Just to put it into perspective. The receiver that you have is supposed to be giving you 160w@8ohm.. but that might be optimistic. But your speakers are really running at 4ohm, so you might be getting between 60-80w. The major limiting factor inside the receiver is the power supply. it doesn't really have a big one, and next to no capacitance to give you reserve headroom.

The ADA1000 has a large transformer and can deliver a true 250w of power to your 3 speakers all driven full range. (something I doubt the Denon could ever do). You will be running the speakers with 4x the wattage and actual current to drive them.

Now I know that the ADA1500 is much bigger. It can in 3 channel drive 500w of power. The question you need to decide on is if you really need that much?

for tjhe same cost of a 3 channel ADA1500-3 you can buy an ADA1000-3 and a pair of EP500 and that would likely give you far better sound than buying a larger amp that you might never really get full use out of, or a really big sub that you not have to find the sonic sweet spot for.

just something to think about.

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5