two years ago I owned a pair of HX2 15's. They were rated at 600 rms a piece. At that time I didn't have very much money so I ran a MTX black & Gold series 2150 rated at 600w rms at 4ohms mono.
I was really under powering the subs bad. I had them in a sealed box with 2.5cu ft a piece. They sounded pretty good and hit real low but was not playing to full potenial do to the small amp I had.
I never heard any Ed subs in person before so I can't speak on them.