Bass extension really doesn't matter if you are using a subwoofer like he will be doing. You can compensate with a higher crossover point to the sub and carefully place the subwoofers as close to your mains as possible to avoid/minimize any localization. My advice would be to use 2 subwoofers (EP350) over a single EP500 for this purpose.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne