Terminator ICs for the Monsters and see if that helps. If not, probably still a good investment down the road.
A cheaper thing to try beforehand might be to swap in a pair of inexpensive MIT Terminator ICs for the Monsters and see if that helps. If not, probably still a good investment down the road.